sexstories.com
Less Read Sex Stories
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LOVE TRAIN by Hardrive
Rated 94.5%, Read 119043 times, Posted Wed 29th of February 2012
Fiction , Oral Sex, Reluctance, Romance, Teen Male / Female, Virginity, Voyeurism, Young -
My MILF neighbor by Cc2811
Rated 92%, Read 119085 times, Posted Thu 11th of August 2011
Fantasy -
My Daughter's Dating Problem by XXX Stories
Rated 84.5%, Read 119107 times, Posted Fri 21st of July 2006
Fantasm , Domination/submission, Interracial, Male / Older Female, Voyeurism, Wife -
Aftermath_(1) by davidson_tom
Rated 94.5%, Read 119151 times, Posted Fri 13th of December 2013
True Story , School, Teen Male/Teen Female -
Going south by boblink10
Rated 95.1%, Read 119178 times, Posted Sun 31st of March 2013
Fiction , Consensual Sex, First Time, Male/Teen Female, Virginity, Young -
In Riley's Arms: Part 1 by SerendipitousSoul
Rated 95.1%, Read 119190 times, Posted Thu 22nd of September 2011
Fiction , Male/Teen Female, Non-Erotic, Romance, Teen, Teen Male/Teen Female, Written by women -
My Bi-Curious Adventures - Part 5 by justaguy999
«A married lifelong heterosexual man gives in to his bi-curious fantasies.»
Rated 100%, Read 119202 times, Posted Sat 13th of June 2026
Fiction , Bi-sexual, Blowjob, Cum Swallowing, Oral Sex, Threesome -
Bug control: Evolution by Homealone_447
Rated 91.8%, Read 119217 times, Posted Thu 4th of September 2014
Science-Fiction , Alien, Anal, Group Sex, Hardcore, Lesbian, Mind Control, Monster, Oral Sex, Pregnant, Threesome -
Blackmailed By My Teenaged Daughter_(0) by PO469
«My daughter has a sleepover with her friends and I wind up getting blackmailed and it is the best thing that ever happened to me.»
Rated 87.3%, Read 119313 times, Posted Tue 6th of October 2015
Fiction , Coercion, Consensual Sex, Group Sex, Male / Females, Older Male / Female, Oral Sex, Teen -
The Trucker's Load Pt. 2 by Phoenix Cinders
«The ride continues & Alex continues to get his butt pounded»
Rated 94.1%, Read 119346 times, Posted Tue 26th of November 2019
Science-Fiction , Anal, Ass to mouth, Black, Blowjob, Boy, Consensual Sex, Oral Sex, Romance, Teen, Transgendered, Transsexual -
Trish gets a job and more!!! by Barton69
Rated 91.4%, Read 119358 times, Posted Wed 26th of November 2008
True Story , Anal, Ass to mouth, Drug, Fisting, Group Sex, Job/Place-of-work -
A Boy and his Genie - Chapter 08 by DragoTime
«Synopsis is a funny word, isn't it?»
Rated 92.1%, Read 119388 times, Posted Tue 26th of May 2015
Fantasy , Blowjob, Consensual Sex, Cruelty, Female Domination, Male / Female Teens, Mind Control, Oral Sex, School -
Personals Slave by druidtx001
Rated 92.7%, Read 119421 times, Posted Mon 4th of February 2013
Fantasm , Anal, BDSM, Domination/submission, Male Male/Teen Female, Male/Female, Oral Sex, Spanking -
Forced To Fuck One Of My Students by fbailey
Rated 79.1%, Read 119499 times, Posted Thu 9th of July 2009
Fiction , Coercion, Consensual Sex, Domination/submission, Job/Place-of-work, School, Teen Male / Female -
Trying Something New_(0) by wantsomefun
Rated 89.4%, Read 119511 times, Posted Thu 16th of February 2012
Fiction , Bi-sexual, Blowjob, Body modification, Cheating, Consensual Sex, Cum Swallowing, Exhibitionism, Group Sex, Hardcore, Interracial, Job/Place-of-work, Threesome, Voyeurism -
A Road Trip with My Grand Daughter-Part III by 2stfauther
Rated 96%, Read 119520 times, Posted Thu 19th of August 2010
Fiction , Male/Teen Female, Oral Sex -
Future Harry Potter Adventures: Chapter 1 - The Beginning by lad91
Rated 81.5%, Read 119541 times, Posted Fri 30th of December 2011
Fantasy , Anal, Ass to pussy, Blowjob, Consensual Sex, Cum Swallowing, Fan fiction, Group Sex, Hardcore, Lactation, Masturbation, Oral Sex, Spanking, Teen, Teen Male/Teen Females, Threesome, Young -
Incessantly Incestant Son by Oediplex
Rated 91.4%, Read 119556 times, Posted Thu 10th of June 2010
Fiction -
Sara's Protective Dad part 2 by Hard93
Rated 84.6%, Read 119574 times, Posted Sun 12th of February 2012
Fiction , Male/Teen Female, Romance, Virginity -
Me and Dale by Frodov
«Coming of age story, two teens discovering each other and more.»
