Sort by
Relevancy

Free Stories

100%
Late Night Snack (Touch me in the morning)
I was awakened abruptly by someone banging on my door at 1am. At first, I thought it might be Harry, the man who replaced Mr. Cobb in my bed a few nights ago. He had been persistent and horny constantly. I think it was because fucking trans women like me was new to him and he hadn’t got enough of th... Read full Story
Regina10 2024-03-28 4,484 anal Big Tits Bareback Creampie Shemale Fucks Guy Blowjob Big Cock Ebony Ladyboy Lingerie
91%
The New Housemate's Secret
https://chyoa.com/chapter/Introduction.150836 The New Housemate's Secret How will you discover the hot new tenant's secret? Chapter 1 by Bauer1 The doorbell rings, a soft knocking accompanies the bell to break the silence of the house. You look up from your laptop nestled snuggly in your la... Read full Story
Acche 2019-04-04 22,560 Big Tits Cumshot Creampie Shemale Fucks Guy Blowjob Big Cock Guy Fucks Shemale handjob titfuck titjob cum in mouth
100%
The Big Mature Shemale Next Door
The Big Mature Shemale Next Door SugarandSalt "Please can I just wear my old swimming trunks?" Warren begged. "No!" his mom yelled back from the other room. "Barbara purchased that for you. It was expensive so you better remember to thank her." Warren looked at himself in the full length mir... Read full Story
Gwapo67 2022-05-03 8,782 Bareback Creampie Shemale Fucks Guy Blowjob Big Cock Mature cum in mouth
84%
SUMMER VACATION by Spanky de Bautumn
In our house, it was a well-known secret that my mother kept her change in the top drawer of her dresser. The same drawer she kept her slips, chemises, panties, and all other satin, nylon, or lacy ladies undergarments. During the summer, my brother and I would run to that wondrous drawer when... Read full Story
SpankydeBautumn 2021-01-22 13,142 Small Tits Crossdresser Cumshot Masturbation Fetish Blowjob Lingerie Shemale and Girl cum in mouth
78%
A Little Girl Forever
Since I was a little girl I dressed in my sister's clothes, she knew it and she kept clothes for me and sometimes she bought clothes thinking about me. She was my accomplice and still is. When I was alone I dressed totally as a woman and I felt totally satisfied and realized as such, this included m... Read full Story
Mabel Cecilia 2019-05-06 8,615 Small Tits Crossdresser Amateur Cumshot Latina Masturbation Creampie Blowjob blonde Lingerie Shemale and Girl Guy Fucks Shemale Sex Toys Mature self sucking Solo Shemale cum in mouth double anal shemale + shemale
92%
Southern Hospitality Ch. 04
XtinaSmith2017 Ash awoke feeling cold, he pursed his lips a little and shivered, curling up a little tighter, nude as he was, the action brought little relief from the cool air. He let out a soft murr of discomfort as his mind shook off the cobwebs of lingering dreams, he could see light throug... Read full Story
Gwapo67 2022-05-16 7,258 Big Tits Bareback Creampie Shemale Fucks Guy Blowjob Mature cum in mouth
100%
Sissy Femboy Chrissy in Drag at the Club
"Can you wear a dress tonight?" "I can't crossdress in public, I'm not 'out' and don't want to be seen that way." "That's okay. We're going to a gay-only club that has a drag queen show tonight, so you'd fit right in." "Cool, but I'll have to change when we get there." "Awesome! See you tonight!... Read full Story
Chrissy Tunnell 2022-02-03 5,752 Crossdresser Amateur Bareback Shemale Fucks Guy Fetish Blowjob Ladyboy Lingerie domination Guy Fucks Shemale Mature Homemade cum in mouth
100%
Uncle sweet Lover
Uncle Barney called me this morning and wanted me to keep my evening free. He wanted to meet me at the motel with a surprise for me. I was so excited and could hardly wait. I had to decide on something to wear, but when I thought about it, I realized that I wanted to wear something special. He would... Read full Story
Regina10 2024-02-19 5,522 anal Crossdresser Big Tits Creampie Fetish Blowjob Big Cock Ebony Ladyboy Guy Fucks Shemale Mature big ass femboy
100%
My first Escort girl
I was in my early thirties. I had just out of a relationship that ended very brutally. I was hurt for several years as I took it difficult. It was at this time, already having had my first sexual experience with a Crossdresser/Ts when drunk and still thinking of that experience that I decide... Read full Story
