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Introduction:

I walked in on my sister in bed with my favourite female cousin. I never could have expected it, much less where it would lead.

I sighed as I stepped through the door, closing it behind me and stepping out of my shoes. Stupid boss, screwing up the schedule again. Normally I wouldn't mind the unexpected day off, but I could really use the cash. Ah, well. My friends were all working, like I should have been... but maybe I could convince Tammi and Kristy to come with me to the beach at the lake again today? I couldn't very well go by myself, that would just be creepy—but having them along would be camouflage, letting me stare at all the pretty girls as much as I liked.

I smiled to myself, thinking of the one girl in particular I was most anxious to see again; Tammi, in that tiny little green bikini she'd worn last time. And so what if she was my cousin? It wasn't like I was ever actually going to do anything about it—and it didn't hurt anything just to look! As long as I didn't let myself get caught, that is. Out of all our cousins, she'd always been my favourite; she was a total tomboy, after growing up on her family's farm a couple of hours south, and she'd always been way more fun to hang around with than my other girlie-girl cousins. She was Kristy's age, two years younger than me, and with her and Kristy both joining me at university in September our parents had offered to let her stay in our guest room rather than needing to pay for an apartment or stay in the dorms. My aunt and uncle had jumped at the idea, thrilled to know Tammi would still have family looking out for her during her first time living in the big, scary city. She'd moved in two weeks ago, and she, Kristy and I had been having a blast together ever since. Any time I wasn't stuck working, that is.

The music coming from Kristy's room was obnoxiously loud as I approached, but given that they were supposed to be the only ones home I couldn't really blame them. I knocked on the door, but when they didn't answer I wasn't surprised they hadn't been able to hear, and I opened it anyways.

“Hey, do you girls want...” I broke off with a gasp at what I saw, my eyes going wide. The two of them were laying completely naked on Kristy's bed, passionately making out, their hands between each other's thighs!

“Pete! No! Get out!” Kristy screamed as she saw me, reaching down in a panic to grasp at the blanket, yanking it up to cover them both. But it was too late; the image was already irrevocably seared into my brain. Tammi, tall and almost unbelievably slender, her long, tousled, fiery red hair laying sexily around her shoulders. Kristy, every bit as skinny at the waist but shorter and significantly curvier, her pale blonde pageboy with pink-dyed tips gracefully framing her face.

“God...” I sighed, my cock instantly straining to attention down the leg of my jeans. I leaned over to Kristy's desk, turning her music down to a more reasonable volume so we could hear each other speak. “You two... how long has this being going on?” I asked dumbly, slowly shaking my head in disbelief.

“You have to swear you won't tell, okay Pete!” Kristy demanded, her bright blue eyes desperate and terrified. It was strange how different she and I were, all except for our eyes. We got comments about it all the time, how we looked just like our parents had at our age; I was as tall and dark-haired as she was short and blonde, only our exactly identical eyes proving we really were related at all.

“I won't. Of course I won't,” I promised, then grinned wickedly. “Does this mean it's my turn next?” I wasn't serious—it was just a tease! I was still trying to come to grips with what I'd just seen, and humour had always been my go-to defense mechanism.

“Okay,” Tammi softly replied, the beautiful, pale skin of her cheeks blushing brilliantly as she stared up at me from her half of the bed, smiling bashfully. God, I'd always loved redheads! And Tammi herself was the primary reason for that.

“You can't be serious!” Kristy objected with a gasp, though she was no more shocked than I was. I'd just been kidding!

“Why not?” Tammi smiled back at her. “It isn't any worse doing stuff with him than it is doing it with you! And I told you, I've never done anything with a boy, before... I want to see what it's like!”

“I don't know...” Kristy said, nervously chewing her lip.

“Then it's a good thing you don't get a vote!” Tammi laughed, leaning forward to kiss her firmly on the lips. “It isn't like I'm trying to make you do it with him, too! You can just watch! But if you've really got such a problem with it, then fine; Pete and I can go to his room, instead, and you can stay here!”

“No, I... Like you said, you've never done this before. I need to make sure he doesn't hurt you, or anything,” Kristy said, quickly shaking her head. It was a flimsy and transparent excuse—of course I would never hurt her! I'm sure Tammi saw through it just as easily as I did, but neither of us was about to call her on it.

“Come here,” Tammi said, motioning me over to her side of the bed, sitting up and holding the blanket up to cover her chest. And whether I'd just been kidding or not, now that she'd actually expressed her interest there wasn't a chance in hell I was going to turn her down! I walked around to her, having to make a concerted effort not to jog and reveal my excitement. I'm pretty sure she picked up on it anyways, giggling sweetly as she put one hand on my hip, sliding slowly up under my shirt, staring expectantly up into my eyes.

I could take a hint; I stripped quickly out of my shirt, tossing it aside. She smiled appreciatively, seductively biting her lip as she looked me up and down, her soft, slender little hand slowly stroking over my abs. It was hardly the first time she'd seen me without a shirt on—but this was different. I ran my fingers through her soft, lustrous red hair, and she bit her lip, bringing her other hand up to my chest, allowing the blanket to tumble into her lap. God, she was gorgeous! Her breasts were the most perfect, firm little B-cups, just enough for me to really get a grip on, her nipples tiny little pink pencil-erasers, just begging to be sucked! I reached down to her, her eyes fluttering closed, the tiniest little hum of pleasure escaping her lips as I took the warm, firm flesh into my palm, squeezing gently.