Rated 94.2%, Read 119607 times, Posted Sun 12th of April 2020
Diary -
Jesse's Sister by Professor Peterson
«An airport layover passes quickly when Jesse's younger sister catches up with her sister's Professor.»
Rated 94.4%, Read 119607 times, Posted Sat 16th of November 2019
True Story , Anal, Consensual Sex, Exhibitionism, Older Male / Female -
Denny?s Breakfast Treat - 2 by oldman6976
Rated 95.3%, Read 119637 times, Posted Thu 5th of April 2012
Fantasy , Anal, Blowjob, Male / Females, Male Domination -
Silent Submission by Thirstbuster
«a straight friend relationship dramatically changes.»
Rated 91.5%, Read 119703 times, Posted Wed 27th of October 2010
Fantasy , Blowjob, Coercion, Domination/submission, Teen Male / Teen Male -
My first Time_(61) by faithhhxoxo
Rated 86.7%, Read 119721 times, Posted Sun 16th of August 2009
True Story , Anal, Blowjob, Cum Swallowing, Teen Male/Teen Female, Virginity, Written by women, Young -
Honeymoon Cruise of Briana and Uncle Jake <part 2> by Germannuts
Rated 95.6%, Read 119727 times, Posted Sun 8th of December 2013
Fiction , Consensual Sex, Erotica, Exhibitionism, Female / Girl, Female exhibitionist, Hardcore, Male/Female, Older Male / Female, Pregnant, Romance, Teen, Young -
Mom makes a deal part 4 by Godking1992
«Mom feels ashamed»
Rated 97%, Read 119736 times, Posted Thu 28th of September 2017
Fiction -
An Unexpected Late Night Encounter With The Girl Next Door by Larten21
«A young man moves into a new house and when relaxing on the roof meets one of his new neighbours.»
Rated 96.6%, Read 119763 times, Posted Sun 6th of June 2021
Fantasy , Consensual Sex, Erotica, Hardcore, Male/Teen Female -
Harry Potter and the Spellbook of Desires - Chapter 23 - Malfoy's Loony Line of Work by Avatrek
Rated 90%, Read 119790 times, Posted Sun 17th of May 2009
Fantasy , Blowjob, Coercion, Consensual Sex, Fan fiction, First Time, Hardcore, Masturbation, Mind Control, Oral Sex, Pregnant, Prostitution, School, Spanking, Teen Male/Teen Female, Virginity, Voyeurism -
My First Time With My Best Friend's Mom by Loupy
«A young man find's his best friend's mother home alone, drinking and suntanning out by their pool.»
Rated 90.5%, Read 119826 times, Posted Sun 2nd of February 2025
Fiction , Anal, Blowjob, Consensual Sex, First Time, Hardcore, Teen, Teen Male / Female, Virginity, Young -
the glory hole part 2 by Jill/21/f
Rated 94.6%, Read 119868 times, Posted Sat 18th of January 2014
True Story , Blowjob, Cum Swallowing, Older Male / Female, Young -
The Pressure Relieving Boy by SummersunSon
«When I was a little bitty boy, a skinny nerd, I started doing secret stuff with my rich stepdad, to ensure that me and Mom would get to keep living in his house, and so that I could hold onto all the nice things he had bought for me.»