likesboth 2024-11-05 2,231 anal Cumshot Blowjob Big Cock Asian Frottage femboy
86%
My First Ladyboy
I was working in Bangkok a couple of years ago. As was the normal practice all the guys would finish work on a Friday afternoon and head to the local bar for a couple of beers.. This particular Friday we were in the usual place chatting and having a nice relaxing time......when she walked in....t... Read full Story
shemale lover 2015-05-23 8,957 anal Blowjob Asian
100%
Fulfilling A Girl's Male Fantasy Part 2
Since our first meeting had gone so well, Jennifer and I started going out together. Other than the fact that in the bedroom I was the "man" only about half the time, it was a fairly normal relationship, apart from possibly being even more open with each other about our desires. One day a ... Read full Story
shemale lover 2012-04-04 4,816 Stockings anal sex Group Sex Blowjob
100%
Exposure, Disclosure
The Greatest Liar, Exposure, Disclosure © Alexandra Rios 2019 Author’s Note: This is a continuation of the narrative which commenced with “My Awkward Phase”, which I posted here previously. Readers may wish to read that before continuing, although I have written them to stand alone. Natives s... Read full Story
the greatest liar 2019-06-18 8,280 Teen (18+) Small Tits Amateur Group Sex Latina Blowjob gangbang Guy Fucks Shemale cum in mouth
88%
Girl from Uncle
Tonight, I have to tell it all. It’s no secret that my uncle and I had a very special bond he had been eyeing me with those adventurous eyes from the time that I was 14 years old. And frankly I enjoy his ogling. I could feel my nipples get so hard when he looked through me with those alert and spark... Read full Story
Regina10 2024-02-14 5,893 anal Crossdresser Big Tits Bareback Blowjob Big Cock Ebony Lingerie Guy Fucks Shemale big ass femboy Ass to Mouth cum in mouth
75%
Aunt trip
In 2013, after almost three years of service in Afghanistan, George Madsen, a gay Royal Navy communications petty officer, retired. His experience in the distant deserts had left an indelible mark, the memories of friends lost and challenges faced still burned vividly in his mind. Coming home was n... Read full Story
Rebba 2024-04-25 4,061 Shemale Fucks Guy Blowjob Big Cock Ladyboy Guy Fucks Shemale shemale fucks shemale Fantasy Tale
100%
The Next Level
Nitromethane It's been a couple of weeks now since I sucked my last shemale cock and swallowed her load, and with enough distractions, it hasn't been too difficult keeping myself preoccupied and my mind off of satiating my new fixation. Still though, I do have my moments when I sit back and imagi... Read full Story
Gwapo67 2022-02-01 6,574 Bareback Creampie Shemale Fucks Guy Blowjob Big Cock gangbang domination cum in mouth
100%
Special Shemale Fun
Everyone in the hallway jumped slightly, turned and quickly looked at the tall girl near the sound of the slamming locker. Satisfied that there was no crisis at hand, the kids at the school mostly went about their business. Of course, there were the few admirers that glanced at the girl at the locke... Read full Story
shemale lover 2012-02-06 5,664 sucking shemale massage
81%
Ladyboy Switch Story
I am messed up with how I feel about this. I still love looking at women. I love tits and arse. I like the soft feel of women – kissing them and feeling their bodies. I don’t look at men in public and get turned on – men with clothes on do nothing for me. Put me somewhere that I can see those same m... Read full Story
shemale lover 2015-02-27 7,558 Cumshot suck Shemale Fucks Guy Ladyboy ass fucking swallowing
100%
Towel Boi: You're Hired
Kasey Stevens woke up in his new studio apartment. The five-foot-nine, blue-eyed sissy with ash brown hair yawned and stretched before heading into the bathroom. He showered, taking good care to lather his rosy skin with strawberry scented body wash. He shaved his legs and rinsed off. Then, he appli... Read full Story
Faggyboi and Puzziboi 2023-11-14 6,724 anal Small Tits Crossdresser Amateur Bareback Blowjob Guy Fucks Shemale Interracial small cock big ass femboy
88%
Alex