Her hands started to move, one reaching up to squeeze my pec, the other teasing and exploring my upper and outer thigh. She took her time with it, but once she'd finally worked up the courage to move inwards, and she found what was waiting for her there, her eyes widened in shock. I don't know why she was so surprised—her gaze had been riveted on my bulge for the last several minutes, after all! But I guess actually feeling it under her hand was something else; she attacked the fastenings of my belt—that was really the only word that applied, she was in such an obvious hurry now. The zipper gave her a little trouble, but at her moan of frustration I moved to help, and she was able to pull my jeans down to my knees. I worked myself the rest of the way out of them, toeing off my socks as well, while she was still busy staring at me in my boxers, working up her courage again.

I used my other hand, the one not semi-permanently attached to her breast, to tilt up her chin. She resisted just a little, not wanting to take her eyes away... but she let me, and I leaned down to give her a soft, slow kiss on her lips.

She moaned eagerly into my mouth, one hand finding its way to the back on my neck, the other tightening her grip on my cock, gently starting to squeeze and rub. I teased carefully at her lips with my tongue, and she replied with interest, slipping her own deeply, searchingly into my mouth. We kissed long and hard, until we were both literally panting with need. And when she finally broke away, seductively licking her lips, she was done waiting.

“God!” she gasped, my thick, nine-inch cock finally springing up to meet her as she sent my boxers to the floor. Her eyes widened as she took me into her delicate little hands, one above the other and with room left to spare. Kristy was having much the same reaction, I was gratified to see—but I didn't call attention to it, didn't want to risk breaking the spell. Tammi leaned forward, giving me a soft, tentative kiss directly on the head. She wasn't really doing much yet, but still I gave her a moan, wanting to encourage her. She giggled girlishly, glancing nervously up into my eyes as I remained pressed against her lips. I smiled back as reassuringly as I knew how, lovingly stroking my fingers through her soft, silky red hair, giving her breast a somewhat tighter squeeze.

“You have to promise to tell me, if I'm doing anything wrong,” she murmured quietly, the vibration of her voice trembling pleasantly against my most sensitive spot, right on the underside of my head. “I've never done this before... you have to teach me what to do, so I can be good for you.”

“You're starting out strong,” I assured her with a grin, making her giggle again. “Just do what feels natural to you... figure out what you like to do, first, before worrying at all about what I might or might not like. I promise I'll speak up, if I need to... but more than anything right now, I just want to watch you explore, and play!”

“Okay,” she smiled shyly, and I stroked my fingers through her hair again. Then she took a deep, steadying breath, and took me into her mouth.

I moaned happily, and she giggled around my shaft, immediately making me moan yet again. She wasn't able to take me very deep—unsurprisingly so, for her first attempt—but when it comes to blowjobs I've always been a big believer in enthusiasm over technique. Not that I had enormous amounts of experience myself, mind you; I'd had a dozen or so girlfriends, of varying levels of seriousness. But I knew what I liked and what I didn't, and technical proficiency aside, my sexy little cousin was already proving herself to be solidly in the upper half just from pure eagerness alone! It felt so good, I wanted to just tilt my head back and close my eyes... but I wouldn't let myself, not when it would have meant missing out on one single second of watching her work! Best of all were her eyes, a deep and stunning green she'd inherited from the other side of her family, shining brightly up at me in obviously excitement and enjoyment of what she was doing. I moaned appreciatively, wordlessly letting her know what a good job she was doing, and she smiled happily around my shaft at the praise. As absolutely incredible as it was for me, and evidently for Tammi as well, Kristy seemed to be enjoying herself nearly as much; her hands had disappeared under her blanket, and though she was tightly biting her lip to keep herself quiet she couldn't keep the obvious blush of excitement off her cheeks. It didn't take a genius to realize what she had to be doing to herself, there under the blanket where we couldn't see.

But all of a sudden and all too soon, Tammi was pulling away! I worried that I'd done something wrong, that she'd come to her senses...

“Do you have a condom?” she shyly asked, her beautiful, pale cheeks burning an even deeper shade of red, and I swear, my brains just about dribbled out my ears!

“Uh... yeah. In my room,” I managed to choke out. Oh my God! She was really going to let me do it! My gorgeous little cousin was going to let me fuck her! “But... would you trust me to pull out, instead? I'll use one, if you want me to... but I'd really rather feel you, not a condom, if you'll let me.”

“I don't know...” she nervously bit her lip. “I'm not on birth control, mom wouldn't let me... You swear you'll pull out? And not just at the last second, either... You'll pull out early? Like, earlier than you think you need to, to be safe? I promise I'll still finish you off with my mouth, if you do.”

“I promise,” I nodded seriously. I'd have done anything she asked, if it meant she'd let me inside that gorgeous little pink pussy I'd caught barely a glimpse of earlier!