Rated 93%, Read 119874 times, Posted Thu 4th of July 2019
True Story , Anal, Blowjob, Boy, First Time, Gay, Group Sex, Young -
Protective husband four loves part five by Hard93
Rated 95.3%, Read 119886 times, Posted Thu 3rd of May 2012
Fiction , Consensual Sex, Group Sex, Male / Female Teens, Male / Females, Pregnant, Romance -
Late Night Movie With Mum_(1) by Straight Lit
«After what had been some subtle flirting between one another Alex and his mother finally took the plunge with one another.»
Rated 95%, Read 119889 times, Posted Thu 20th of June 2019
Fantasy -
Master PC - Kyle’s Adventure pt1 by profanity89
«Kyle finds an old copy of Master PC and uses it to control the reality around him.»
Rated 92.8%, Read 119895 times, Posted Wed 28th of February 2018
Fantasy , Blowjob, Body modification, Consensual Sex, Cum Swallowing, Domination/submission, Hardcore, Mind Control, Wife -
BEV--A GOOD DEED PAYS OFF by senorlongo
«Helping a classmate brings surprising dividends.»
Rated 95.9%, Read 119907 times, Posted Sun 13th of December 2020
Fiction , Anal, Consensual Sex, Cum Swallowing, Male / Female Teens, Oral Sex -
Ashley's Little Holes 3 by billdj
Rated 89.1%, Read 119925 times, Posted Sat 10th of March 2007
Fantasy , Anal, Consensual Sex, Cum Swallowing, Oral Sex, Teen Male/Teen Females, Young -
Me and Mike in the Tree House by Unknown user
Rated 90.2%, Read 119937 times, Posted Sun 18th of May 2008
True Story , Male / Female Teens, Masturbation, Oral Sex -
The Wife Next Door ch. 4-Babysitting Angela by flytoomuch
Rated 93.6%, Read 119949 times, Posted Thu 8th of July 2010
True Story , First Time, Male / Female Teens, Male/Teen Female, Older Male / Female, Virginity -
Part (1)- The Duplex (the new neighborhood) - part 1 by JadeGrey
«This is the first chapter of this 14-part story from my early twenties, when my girlfriend and I moved into a duplex in a low-rent neighborhood. In this chapter, I meet a few of the neighbors and realize I was surrounded by sexual opportunities of every kind.»
Rated 90.8%, Read 119961 times, Posted Mon 8th of May 2023
Fantasy , Male / Female Teens, Male/Teen Female, Teen, Young -
Nubile Bliss 2 by billdj
Rated 93.6%, Read 119970 times, Posted Fri 29th of August 2008
Fiction , Anal, Consensual Sex, Male/Teen Female, Young -
Summer camp and the glory hole by Nate Joes
Rated 80.7%, Read 119994 times, Posted Sun 25th of December 2005
Fiction , Blowjob, Cum Swallowing, Masturbation, Mature, Voyeurism, Young -
SWEET SOPHIE !! by matt
Rated 77.2%, Read 120002 times, Posted Thu 28th of July 2005
True Story , Young -
Local Pool by Smoothsailing2000
Rated 93.2%, Read 120021 times, Posted Sun 13th of September 2009
True Story , Anal, Bi-sexual, Blowjob, Consensual Sex, Cum Swallowing, Gay, Voyeurism -
Big Surprise_(0) by G. Snave
Rated 82%, Read 120036 times, Posted Wed 27th of July 2005
True Story , Anal, Bi-sexual, Blowjob, Cum Swallowing, Domination/submission, Mature -
The Secret Cheerleader Vote - #6 by Red Czar
«Stephanie steps into the game, but decides to play by her own rules»
Rated 96.4%, Read 120051 times, Posted Wed 1st of August 2018
Fiction , Consensual Sex, Teen, Teen Male/Teen Female, Young -
Latin maid made my day by Calvinator
Rated 53.5%, Read 120065 times, Posted Tue 16th of March 2004
True Story , Anal, Asian, Blowjob, Latina, Prostitution, Virginity -
My first time with a mature woman by Skye
Rated 78.3%, Read 120094 times, Posted Sun 1st of August 2004
True Story , Erotica, Male / Older Female, Mature, Oral Sex, Young -
My girlfriends sister_(1) by bob
Rated 62%, Read 120135 times, Posted Wed 20th of July 2005
True Story , Anal, Blowjob, Cheating, Virginity, Young -
My Cock hungry Sister-In-Law by cartman
Rated 82.4%, Read 120141 times, Posted Mon 13th of February 2006
Fantasy , Cheating, Consensual Sex, Cum Swallowing, Hardcore, Male/Female -
it happened on vacation (and continued at home) revised to pt 6 by str8tohell
Rated 96.6%, Read 120156 times, Posted Sun 31st of July 2011
Fiction -
The Birthday Present by CourtneyKitten39
«Jose wants to give his son the best 18th birthday present ever!»