I'm a straight guy! a few years ago, I stubble the cross shemale p***. now I must say, it felt weird, I mean being used to watching females doing p*** on my life. but I have to admit, these shemales that I was watching were passable, and most of all looked very f*******. shemale p*** made my di... Read full Story
Mike212 2018-05-28 7,096 Teen (18+) Small Tits Amateur Blowjob Ladyboy Guy Fucks Shemale
85%
My Awkward Phase
My Awkward Phase ©Alexandra Rios 2019 The greatest lie is that what happens in high school doesn't matter, because life begins in college. I pretended to agree, although I never believed it, for I was the world's greatest liar. Wannabees I was hanging out with my friends Quinn, Barb and Anne ... Read full Story
the greatest liar 2019-06-14 12,530 Small Tits anal sex Latina Masturbation Bareback Creampie Blowjob Big Cock transformation gangbang Shemale and Girl Guy Fucks Shemale Sex Toys Ass to Mouth cosplay hormones high school real life situations
100%
TO BE OR NOT TO BE – PART 2
TO BE OR NOT TO BE – PART 2 by Spanky de Bautumn Part 1. Sunny, Mel, and Shari learn they are going to New York to perform a play off Broadway and are really excited about it. Being a small troupe, we unseen members had to wear many hats. Unfortunately, there was just the two of us, Joe Donn... Read full Story
SpankydeBautumn 2021-02-22 4,156 Small Tits Crossdresser Cumshot Bareback Blowjob Big Cock Lingerie Guy Fucks Shemale Interracial cum in mouth
100%
TG Girlfriend moves in
Monday morning 6:00 am and I am just awakening, and I realize a naked body beside me has her arm around me, we are both naked. My wife Lydia is out of town to a seminar, and this adorable brunette perky tits and lovely eyebrows, beautiful lips slightly pink, sleeping beside me. Joanne and I had spen... Read full Story
Jon Paul 2022-01-18 5,742 Amateur Cumshot Latina Masturbation Bareback Creampie Shemale Fucks Guy Blowjob Ladyboy Guy Fucks Shemale cum in mouth
100%
TG Neighbor
With Christmas and New Year’s over, the weather here in Florida has become cooler, 45 degrees last night and it will be in the mid-sixties for the rest of the week. We live in a sub-division right off the waterway, very private. My neighbor usually comes down around Christmas and stays until tax ti... Read full Story
Jon Paul 2022-04-22 7,173 Big Tits Cumshot Latina Bareback Creampie Shemale Fucks Guy Blowjob Asian Ladyboy Guy Fucks Shemale
87%
Southern Hospitality Ch. 03
XtinaSmith2017 Ash looked himself over in his bedroom mirror critically, finding himself oddly self-conscious about his looks. He had been texting Laura all throughout the day and they had agreed that dressing pretty casual would draw the least suspicion, so he had. He wore a simple patterned ... Read full Story
Gwapo67 2022-05-16 5,253 Bareback Creampie Shemale Fucks Guy Blowjob Big Cock Mature cum in mouth
60%
Shemale Chrissy Fucked by a Demon
I wanted to write this the night it happened, Halloween, but I was still so traumatized. I was at my fictional fantasy Sugar Daddy's house alone and already spooked out by the noises of this old hundred-year-old wooden house in this loud thunder storm on what some call "Devil's Night." I had to turn... Read full Story
Chrissy Tunnell 2022-12-01 4,585 Small Tits Crossdresser Amateur Bareback Fetish Blowjob Big Cock Ladyboy Lingerie domination Guy Fucks Shemale cum in mouth
91%
Masturbation fantasies: Amanda, queen of the peep show
A guy visits a peep show with unexpected results. As he gets to watch a girl with something special, he discovers his hidden desires. This story contains: peep show – voyeur – gloryhole - fake tits – group masturbation – male masturbation – shemale – frottage - titfucking When William finall... Read full Story
ThatEroticWriter 2019-07-24 8,924 Big Tits Cumshot Masturbation Uniform Frottage
66%
Sex in the kitchen with my hubby's friend - a cop
Ever since my wedding last year, I enjoy a great time with my hubby who loves me so much and takes care of me so much. Since he is married and having another family, he doesn’t stay with me all the time, but comes and stays at least 2 or 3 days in a month and we literally celebrate those nights wit... Read full Story
Manusha Tranny 2021-10-14 5,974 Small Tits Crossdresser Amateur Cumshot Outdoor Blowjob Big Cock Asian Ladyboy Guy Fucks Shemale Ass to Mouth cum in mouth