“Ummm... okay, then,” she agreed, smiling bashfully. She laid herself back in the bed, flipping the blanket aside to double-cover Kristy, baring herself completely, biting her lip and slightly opening her thighs. She was even more incredible than my tiny, stolen glimpse had led me to believe! She'd trimmed her pubes, as fiery red as the rest of her hair, into a cute, playful little heart. The rest of her was shaved perfectly smooth, or maybe even waxed, her outer lips flushed a beautiful shade of pink, still glistening wetly from when she and Kristy had been playing. But even as aroused as she obviously was, her tiny, trim inner lips were barely more than a line, her adorable little clit barely peaking out at me from under its hood.

I couldn't stop myself; even after the offer of sex I'd been dreaming about for so long, first I needed a taste! I crawled up onto the bed, bending down, laying myself between her legs. She gasped in surprise, her soft, slender thighs trembling against the sides of my head, her fingers running deeply into my hair, pulling me tight. She was utterly delectable, fresh tasting and new, like... well, I don't really know what it was like, other than pussy. There's that certain, undefinable taste all girls share; Tammi's was subtle, not at all overwhelming like some I'd tried. I dove right in, lapping it up. Her lips were so tiny, her hymen a tight little ring; I extended my tongue as deeply into her as I could reach, gently coaxing her into opening for me, preparing her as much as I could for what would come next.

“Come here!” Tammi purred, and for a moment I was confused. I guess I'd closed my eyes in enjoyment without realizing I was doing it, because as I opened them and looked upwards again I saw it was actually Kristy she'd been speaking to, not me. My sister was nervously biting her lip... but Tammi reached over with her hand, running it through her hair, drawing her closer; she was no more able to resist than I would have been. Tammi drew her out from under her blanket, Kristy's huge, soft DD-cup tits coming to press firmly up against Tammi's side as the two of them started to kiss. Tammi twisted slightly to her side to meet her, as they began fondling each other's breasts.

I moaned lustily into Tammi's folds, my cock throbbing hard against the bed as I stared up at them, my younger sister and my favourite little cousin, voraciously mauling at each other's tits and shoving their tongues down each other's throats! My hands were on Tammi's hips, holding her firmly in place as she writhed herself helplessly against my face. So when Kristi moved in tighter, seeking to rub herself against Tammi's side, it was the back of my hand she got, instead. She gasped in surprise, jerking herself back, glancing down at me in apology and shame. But as I smiled reassuringly back at her, nodding encouragingly... she blushed nervously, but slowly moved back in and started to rub against me once again. And a few minutes later, when I withdrew my hand from between them and started tentatively fingering her between her soft, meaty little lips, instead... her only response was to moan and lift her upper leg, welcoming me inside.

As much as I was looking forward to what I knew would be coming next, I was enjoying myself so much I was in no sort of hurry. From the look on her face, I'm pretty sure Tammi was feeling the exact same way... but her body definitely had other plans. She suddenly gasped, her eyes going wide with shock, her thighs starting to tremble. She had to have known what was going to happen, where what we were doing was going to lead... but it was clear she hadn't been expecting it so quickly, or for it to hit her nearly so hard when it did. She started to squeal, her eyes pinching shut, writhing on the bed, her legs fluttering uselessly in the air. I just held on for dear life, withdrawing my fingers from my sister's pussy so I could reestablish a firmer grip on Tammi's hips, slathering her cute little pleasure button with my tongue, carrying her all the way through. On and on she wailed, until finally she collapsed against the bed, her hands flailing to push me away from her, unable to stand the sensitivity. I chuckled and allowed her to succeed, softly kissing the inner junction of her thigh, instead.

“That looked like a good one,” Kristy giggled, leaning in again and softly kissing her cheek.

“Uh hunh!” Tammi agreed wholeheartedly, her eyes partially hooded, sexy, and very, very satisfied. “I'm not even sure exactly what he was doing down there... And don't take this wrong, or anything, you're good, too! But next time I let him do that to me, you need to get down there and watch, so you can take notes!”

“Will do!” Kristy laughed, and as she looked down at me again she blushed. Neither of us had acknowledged it out loud, yet, but I could hardly wait for the chance to show off my technique for her, as well—and in person, between her thighs, not just letting her watch! For the moment, however, I had other priorities; as Tammi bit her lip, beckoning me up the bed with her finger, I was only too happy to oblige.

We started with a kiss, deep and passionate, as I laid myself on top of her, careful to support most—but not quite all—of my own weight. She moaned eagerly into my lips, lifting her knees and spreading her thighs. I stroked my fingers through her hair, and she started rocking her hips, rubbing her soft, wet little lips against the underside of my shaft, then reaching down. I backed away a little, letting her be the one to angle me into place—but just as I was about to push, Kristy's hand was on my hip.

“Be careful!” she cautioned. “Remember... she's never had anything bigger than my fingers, before now, and you're really, really big! If you go too fast and hurt her, it means neither of us will get to have her again until she's all healed up!”