Rated 92.8%, Read 120168 times, Posted Thu 1st of July 2021
Fiction , Cuckold, Older Female / Males, Reluctance, Teen Male / Female -
On Campus Foursome by nc233
Rated 93.2%, Read 120186 times, Posted Tue 14th of July 2009
True Story , Boy / Boy, Gay, Group Sex, School, Teen Male / Teen Male -
Sorority Sponsors by OregonDavid
Rated 95.6%, Read 120231 times, Posted Mon 23rd of June 2014
Fiction , Blowjob, Cheating, Cum Swallowing, Job/Place-of-work, Older Male / Female, School, Young -
The National Academic Championship by AR_ES76
«While reluctant to be in this situation, it ended up to be my first time.»
Rated 95.3%, Read 120246 times, Posted Fri 26th of June 2020
True Story , Blowjob, Consensual Sex, Cum Swallowing, First Time, Oral Sex, School, Teen, Teen Male/Teen Females, Virginity, Young -
The Girls Next Door – 10 Bills Birthday Pt 2 by oldman6976
Rated 96%, Read 120285 times, Posted Wed 30th of May 2012
Fantasy , Anal, Blowjob, Exhibitionism, Female/Female, Male / Female Teens -
Looked Older - Part 1 by Yossarian66
«The benefits of NOT looking your age!»
Rated 96.3%, Read 120306 times, Posted Sat 9th of June 2018
Fiction , First Time, Teen Male/Teen Female, Virginity -
Mr. Kircher by HighBlueSky
«Who better to share my body with than nice Mr. Kircher?»
Rated 94.6%, Read 120321 times, Posted Fri 24th of June 2016
Fantasy , Job/Place-of-work, Masturbation, Older Male / Female, Teen -
Her Name Was Lilly_(1) by Rebecca Vaughn
«A teen girl has an interesting encounter with another smoking-hot girl.»
Rated 93.8%, Read 120378 times, Posted Sun 3rd of January 2016
Fiction , Female solo, First Time, Lesbian, Masturbation, Teen Female/Teen Female, Voyeurism, Written by women, Young -
The Club, Ch. 5 - Back at Work by Lisa Ford
«Mr. Savage drops his new slave off at work.»
Rated 94.9%, Read 120396 times, Posted Wed 1st of May 2019
Fiction , Anal, BDSM, Bi-sexual, Blowjob, Bondage and restriction, Domination/submission, Group Sex, Job/Place-of-work, Lactation, Slavery, Written by women -
A Run on the Beach by bestmush
«On a beach vacation to Costa Rica, Danny sees a whole new side of his daughter's best friend, who has grown into a smoking hot athlete.»
Rated 94.6%, Read 120399 times, Posted Sat 25th of May 2019
Fiction , Male/Teen Female, Older Male / Female, Teen, Young -
The Third Richest Man in the World--Part 2 by senorlongo
Rated 95.7%, Read 120405 times, Posted Fri 1st of August 2014
Fiction , Anal, Consensual Sex, Group Sex, Oral Sex, Slavery -
My Roommate Judy by justicepr
Rated 93.5%, Read 120414 times, Posted Wed 21st of July 2010
Fiction -
Growing Up in One Weekend by stifflittlepoints
«Seduction is a game played . . . very slow . . . for the best results. Lexi, is in high school, and is excited about joining her Uncle Jim and her senior high school cousin Mike, at Jim’s cottage. Uncle Jim wants to play is own version of a Dare game he created.»
