Sort by
Relevancy

Free Stories

100%
Surprise Ending (The End)
Karla struggled a bit to get the huge, bulbous head of her cock inside of me. It was like my ass had licked a battery. A charge went through my body that while painful, was exhilarating and exciting. "Ahhh," from my lips was all the encouragement I could offer and Karla took it. She steadily push... Read full Story
Chantel13 2022-08-23 5,500 Amateur Outdoor Shemale Fucks Guy Big Cock Shemale and Girl Guy Fucks Shemale Ass to Mouth cum in mouth
100%
FORMATION D'AMOUR ⚧️ 💗 ⚧️
Kyla essuya la sueur de ses yeux, puis essuya le liquide de sa main, tout en s'appuyant sur son balai. Ce putain de jour était trop chaud, bien trop chaud. Elle regarda autour d'elle : le vestiaire vide était complètement immobile, attendant patiemment d'être nettoyé, son air saturé de l'odeur de... Read full Story
Femboy 2021 2023-02-17 947 Cumshot Shemale Fucks Guy Fetish Blowjob Big Cock Futanari cum in mouth
100%
Caught Spying 👀
Caught spying to 1st time sucking. A few years back now I took a drive to a dogging & cruising hot spot in the Haldon Hill Forest on the A38 in sunny Devon. I'd been once b4 with a trucker who picked me up hitchhiking. (That's another story WOW his cock was huge 8.5" @ least. matched his muscular a... Read full Story
Streethawk75 2023-04-18 5,152 Crossdresser Outdoor Masturbation Shemale Fucks Guy Blowjob Big Cock
100%
ATTENTES SUBVERTIES ⚧️ ⚧️
Les choses allaient si bien.... Après un long et misérable quart de travail, Steven rentrait enfin chez lui. La plupart des gens détestent faire la navette, mais Steven trouve que la demi-heure de route est un moyen idéal pour se détendre avec un livre audio ou un podcast. Dernièrement, cette pet... Read full Story
Femboy 2021 2023-02-17 1,051 Cumshot Shemale Fucks Guy Fetish Blowjob Big Cock Futanari cum in mouth
40%
First Sexual Crossdress Experience
How my secretary found out I'm a bi TV and how me and my TV friend educate her into some of the more zany aspects of TV sex. *** As I laid back against the wall of the toilet with my nylon-clad thighs spread wide and my erect cock jutting up lewdly from between them, the wooden door in front o... Read full Story
shemale lover 2012-09-27 5,565 first time Fetish cum oral crossdressing nylon
88%
Purple Kiss, part 1
It happened during a week long trip for work. By the third night in a strange city I had grown tired of the hotel bar and broke away from my work colleagues for change of scenery. I told my coworkers that I was going to bed then quickly made my escape. The night was warm so I decided to take my o... Read full Story
Transadmirer 2016-01-02 10,061 Creampie Shemale Fucks Guy Fetish cum domination gangbang sex
100%
ENFERMÉ HORS DE L'APPARTEM ⚧️ ⚧️
Je m'appelle Layton McGuire. Quand j'avais 22 ans, je vivais à New York et je partageais un très petit appartement à loyer contrôlé à Greenwich Village avec deux autres colocataires pendant que nous fréquentions le City College (qui est un vrai collège, pas seulement un nom générique, cherch... Read full Story
Femboy 2021 2023-03-20 769 Shemale Fucks Guy Fetish Blowjob domination Futanari cum in mouth
57%
Amsterdam shemales
This was a few years ago I decided to go to Amsterdam and see if I was gay . Booked A weekend and went drinking,went around the the red light district see what girls and others were around. Went to this beautiful brunnett girl from Bulgaria with big tits, she started sucking me off but I could not ... Read full Story
Saoirse1973 2017-06-28 16,758 Shemale Fucks Guy Blowjob Ebony Interracial
80%
Transsexual Savage
John had walked for eleven days. He was headed towards Fort Winston at the Hiat River, and he still had about three days ahead of him. The Hiat River was the natural border that separated the civilized world, where he came from, and the savage and brutal wilderness, where the natives lived and pract... Read full Story