“I'll be gentle,” I softly promised them both, though at the moment my attention was only for my cousin, her gorgeous green eyes staring up into my own from below. She was clearly nervous, there was no denying that—but she was excited, too, just like I was. “You just make sure you say something right away, if it ever starts to be too much. A little bit of pain is probably inevitable, you're just so tiny, and tight... but like she said; if you let me hurt you, just because you're trying to be tough, it means neither of us will be able to touch you at all down there, for several days at least. It's always better to tell me to slow down, or stop, if you need me to; I promise I won't mind! And if you can't bring yourself to say it out loud, for whatever reason, then using your hands on my hips, or chest, or whatever else you can reach works just as well.”

“Okay,” she agreed, smiling shyly. She turned to Kristy, giving her a reassuring nod, and my sister slowly withdrew her hand from my hip. I leaned down to give Tammi one more soft and loving kiss, and as she moaned into my lips I gently started to push.

She gasped, trembling a little, but as I backed away from our kiss to look her in her eyes I could tell it was more from surprise at how it felt than from any actual pain. Still I was careful, taking my time, moving ever so slightly in and out, stretching her gradually.

“Let me help with that,” Kristy offered, reaching in between us. She wrapped one hand around my shaft, maintaining the proper angle, using the fingers of the other to gently spread Tammi's lips for her. My own baby sister, holding my cock... but somehow, with everything that was already happening, it just felt natural. More than that, it felt right! “You put your hands on his hips, to help show him how much you're ready to take.”

Tammi was a little short of breath at the moment, but she nodded her agreement and did as Kristy said. It was the strangest feeling having her guide me like that, almost like she was using my cock as sex toy—and even more so with Kristy still holding onto me the way she was—but it was clearly helping Tammi adjust, more than if I'd just been having to guess, so I was all for it. It still took a good long while, but finally my entire head was able to slip inside with what felt like it should have been an audible 'pop'. The only actual sound was Tammi's gasp, as her hands tightened on my hips, Kristy finally able to withdraw her hands.

“You okay?” I had to ask, wincing in sympathy.

“Just give me a minute,” she breathed. “Maybe if you kiss me some more? That was helping me relax.”

I started slowly, my lips barely brushing against hers, teasing more than kissing. She moaned, straining upwards for more, which I only gradually provided. The distraction worked; before she'd realized what she was doing she'd started gently rocking her hips, the slow, sensuous movement gradually helping her open to me. I started thrusting a little, not even trying to go deeper yet, but when that met with an enthusiastic moan I cautiously started giving her a little bit more. It was only a fraction of an inch at a time, but it was working. My concentration was so complete, the sudden, trembling moan from beside me took me completely by surprise, Tammi and I both glancing over in shock.

“What?” Kristy demanded defensively, one hand squelching rapidly between her thighs, the fingers of the other digging deep furrows into the flesh of her huge, soft breast. “You guys are fucking hot together! You don't really expect me to just lay here watching and not get myself off to you, do you?”

Tammi and I laughed as one, shaking our heads and resuming our kiss. Ever slowly deeper I worked my way inside, intent to every little whimper and fragment of a moan. I had to fight against my instincts, screaming at me to take her faster, harder. But at least I had the experience to know better; Tammi didn't, and it wasn't long before her hands moved from my hips to my ass, grasping tight and trying to yank me deeper on every thrust, when her searing tightness was telling me in no uncertain terms that she still wasn't ready. I was literally trembling with frustrated desire... but I couldn't, wouldn't, let myself do that to her. I forced myself to go slow, to be patient, even when she crossed her ankles at the small of my back, mewling desperately for more. Little by little... regardless of what she wanted in the moment, that was what she needed. She was giving me her most precious gift, and I owed it to her to accept it properly—I could only trust that she would forgive me afterwards for making her wait.

It felt like it had taken half of forever, but finally Tammi and I got it done; all nine inches, ensconced tightly inside her tiny, gripping little pussy. She gasped as she felt me pressing against her lips; I grinned, nodding, and lifted myself enough that she could stare down our bodies to see.

“Peeete!” she squealed my name and started to thrash, her eyes wide and terrified, the orgasm having snuck up on her out of nowhere, triggered without warning by the sudden realization that she was actually taking the entire thing! I'd had no more notice than she did, but I reacted by instinct, collapsing back onto her chest and holding her down tight, burying my face against her slender, delicate neck, my hips pistoning hard and fast, driving desperately into her depths. And then another squeal, beside me—I turned my head to see Kristy was cumming too, sent careening over the edge in some sort of sympathetic response, staring straight into her own brother's eyes as the orgasm took her. Tammi wailed and fought beneath me, biting my shoulder, her nails clawing at my back. But I couldn't relent... not until she finally lay back spent and exhausted onto the bed. Only then could I slacken my thrusting, and trust her enough to raise my head.

“Fuck me, Pete!” Tammi purred beneath me, her gaze, her voice, every bit of her virtually oozing sex and need! “I need it! I need your big fucking cock! Take me! Fuck me hard!”

“Yes, ma'am,” I grinned, my voice unintentionally low and growly in my ears. In the girls' ears too, it would seem, as they both let loose with adorable little shudders of desire at the sound. I stared deeply into Tammi's eyes as I started fucking her again, deep, fast, and hard, just like she wanted. She mewled and panted, reflexively shaking her head as if in denial of what she was feeling, but throughout it all her eyes remained laser-focused on mine. I spared a moment for self examination, knowing the feeling of her cumming on my cock had sped me along quite a bit. But I was still doing okay, I decided. I'd have to pay attention, but at least for the moment I could keep doing her the way I was without worrying about blasting off prematurely and violating my promise. That was something I absolutely could not let myself do... no matter how much my cousin's tight, hot, pulsating little cunny was begging me to do precisely that!