100%
Casino Girl
I had been working as a casino dealer for several years and would occasionally meet some very attractive women and chat. Asian women have always been attractive to me, whether the exotic appearance or maybe because my Mom was Pacific Islander, and a lot of people thought I was Asian. Mia was a bit... Read full Story
Jon Paul 2022-01-03 3,340 Stockings Cumshot Bareback Blowjob Asian Ladyboy Guy Fucks Shemale
100%
Pizza Delivery
She wraps her hands around the back of his head and shoves her cock harder and further into his throat. She can hear him gag and saliva burble in his throat. “FUCK I’ve needed this!” She says, pulling her cock out of his mouth and letting him take a deep gasping breath. “Holy fuck,” he says, cat... Read full Story
ghostpeople 2022-11-22 6,441 Bareback Shemale Fucks Guy Blowjob Big Cock Uniform Ass to Mouth cum in mouth
100%
The best blowjob I ever gave
Back in 2010 or so I was living in the south(USA). I was a frequenter of Craigslist and other sites to hook up with prostitutes, shemale, Ts, and men. I was doing errands on the weekend and was checking on my phone for craigslist ad's and found one that was a little different. This woman had not pu... Read full Story
likesboth 2024-11-29 1,259 Amateur Cumshot Big Cock Ebony femboy cum in mouth
100%
Shawshank affair
Courtrooms can be a scary place. They smell like older leather, the wood paneling has been polished with oil and each sound penetrates your body like a loud smack from a cap pistol, which echoes in the forest, especially the gavel smacking on a block from the Judge. I felt strongly that I would be f... Read full Story
Jon Paul 2018-08-20 7,071 Stockings Crossdresser Cumshot Bareback Creampie Shemale Fucks Guy Blowjob Ladyboy Guy Fucks Shemale Ass to Mouth cum in mouth
90%
A pervy uncle invited me to his house at 10 PM..!
It's been 8-10 years now, I had this amazing experience. I was standing at the bus stop in my area/street(my daily routine), one uncle was watching me but I ignored eye contact as I feel awkward the way he was looking at me because I act straight in public and I felt that he's seen my girly ... Read full Story
Cindy Sky 2021-07-20 7,730 Teen (18+) Small Tits Amateur Cumshot Outdoor Bareback Creampie Fetish Blowjob Asian Ladyboy Mature
88%
Alex and Jon
Alex was not beautiful, but had a sexy attractiveness that most could not help but take a second look. This was the case with Jon as he searched adult Friend-Finder ads for someone that would satisfy his desires and dreams of a companion. Alex, a transgendered Filipina girl, had the bronze skin colo... Read full Story
Jon Paul 2022-09-21 5,811 Group Sex Cumshot Bareback Creampie Shemale Fucks Guy Blowjob Asian Ladyboy Guy Fucks Shemale cum in mouth
60%
Susan's First Time Part 4
The shadows of late afternoon crept across the city when Susan paid the cabbie off. Why had 'he' wanted her to come down to this neighborhood? She looked around with apprehension at the garish lights of bars and adult bookstores flashing in the growing darkness. One or two streetlights flickered on ... Read full Story
shemale lover 2011-10-14 3,400 Small Tits shemale massage
87%
TO BE OR NOT TO BE – PART 1
TO BE OR NOT TO BE – PART 1 by Spanky de Bautumn This is a story about how taking a play to New York City changed people's lives. A transgender coming of age story. I was born Harold Stanley Dayes, not a great name for a kid growing up. I know my parents loved me, but Harold was my mom's dad a... Read full Story
SpankydeBautumn 2021-02-22 4,457 Crossdresser Amateur Group Sex Cumshot Fetish threesome Blowjob Ladyboy Lingerie Shemale and Girl cum in mouth
100%
2nd date with Latina Sissy Destiny
So this was my second time with Destiny, a really cool Latina CD/Sissy who had just turned 22. You might want to read my first goaround with her title, “Deflowering Latina Sissy Destiny” as it will give background and context here. After our first encounter, she signaled that she was definitely... Read full Story
AllenB 2022-04-05 4,564 Crossdresser Cumshot Latina Creampie Shemale Fucks Guy Blowjob Interracial cd Homemade sissy cum in mouth cum swallow amatuer cd
87%
Chicago TG Romance (part 2)