Anal Orgasm 2020-07-10 6,265 Big Tits Outdoor Masturbation Bareback Creampie Shemale Fucks Guy Blowjob Guy Fucks Shemale
100%
My wonderful life with Pat : The tattoo
Few hours later Marie and Pat arrived, Marie ordered me to stand-up and kiss me hardly with her tongue rolling in my mouth. She say me goodbye and thank you so much for dinner and the marvelous night, Pat is really lucky with you. I was so surprised i reply by a shy thank you. After Marie has le... Read full Story
jperrot 2020-09-18 4,500 Amateur Outdoor Shemale Fucks Guy domination Ass to Mouth cum in mouth
100%
FOUTAREICH
Le Parti de l'apothéose féminine, ou FAP, a reconnu les différences physiques entre les hommes et les femmes. Cependant, la FAP a affirmé que même si les femmes pouvaient être physiquement inférieures aux hommes, elles étaient moralement supérieures. Tant que les hommes seraient plus forts que l... Read full Story
Femboy 2021 2023-02-11 1,103 Crossdresser Cumshot Shemale Fucks Guy Shemale and Girl Futanari cum in mouth
50%
SISSY JESS, COCU PAR MAMAN ⚧️ ⚧️
"Jess, Jess, j'ai besoin que tu m'aides à porter les courses." Jess gémit et, coupable, il souhaita que sa mère demande à quelqu'un d'autre de l'aider. Il voulait juste regarder toutes les autres filles sissy sur Twitter et obtenir son petit « excitation » dur. Il desc... Read full Story
Femboy 2021 2023-03-21 918 Stockings Crossdresser Fetish Shemale and Girl Guy Fucks Shemale cum in mouth
100%
My Noisy Upstairs Neighbors Part 3: Making Porn
In Part 2, I recounted how Paul, my commanding upstairs neighbor, coerced me into making porn with him and his younger roommate. Now, I'm excited to share the first video we created together. At 12:45 PM on Saturday, I nervously approached Paul's door. After knocking, Paul opened it with a smile ... Read full Story
Chrissy Tunnell 2024-07-16 304 Crossdresser Amateur Group Sex Bareback Fetish Blowjob Ladyboy gangbang Lingerie domination Guy Fucks Shemale sissy femboy
86%
Alex’s Bottom Slut
So when I was younger, I worked at a pizza place as a delivery guy. It was a pretty boring job for the most part but that all changed one night. I got a delivery to just outside of our range but decided to take it anyways because we were slow. When I got there a very tall and muscular black woman in... Read full Story
Jsmithsub 2019-11-18 56,528 Group Sex Cumshot Shemale Fucks Guy Blowjob Big Cock Ebony gangbang domination Interracial Ass to Mouth cum in mouth
80%
Ein Traum von einem perfekten Cruising-Erlebnis
Die meisten Elemente habe ich bereits beim Cruisen erlebt. Aber die Kombination aus all dem mal un einer Begegnung wäre traumhaft. Ich stehe im Duplexx in einer der Kabinen. Wie üblich trage ich nur BH, Höschen, Hemdchen, enges Top und Halsband. Meine Brüste kommen gut sichtbar zwischen BH und T... Read full Story
Jasmin_P 2021-03-02 3,264 Amateur Group Sex Bareback Creampie threesome gangbang Lingerie Guy Fucks Shemale Ass to Mouth piss drinking cum in mouth
88%
My wonderful life with Pat : Domi and Morgan
second part of the tattoo ..... I was nervous to be tied and at her mercy.Morgan put on a mask to make me blind and she tightened the ties to keep me from moving. Then with a very soft voice Morgan sussed me, don’t be afraid, i will make this day an unforgettable one. You will have a such intens... Read full Story
jperrot 2021-04-09 3,156 Amateur Outdoor Masturbation Bareback Shemale Fucks Guy threesome Blowjob domination Ass to Mouth cum in mouth
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 5,794 shemale Big Cock porn
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 5,726 Bareback Creampie Shemale Fucks Guy Blowjob Big Cock gangbang domination cum in mouth
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 4,307 Group Sex Cumshot Shemale Fucks Guy Blowjob blonde Big Cock Asian Shemale and Girl Sex Toys Mature Ass to Mouth shemale + shemale