My God, was she ever a good little fuck! If it had been any easier getting myself inside, I never would have believed it was her first time. She was instinctively, perfectly rolling her hips to meet me, making the most adorable little whimpers and gasps on every thrust of my cock. But more than anything it was her eyes; those deep, gorgeous emerald pools, drawing me in as if to drown me in her need. She soon had me re-evaluating my assessment; I wanted to make her cum one more time first, before I would pull out... but she was just so incredible, she was going to make it close!

Kristy saved me. She was still going at herself like a fiend watching the two of us fuck, and this time the roles were reversed; Kristy's screaming orgasmic howl was more than Tammi could take, and she joined right on in with her nearly on her heels. I was really, really cutting it close now, more so than I'd ever intended... but I just couldn't stop, not right in the middle of her orgasm like that, not until she'd finished. I used every trick I knew to delay, but I was still gasping with relief the moment Tammi collapsed back against the bed, immediately pulling out and crawling up to her straddle her shoulders. I slipped my left hand into the hair at the back of her head, lifting her up to meet me as I impatiently shoved my cockhead into her mouth, and rapidly started stroking my thick, pussy-soaked shaft with my right.

“Mmph!” Tammi gasped in surprise, her eyes widening—but then she smiled around my shaft, moaning happily and sucking hard, grabbing my ass with both hands, holding me in place.

“Oh, fuck!” I growled. “Fuck!” as I lost the last shred of my control, my hips jerking wildly as I unloaded jet after jet of hot, thick cum into my cousin's beautiful sucking mouth. She choked a little as the first blast hit the back of her throat, too inexperienced to know what to expect and guard against it. But then she started to giggle, smiling wide as she happily, greedily took the rest.

I wavered on my knees, unable to keep myself from closing my eyes against the sheer, indescribable pleasure of her soft, sucking lips and slowly swirling tongue on my overly-sensitive head. I had to pull away, I had no choice! I did so with a gasp, catching myself with a hand against the wall above her head, and she let out an adorable, proud little giggle at what she'd just made me do. She let go of my ass and moved to prop herself up, staring straight up into my eyes again as she opened her mouth and stuck out her tongue, displaying her well-earned prize. But I'd barely had a moment to enjoy the sight of her like that before she'd sucked it back in, swallowing eagerly, then sticking it right back out again to prove what she'd done.

Kristy was faster off the mark, beating me to a long, passionate kiss moments before I could lean down to do the same. But then she withdrew, scurrying rapidly down the bed and plopping herself between Tammi's thighs, going right to work on her other set of lips. She gasped and squirmed, not ready for the renewed attention, but Kristy wasn't taking no for an answer. They compromised with a change of positions, Tammi at least getting to lay herself back down first, as I moved into place beside her and I finally got my proper kiss.

“That was amazing!” she murmured against my lips, running her fingers slowly through my hair.

“For me, too!” I assured her, gently squeezing her breast.

“You really mean that?” she shyly averted her eyes. “You aren't just saying that?” I lifted my hand and put my finger to her chin, turning her back to look at me.

“You are the best I've ever had, Tams,” I told her seriously. “It isn't even close!”

“Yay, me!” she squealed and giggled, blushing sweetly. “I could say the same, you know... but it probably doesn't mean as much, considering that I was still a virgin before you.”

“Hey! I'm right here, you know!” Kristy objected, but I could tell from her tone that she was just being playful, not serious.

“That's not the same!” Tammi laughed. “Sorry, Kris... but unless your tongue is going to grow another eight inches or so and swell to the thickness of my wrist, you just can't compete in the same league!”

“Fair enough,” she laughed, too. “Just as long as I still get to go down on you, after he's done!”

“Always!” Tammi moaned breathlessly at something Kristy had just done between her thighs, her hand flailing blindly down to grasp at my softening and still-slippery cock as we resumed what turned into a long and languid kiss.

We weren't making any particular effort at it, but between our kissing, Tammi's hand on my cock, and the sounds both girls were making as Kristy devoured her pussy, it didn't take long for me to hurry through my recovery period and to be well on my way to full hardness once more. But though Tammi was now insistently stroking my cock, her kisses taking on a frenetic note of need, Kristy wasn't about to give up her claim; the long, slow make-out session she'd been holding with Tammi's pussy was nearing its conclusion, but she wasn't quite there yet. I didn't mind. Truth be told, I was getting nearly as much enjoyment just from watching them together as I had from actually eating her out myself!

We had to stop kissing as Tammi's orgasm was threatening to burst, simply out of fear for our tongues. But I still held her tight as it happened, caressing her breast, murmuring to her how sexy she was, how much I loved watching her cum. I was just on the point of asking her for another go, or maybe seeing if she wanted to try riding me this time, when Kristy surprised me yet again, crawling her knees up under herself, turning to look at me over Tammi's thigh.