As you must read part one of this story, one of the most interesting and attractive T-girls I have met is sleeping beside me in my motel room after a wonderful evening of being together. Beth awakened around 4am and got up to go to the bathroom. She was brushing her teeth and heard me stirring, I di... Read full Story
Jon Paul 2018-06-04 6,474 Amateur Shemale Fucks Guy Blowjob Asian Ladyboy Ass to Mouth cum in mouth
70%
Shemale Gangbang
I am not your average female. But I guess I am not your average male either. You see, I am a tranny. I make a really hot woman. I am 5'10", am slim and have dark, wavy hair that comes down to tight between my shoulder blades. The only thing I was missing was beautiful tits. So I got those as we... Read full Story
shemale lover 2011-08-27 17,981 anal Blowjob cum swallowing
100%
His Perfect Shemale Partner Part 2
Quite a few things have changed since the last chapter. OK maybe not that many, I am still lusting after Sally's body needing to have my dick in her and feel her in me, but we are a lot closer now as we are living together. Sally has gone to her 1st choice University and I decided I would rather get... Read full Story
shemale lover 2011-08-28 5,275 Blowjob shemale cum
94%
Renting out a room
When my wife suggested that we rent out the guest rooms above the garage to a college student it sounded like a good idea. It was very much like a small apartment, with a bedroom, bathroom, and small living room. No kitchen of course, but we could share ours and it seemed like a good way to make a l... Read full Story
Alic91lovesporn 2015-07-29 21,989 suck shemale jerking orgasm domination
92%
The Girl Next Door Ch. 02 by derezzed ©
Chapter 2 – Taking the Next Step Into Depravity Michael hardly got any sleep that night. When he did his dreams were filled with images of Jenny and her large penis. He tossed and turned in frustration. As he rolled over for what felt like the thousandth time he was blinded by the sunlight that h... Read full Story
StevelovesTgirls 2019-06-11 12,999 Amateur Big Tits Blowjob Big Cock Guy Fucks Shemale
96%
My First Sex with Tgirl
This is story about me......Hope you all enjoy it I was 19 years old and itching to have sex like every normal teenager. Years of jerking off to porn had only expanded my imagination and made me want to fuck a girl even more. I was turned on by just about anything and everything except gay porn. Ev... Read full Story
sach 2016-02-16 14,043 first time tranny ass fucking guy on shemale mutual suck
94%
Shemale Ride Along Part 1
I'm going go ahead and get this out of the way. During my freshman year of college, I was confused about my sexuality. It sounds strange saying this right after calling myself confused, but I loved girls. I really did. I loved all of their shapes and curves. I loved tits, pussy and ass. Now... Read full Story
qtball 2016-08-29 12,959 anal tranny Blowjob Big Cock bj asstomouth
100%
Big Dick Alessia Visits Dallas
Alessia Hung Mature MILF travels to visit a Big Dicked Man and his Sexy Household If you like Transexuals, big cocks, bondage, BBWs, big clits, deep throat, fisting, 69, ass fucking, sounding, piercing, cum swallowing and big loads this story is for you. If not don't bother reading. If you fav... Read full Story
darrell 2022-04-20 4,962 Group Sex Cumshot Shemale Fucks Guy Blowjob blonde Big Cock Asian Shemale and Girl Sex Toys Mature Ass to Mouth shemale + shemale
100%
The Seductive Seed of a Tranny MILF
The Seductive Seed of a Tranny MILF SugarandSalt Jackson got home and immediately curled up in bed. He didn't want to move for the rest of the weekend. He'd finally worked up the courage to ask a co-worker out at work. She politely rejected the invitation. Then later on in the day, Jackson spo... Read full Story
Gwapo67 2022-05-03 8,434 Bareback Creampie Shemale Fucks Guy Blowjob Big Cock Mature cum in mouth
100%
The Girl Next Door Ch. 02
derezzed Chapter 2 – Taking the Next Step Into Depravity Michael hardly got any sleep that night. When he did his dreams were filled with images of Jenny and her large penis. He tossed and turned in frustration. As he rolled over for what felt like the thousandth time he was blinded by the s... Read full Story
Gwapo67 2022-05-13 5,747 Bareback Creampie Guy Fucks Shemale cum in mouth
100%
Tight Spot