Rated 94.4%, Read 120444 times, Posted Sun 27th of September 2020
Fantasy , Cum Swallowing, Exhibitionism, First Time, Male/Teen Female, Masturbation, Oral Sex, Role-playing, Teen Male/Teen Female, Young -
The Prophecy Ch. 2 by StoryWeaver990
«The is a continuation of my previous story, The Prophecy Ch. 1»
Rated 94.8%, Read 120450 times, Posted Sun 8th of January 2017
Fantasm , Anal, Blowjob, Consensual Sex, Exhibitionism, Female exhibitionist, Female solo, Male / Females, Monster, Teen Male / Female, Voyeurism -
My Oral Audition – story 13 by stories for all
Rated 94.2%, Read 120453 times, Posted Sat 8th of October 2011
True Story , Blowjob, Cum Swallowing, Older Male / Female, Prostitution -
Mind over Matter Chapter 1. by Højreb
Rated 93.3%, Read 120471 times, Posted Sat 26th of May 2012
Fiction , Authoritarian, Male Domination, Male/Female, Mind Control -
Watching my wife by letsbbad
Rated 88.2%, Read 120480 times, Posted Thu 27th of October 2011
True Story , Black, Interracial, Voyeurism, Wife -
Dorm whore by beachshow
«Luck guy find himself an adventurist college girlfriend. He helps wake her up sexually. A unique relationship forms between Jack his roommate Dave and his new girlfriend Emma.»
Rated 83.5%, Read 120492 times, Posted Thu 21st of November 2024
News , Boys/Teen Female, Extreme, First Time, Group Sex, Hardcore, Male Male/Teen Female, Teen, Young -
A Lesbian Rape by dahkme
Rated 70.8%, Read 120537 times, Posted Sat 11th of November 2006
Fiction , Domination/submission, Fisting, Hardcore, Lesbian, Toys -
The Daring Naughty Sleepover 8 by UndeniableUrges
«Cindy and Stacy get into a little trouble at school.»
Rated 94.4%, Read 120585 times, Posted Sat 9th of April 2022
Fiction , Authoritarian, Female exhibitionist, Male / Female Teens, School, Young -
Office Girls by Dony
Rated 89.4%, Read 120603 times, Posted Wed 18th of February 2009
Fantasy , Blowjob, Cum Swallowing, Job/Place-of-work, Young -
Harry Potter and the Imperius Curse. by Flicker
Rated 80.3%, Read 120608 times, Posted Sun 11th of March 2007
Fiction , Anal, Blowjob, Boys/Teen Female, School, Virginity, Young -
ALISON UNCOVERED by jennivar
Rated 94.9%, Read 120627 times, Posted Sun 9th of February 2014
True Story , Anal, Erotica, Female exhibitionist, Female/Female, Lesbian -
My first Time_(71) by Hutter James
Rated 86.3%, Read 120648 times, Posted Wed 11th of January 2006
True Story , Consensual Sex, Cum Swallowing, First Time, Male / Older Female, Oral Sex -
My Party_(0) by Shadow Lynn parker
Rated 76%, Read 120649 times, Posted Mon 12th of July 2004
True Story , Consensual Sex, First Time, Group Sex, Wife -
Glory Holed by twizted771
Rated 95.2%, Read 120723 times, Posted Mon 6th of August 2012
Fantasy , Gay -
Summer with Daniel 2 by dunerider
Rated 94.7%, Read 120741 times, Posted Sat 1st of October 2011
True Story , Boy, Boy / Boy, Gay, Masturbation, Oral Sex -
My game at the game by Yvonne
Rated 92.7%, Read 120765 times, Posted Fri 9th of September 2011
Fiction , Blowjob, Cheating, Cum Swallowing, Exhibitionism, Female exhibitionist, Group Sex, Males / Female, Oral Sex, Wife -
I Dare You Ch 1 by Nate Joes
Rated 81.4%, Read 120766 times, Posted Sun 15th of January 2006
Fiction , Bi-sexual, Blowjob, Cum Swallowing, Oral Sex, Wife -
Wait Until We Are Married (Chapter 2) by Efon
Rated 92.7%, Read 120783 times, Posted Thu 22nd of March 2012
Fantasy , Blowjob, Cheating, Consensual Sex, Hardcore, Male / Older Female, Male/Female, Mature, Oral Sex, Pregnant, Reluctance, Teen, Teen Male / Female, Wife -
The only black kid. by Feedseed
«The adventures of a well hung black nerd in a town of hot white bimbos.»