“My turn next, big brother? And I do mean big, big brother!” she grinned, seductively wiggling herself in the air, lasciviously licking her lips as she stared lustily at my cock. I gasped, turning to look back at Tammi in shock... but she was just biting her lip, so much obvious excitement behind her eyes at the idea that I didn't even need to see her subtle, shy little nod to know what she wanted me to do. I kissed her first, deep and hard, then pushed myself up and moved into place.

“Be careful at first, okay?” Kristy asked, twisting to look at me over her shoulder, equal parts excitement and nervousness in her eyes. “I may not be a virgin, like Tammi was... but you're still way bigger than any boy I've ever had before. But... once we both know I can take it, I want you to give it to me as hard as you can, just like you did it to her! Only... I'm on birth control. So warn me first when it's time, so I know it's coming... but I want you to fill me up with your cum!”

“Anything my baby sister wants...” I chuckled, taking the opportunity to deliver a swift, stinging slap to her ass, making her yelp.

“Hey!” she objected, then giggled bashfully, her cheeks blushing nearly as brightly as Tammi's could. “I only like spankings when you're already fucking me, first!”

“Good to know!” I laughed in surprise at her admission, leaning down and softly, slowly pressing my lips right where I'd struck her, kissing it better. She giggled again, shimmying herself beneath me, and I rose back to my knees. I took my cock in hand, rubbing up and down along her lips, so much thicker and meatier than Tammi's were, but every bit as beautiful in their own way. She moaned, laying her head on Tammi's thigh and closing her eyes, widening the stance of her knees. I pushed in carefully, cautiously. She was still pleasantly tight, quite a bit more so than most of my girlfriends had been, even, but not so much that I had to be inordinately careful like I had with Tammi. I put my hands on her ass, squeezing tightly into the warm, firm flesh, as I gently started to thrust my way deeper. I met eyes with Tammi over Kristy's back, watching her licking her lips as she watched me in turn, seeing me driving my thick, hard cock deeper and deeper up my own baby sister's needy little snatch. There was no doubt in those magnificent green eyes, no worry, or restraint. She wanted this every bit as much as I did, one hand stroking softly through Kristy's hair at her lap, the other vigorously squeezing her own breast for me as I watched.

And speaking of breasts... I would never forgive myself if I let an opportunity like this pass me by. I slid my hands from my sister's ass, over her wide, curvaceous hips, up along her slender little waist, under her chest. People talk about girls having an hourglass figure sometimes, but I'd never met a girl who embodied that concept better than my own dear, sexy little baby sister. Kristy moaned in pleasure as she felt me gripping her, those amazing double-D tits so heavy and hot in my hands, the thick, succulent buds of her nipples fully erect and pressing firmly into my palms. I squeezed her tighter, using them like handles as I started giving her a little more power, a little more speed. I wasn't all the way inside yet, but she responded enthusiastically, pushing herself back in time with my thrusts, gasping adorably as she forced herself further and further onto her own brother's thick and straining cock. That earned her another spank, of approval this time, and she whimpered happily at the follow-up squeeze I gave her newly-sensitive flesh before returning my hand to her breast.

She was so wet, so eager, I figured it was safe to try giving her the last inch all at once. I pushed in hard, grinding against her ass, as she arched her back and squealed. The penetration itself wasn't quite enough to finish her off, the way it had been for Tammi, but I could tell it had taken her right to the edge. She was so close, in fact, that on a whim I decided to try something new.

“Cum for me, you little slut!” I demanded, spanking her hard. “Make that tight little pussy cream all over your big brother's cock!”

She gasped, her eyes widening in shock as she twisted back to look me in my eyes, launching into a squeal as her thighs started to tremble. Hot damn, it had actually worked! I had to put my hands back on her hips, holding on tight as she reflexively tried to escape. Like that was going to happen! I pounded her hard and fast, giving her everything I had, wanting her orgasm to be as intense and long as I could make it. She screamed and shook her head in denial, wordlessly begging me to relent—but that was one request I knew better than to grant, however she felt about it in the moment. She finally came down again, an enormous, satisfied smile on her lips as she rested her cheek on Tammi's thigh, and I slowed slightly to a more sustainable pace with my thrusts.

“Break time's over, you little slut!” Tammi suddenly giggled. “Now that he's made you cum, I expect that pretty little mouth of yours back on my pussy where it belongs!”

“Yes, mistress!” Kristy purred submissively, bending her head between Tammi's long, slender thighs and eagerly starting to lick.

'Mistress', was it? I grinned. Well now, that was unexpected! There was so much about the two of them I was going to have to make it a point to learn... but questions could wait. For the moment, my sister's hot, tight little body was my only focus of attention. And now that she was no longer trying to buck herself off the end of my dick, it meant I could move my hands back to those huge, luscious tits of hers once again!

Kristy came quite a bit quicker for her second time around, but other than the speed at which it arrived, and the fact that she was able to bring Tammi along with her when it happened, it was almost identical to her last. On the approach to her third, however... that's where things got interesting. I was getting really close, and I wasn't sure which of us was going to end up breaking first. But I guess Tammi must have seen it in my eyes, because that was when she decided to arrange matters herself.