XtinaSmith2017 Cody bit his lip as he looked over towards the shop, a little anxious about their planned endeavor but not wanting to come off as uncool to his friends, "Are you sure this is a good idea?" he asked. His friends grinned and laughed, playfully nudging him as they made their way ... Read full Story
Gwapo67 2022-07-22 6,399 Big Tits Bareback Creampie Shemale Fucks Guy Fetish Blowjob Big Cock Lingerie domination cum in mouth
86%
Party with my best friend
To continue the topic of shemales fucking girls, I am publishing this awesome story of a young girl getting fucked by her high school friend! Enjoy reading! My name is Cindy, and I am 18 years old. I have blonde hair and brown eyes, and boys think I am very sexy and attractive. But the story I am... Read full Story
shemale lover 2015-06-09 5,873 Blowjob blonde cum
40%
See Me At Shemale Cam Tube
I was dressing when I heard a new e-mail arriving. "You're hot as hell on Shemale Cam Tube", he wrote, "Wanna meet me 4 lunch? Promise to be a gentleman!" It was cute, especially coming from such a skinny guy. I'm a big girl - over six feet, with strong legs and huge breasts whic... Read full Story
shemale lover 2011-08-09 6,991 asshole Blowjob shemale
100%
First Time With Shemale
For as long as I can remember, I've preferred my chicks with dicks. There's something about a sexy babe with perfect makeup and hair and a cock that just turns me on. Maybe that makes me a pervert - I don't care! I remember I was just out of high school, 18, the first time I made it with a tranny. S... Read full Story
shemale lover 2011-08-26 4,299 anal Creampie shemale
100%
Rebecca's Secret Part 2
-5- Rebecca lay in my arms, trembling after the most incredibly orgasm she’d ever experienced. Hell, it was the most incredible orgasm I’d ever experienced and I wasn’t even the one who’d had it! We held one another in the darkness, myself stripped of every article of clot... Read full Story
shemale lover 2011-10-19 4,484 Small Tits asshole orgasm ass licking
87%
They Were Right
They were my friends, but I'd had sex with both of them. Not at the same time, but I had dated the one for a month and just started dating the other. So, although the thought had never crossed my mind before, I found myself dressed up as a girl for Halloween. After we had partied at a few clubs and ... Read full Story
shemale lover 2011-12-29 6,313 shemale Big Cock porn
100%
Caught and Punished
I had walked into the mall on a Friday afternoon with a group of my friends, Steve, Bill and Ryan. The plan was pretty' simple; Bill would stand guard while Steve, Ryan and me went into the jewelry store. Steve and Ryan would distract the clerk while I went around to one of the glass cases and picke... Read full Story
shemale lover 2013-01-29 9,832 anal sex Shemale Fucks Guy Blowjob gagging deeptroat
42%
sexy jane story
I love the idea being a crossdresser wearing women outfit bars in panties n sexy outfit not just for the sex I love sex being on my knees sucking cocks in getting fuck by a big cock see win I was very young I had sex with 3 guys one day they ask me will I suck there cocks in I sand yes we want insid... Read full Story
45sexyjane 2019-05-27 4,654 Small Tits Crossdresser Amateur Big Tits Masturbation Blowjob blonde Big Cock gangbang Lingerie Sex Toys shemale + shemale sexy crossdresser
100%
Intense
Holding to my word, I didn't let the incident with Billy and his friends scare me away from Bailey; I kept seeing her, even after the beating I took. To be honest, I'm not sure if he was trying to lay low or what, but Billy seemed to keep his distance from me for a while...thankfully. Bailey and ... Read full Story
Verpa 2019-10-21 11,258 Big Tits Cumshot Bareback Creampie Shemale Fucks Guy Blowjob Big Cock cum in mouth
25%
Fantastic threesome w/ Miranda Pinocchio & Danielle Albuquerque
Today taken by the craving for something really big I call Miranda who answers me immediately and despite the language barriers and her way of speaking not always understandable we agree for 70 and a quiet thing. I sling in Naples, central area, the usual low in the alleys between via Marina and the... Read full Story
RonWisley 2020-05-04 5,083 Amateur Cumshot Shemale Fucks Guy threesome Blowjob Big Cock