Rated 93%, Read 120834 times, Posted Sat 20th of February 2016
Fantasy , Black, Blowjob, Cheating, Cum Swallowing, Hardcore, Interracial, Job/Place-of-work, Male / Older Female, Romance, Wife -
it happened on vacation (and continued at home) pt 10. by str8tohell
Rated 96%, Read 120852 times, Posted Thu 4th of August 2011
Fiction -
Who Knows, He or She ? 1 by MrE2
Rated 87.9%, Read 120854 times, Posted Thu 11th of January 2007
Fiction , Anal, Bi-sexual, Consensual Sex, Lesbian, Transgendered, Young -
BLACK COCK SCHOOL FOR GIRLS by Black Meat
Rated 64.4%, Read 120913 times, Posted Sat 7th of February 2004
Fiction , Interracial, School -
The Prophecy Ch. 7 by StoryWeaver990
«I apologize for the long wait now see what Luke is up to now that he is back and learning to use his new contracts as well as try to juggle what is left of his normal life.»
Rated 94.4%, Read 120951 times, Posted Tue 29th of January 2019
Fantasy , Anal, Asian, Blowjob, Consensual Sex, Domination/submission, Exhibitionism, Male / Older Female, Male/Teen Female, Mind Control, Monster, Romance, Teen Male / Female -
Am I just using him - chapter 1 by Stannie Stories
«Dan found out a gay boy liked him, and even though he is straight himself, he couldn't help but taking advantage of him. Or is he?»
Rated 95.1%, Read 121011 times, Posted Fri 22nd of March 2019
Fiction , Anal, Blowjob, Boy / Boy, Cum Swallowing, First Time, Gay, Teen Male / Teen Male -
wild adventures at the home by kingd1991
Rated 94.7%, Read 121014 times, Posted Sun 11th of July 2010
Fiction , Anal, Hardcore, Job/Place-of-work, Male / Females, Male / Older Female, Mature, Older Male / Female, Romance -
My New Houseplant 2 by PearlGlitter18
Rated 94.6%, Read 121032 times, Posted Sun 14th of September 2014
Fantasm , Anal, Consensual Sex, Cum Swallowing, Extreme, Hardcore, Monster, Oral Sex, Pregnant, Written by women -
MOM IS A CLOSET SLUT PART 3 by stewocity
Rated 95.3%, Read 121047 times, Posted Tue 4th of September 2012
Fantasm -
Becoming an Anal Sex Whore by pdosu
Rated 95.2%, Read 121053 times, Posted Thu 3rd of September 2009
Fiction , Anal, Cum Swallowing, Domination/submission, Gay, Hardcore, Oral Sex -
Retired - Chapter Four – Battle in the dark by Brootforce
Rated 96.4%, Read 121059 times, Posted Wed 12th of November 2014
Science-Fiction -
RETIREMENT--PART 2 by senorlongo
Rated 96.8%, Read 121110 times, Posted Thu 13th of February 2014
Fiction -
hot jock steals my virginity by itsmenigga
Rated 89.3%, Read 121137 times, Posted Tue 14th of February 2012
True Story , Boy / Boy, Gay, Teen Male / Teen Male, Virginity -
Michelle - The Sleepover - Ch by michellev
Rated 83.6%, Read 121163 times, Posted Tue 31st of October 2006
True Story , Female exhibitionist, Teen Female/Teen Female, Toys -
SLuT9 by kristof2050
Rated 94.4%, Read 121215 times, Posted Wed 18th of January 2012
Science-Fiction , Coercion, Drug, Male/Female -
How I Got My Job Part 1 by kaytee83
Rated 85.1%, Read 121236 times, Posted Wed 1st of October 2008
True Story , Blowjob, Cum Swallowing, Interracial, Job/Place-of-work, Males / Female -
JUST AN OLD-FASHIONED GIRL--Part 5 of 6 by senorlongo
«Me and my old-fashioned girl.»
Rated 97%, Read 121239 times, Posted Tue 10th of January 2017
Fiction , Consensual Sex, Oral Sex, Romance -
A black cock for mom by J Stewart
Rated 87%, Read 121251 times, Posted Fri 21st of January 2011
Fantasm , Cheating, Interracial, Job/Place-of-work, Wife -
Fucking my little teen cousin by Matzeify
Rated 47.9%, Read 121266 times, Posted Wed 29th of February 2012
True Story -
Politico's wife part 2 by abruzzi11
Rated 96.6%, Read 121290 times, Posted Mon 17th of September 2012
True Story , Blowjob, Consensual Sex, Older Male / Female, Oral Sex