“Don't you dare cum before Daddy does, you naughty little whore!” Tammi demanded. 'Daddy'? That was even more of a surprise than the whole 'mistress' thing! And from the way Kristy's head suddenly jerked up from between Tammi's thighs, she hadn't been expecting it either. But I had to admit... I kinda liked the sound of it! I grinned down at her wickedly, seeing her blush in response, unsure if she'd just made a mistake... but I gave her a wink, letting her know I approved, and she smiled more confidently. “No cumming for you!” she continued. “Not until you feel Daddy's big, hot load bursting inside that slutty little pussy!”

“I won't, mistress!” Kristy whimpered piteously. “I promise I won't!”

“Good girl!” Tammi purred with approval. “Now... tell Daddy what you want!”

“I want you to cum in me, Daddy!” Kristy wailed, wiggling herself on my cock, the movement of it inside her making her moan even more than it did me. “Give it to me, please! I need it so bad!”

“Is that so?” I grinned, giving her a nice, hard swat on her ass, making her squeal. Her thighs started to shake—she wasn't cumming, not quite yet, but she was right on the edge now, mewling with the effort of holding back. “You want to milk your big brother's cock with your tight, juicy little hole? You want me to breed this dirty little cunt?”

“Please!” she wailed even louder, her eyes going wide as she twisted to look into my own, obviously shocked that I was taking it that far, using those words. “Please!” Her whole body started to shake, her eyes clenching closed with concentration. I was so, so close... I returned my hands to her hips, holding on tight, and started giving her everything I had.

“Oh, take it!” I growled as the pressure finally burst, my cock pulsing inside her as the first, powerful jet shot forth. My hips took on a life of their own, ramming it in hard and deep in time with every shot. “Take it, you little whore! Take your big brother's cum!”

“Daddyyy!” Kristy squealed beneath me, her eyes flying open once more as she was finally able to let herself go. She clawed at the sheet, reflexively fighting to get away from the unbelievable intensity of what I was making her feel... but I would have fallen down dead before I'd have let her out of my grip! Jet after jet I came in her; filling her up, claiming her, making her my own! She whimpered and gasped, the trembling shocks of it still coursing through her long after I'd given her my last.

I patted her on her ass, gentle this time, an acknowledgement of a job well and thoroughly done while I wasn't yet able to speak. She smiled back at me, panting and exhausted—then pushed herself forward, pulling off of me in the process and collapsing onto Tammi's chest. Tammi squealed and giggled, wrapping her arms around Kristy's neck and frenetically delivering the sleepily requested kiss. But then she was squirming out from beneath her, hurrying down the bed and rolling Kristy to her back, leaning down to greedily kiss her other set of lips instead.

Kristy moaned, trembling and closing her eyes again, but obediently spreading her thighs. It was an opportunity I couldn't resist; I crawled slowly up the bed beside her head, showing my cum-covered cockhead directly into her mouth before she'd even registered I was there.

“You like that, you little slut?” I demanded as her eyes flashed open in surprise. “You like tasting yourself on your brother's cock?”

“Mmhmm!” she nodded vigorously, moaning around my shaft. I did, too; I'd given myself a little bit of a rest, while they'd been kissing, but I was still quite sensitive, and it felt amazing having her swirling around my crown with her tongue.

“Try to squeeze some out!” Tammi murmured from further down the bed. “I want to taste him in you!”

“I'm already trying,” Kristy popped me out of her mouth with a giggle. “But he's really, really big... he came so deep up inside there, I'm pretty sure most of it just went straight up into my womb! And any that did, won't be coming out again any time soon!”

Tammi giggled too, nodding her understanding; she didn't seem too upset about it, happily licking up Kristy's mess, even if she obviously would have preferred having mine added to the mix. Kristy went back to work, slowly licking her way up and down my length, eagerly lapping up as much of her own creamy white juices as she could. She even sucked my big, heavy balls fully inside of her mouth, one after the other, making me gasp and close my eyes as she purred appreciatively at the taste.

Once thoroughly cleaned, I couldn't help but lay down beside her and pull her into a deep and passionate kiss. She gasped in surprise, trying to pull away—I'm not sure why, kissing was hardly any worse than anything we'd already done!—but I held her in place, and after a few seconds she gave in and melted into my embrace, our tongues dancing together as I fondled her breast, and she reached down to take hold of my softening cock.

“You're a good kisser,” she purred sleepily against my lips. “You kiss almost as good as you fuck!”

“You, too!” I chuckled, giving her an extra-tight squeeze of my hand on her tit, making her gasp. We kept making out until Tammi had finished between her thighs, gifting her a softer, slower, and more languid orgasm than any she'd had with me. Then Tammi crawled up the bed and we adjusted our positions, with me in the middle and the girls snuggling tightly up against my sides, each with a leg throw negligently over my own, their cheeks nuzzling softly on my chest.

“You girls are incredible, you know that?” I sighed happily, holding them close under my arms, running my hands up and down their sides and softly kissing them in their hair.

“You, too!” they echoed in synch, giggling at the unintentional jinx.

“You've really got to give me the number of your doctor,” Tammi smiled across my chest. “That looked way too much fun, having him cumming in you like that! I need to get myself on birth control ASAP!”

“Or you could just not...” Kristy wickedly grinned. “And let him breed that pretty little pussy for real!”

“You can't be serious!” she gasped, eyes and mouth wide. I was no less shocked by the idea... but then she blushed, averting her eyes down my chest and smiling guiltily. My God... she couldn't really be thinking about it, could she?

“Even if I could maybe be okay with the idea, just for myself...” she almost whispered, her cheeks rapidly growing pinker than I think I'd ever seen. “Mom would have kittens, when she found out! And Pete being family or not... Dad would still be right up here with a shotgun, if I ever wound up preggers without being married, first!”

“I can think of worse fates,” I murmured, and she gasped and jerked her head up to meet my eyes. “Lots of people have married their first cousins, you know. Albert Einstein, Charles Darwin, Edgar Allen Poe, H.G. Wells, Johann Sebastian Bach, Jesse James... And once we start talking European royalty, it might be easier to list the ones who didn't marry their cousins! We could be in worse company,” I smiled down at her reassuringly, and gave her a squeeze under my arm.

She took a moment, searching my eyes, then wryly grinned. “And you just had those names ready on the tip of your tongue, did you?”

“Well...” I smiled guiltily back down at her. “Just because I never expected anything to actually happen, doesn't mean I haven't fantasized about it a time or two. I may have looked up a few examples, just to make myself feel better about the idea.”

“Is that so?” she giggled, stretching upwards for a soft, slow kiss on the lips before settling back against my chest.

“And... what about me?” Kristy shyly chimed in as well, nervously chewing her lip. “You have examples of brothers marrying their sisters, too?”

“Not recent ones,” I replied, shocked that she was even asking, trying to buy myself time to think. “But, uh... the ancient Egyptians, I guess. They rather famously believed that the only bride fit for a king of Egypt was a queen of Egypt, so the pharaohs were marrying their siblings all the time. And they ruled the biggest, most advanced culture on earth for something like three thousand years, so they can't have been all wrong.”

“Doesn't matter anyways...” Tammi playfully spoke up. “I'm calling dibs!”

“You can't call dibs!” Kristy gasped, affronted. “He's my brother! He's only your cousin! If anyone gets to call dibs, it should be me!”

“Too bad, I already did!” Tammi giggled again, shaking her head. “Besides, you can't marry him, it's illegal! He can still fuck you... we both will! But I'm the one who gets to have the ring!”

“Well... I guess I can be okay with that,” Kristy allowed, giggling as well, then turning her head to look up at me. “Though I guess we really should ask how you're feeling about the idea, hunh?”

“Well...” I grinned. “Before I learned Tammi was going to be moving in, I had been considering getting a place of my own, up near the university, so I could have some actual privacy for a change, and wouldn't need to commute so far back and forth on the train every day. I don't see any reason I couldn't get a place that's a little bit bigger... say, three bedrooms? And of course I'd need to splurge a little bit, and get myself a nice, big king-size bed.”

“Yeah?” Tammi asked, her eyes glinting excitedly, as were Kristy's.

“It'll depend on whether we can get some help with the rent, of course,” I said, tempering expectations. “But I'm pretty sure we can get our parents to go along, as long as we come at it right. How about yours?”

“Yeah, I think so,” she said, nervously biting her lip, but growing more confident the more she thought about it. “Yeah, I'm pretty sure that could work.”

“I'm afraid you are going to have to make that appointment with Kristy's doctor, though,” I smiled just a little big regretfully. “As much as I love the idea... I need to graduate, and get a proper job first, before we can start thinking about kids. And there is no way in hell I'm going two whole years without being able to cum inside that gorgeous little pussy!”

“Well... I suppose that's fair enough,” Tammi laughed, reaching down to take hold of my softened cock, and gently starting to stroke. “And you can still be our 'Daddy', even if we have to wait a while before we can make you one for real. But in the mean time... we still have hours, before your mom and dad will be getting home from work. How long do you think, before you'll be ready to go again?”

“One way to find out!” I laughed, reaching down to give them both swift smacks on the ass, making them squeal, then grabbing hold and pulling them up towards me on the bed. They stretched giggling towards my mouth, and we started taking turns in a three-way kiss, my sister's delicate little hand eagerly joining my cousin's on my cock, working seamlessly together to get me hard for them once more.

I never could have expected anything like this to happen... and I knew that it wouldn't be easy, that there were bound to be bumps on the road, especially when we'd eventually have to decide it was time for the rest of our family to find out. But we could make it work, I just knew we could! The sex might be a new development... but I'd loved them, both of them, my entire life. What better foundation for a relationship could there possibly be, than a love like the one we already shared?

And as my sweet, slender little cousin Tammi rolled herself up on top of me, pushing herself upwards with her hands gripping my pecs and rubbing her soft, wet little pussy lips against my cock to finish getting me hard, my beautiful sister Kristy moving into place behind her, squashing her tits against her back and wrapping her in her arms, nuzzling the crook of her neck as she began fondling her perky little breasts for me as I watched... that was when I knew for sure. There was nothing, absolutely nothing, that I would not do for them! I was going to make them mine, both of them, forever... and there was nothing on God's green earth that the three of us together would ever allow to stand in our way!

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