93%
MILF Alessia Travestita finds a bottom boy
I was several days into a cruise to New Zealand and Australia with my wife. This morning my wife went on an excursion that I had no interest in, so I had the cabin to myself. I hadn't had any sex with my wife in the last 3 days due to the activities such as the various jaunts to Auckland and the sur... Read full Story
darrell 2023-08-13 6,135 anal Cumshot Shemale Fucks Guy Fetish blonde Big Cock domination Mature deep throat cum in mouth sandals
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 3,157 Shemale Fucks Guy Blowjob Big Cock Ladyboy Guy Fucks Shemale shemale fucks shemale Fantasy Tale
84%
Lesser of Two Evils
My name is Eric. At 21, I was working as the IT guy at a prominent Caribbean cruise company. My days were usually pretty boring. Fixing computer problems were usually a no brainer for me. People are so stupid when it comes to how they use their machines that I assume there will always be a need for ... Read full Story
shemale lover 2013-03-27 22,742 hardcore Cumshot sucking ass fucking Guy Fucks Shemale
100%
VICKI LARA RIVERA,MY SEXY TRANSVESTITE GF
I met Vicki at a hook up site,she had an ad that caught my attention it went something like this "hispanic transexual looking for a serious relationship with an honest man",i read her ad and liked the fact that she was looking for a relationship and not just a one night stand,I`m very much... Read full Story
shemale lover 2013-07-10 4,443 sucking Shemale Fucks Guy ass fucking Guy Fucks Shemale stroking
100%
Chinese Apple Turnover
I crashed harder than anytime ever in my life and my dreams were fucking vivid. I dreamt of being fucked. And of sucking huge cock and getting face fucked so hard that I was cock drunk and high from holding my breath so much. But so really horny from him doing that, so into that cock. Of Jax f... Read full Story
ASSEaster5678 2019-01-09 6,549 anal sex Shemale Fucks Guy Asian Guy Fucks Shemale
92%
MY TS FOXXY & VENUS LUX FANTASY
Alyssa Gomez and Venus Lux were visiting Newark, NJ and decided to have lunch in the restaurant that I work in. It was a rainy day. The seductive pair were returning back to their suite in the Courtyard Marriott, but not before grabbing a bite to eat. Alyssa and Venus sat the bar and ordered a coupl... Read full Story
I_GO_3WAYZ 2021-03-02 11,236 Latina Creampie Shemale Fucks Guy threesome Blowjob Ass to Mouth cum in mouth double anal
100%
Why I desire transsexual cock
I've thought about what it must feel like to have jus for a bit, a transsexual cock inside you. How ones nervousness is turned into extreme horniness upon seeing her cock for the first time. The thoughts that must race thru your head. How big is her she-cock?. Do I touch it? Do i lick the length of... Read full Story
Curious_billy 2023-01-19 6,928 Amateur Cumshot Bareback Creampie Shemale Fucks Guy Blowjob blonde Big Cock domination Homemade cum in mouth
NEW
GRANNY TRANNY'S HOUSE of SIN
It all began after my husband died and I was living alone. I decided to adopt a family and corrupt their minds. You see, I'm an ex SHEMALE PORN STAR and I like to live a wild life and I figured after my husband died I should relive my wild life and be happy. I reached over for my GOLD METAL MESH CIG... Read full Story
BITCHGURLvr 2024-07-19 760 shemale cum sex Cigarettes
62%
Bobbys Preggo Shemale Turn
This is a story about how a 14 year old normal guy became a sexy 16 year old pregnant Shemale. It has many similarities to real events. Bobby was a normal guy. he grew up in a good family and was fairly popular. One day when he was in 9th grade his class recieved a new teacher. Her name was... Read full Story
shemale lover 2011-08-18 4,637 Big Tits shemale submissive
80%
A Fairy Tale Part 1
=-=-Chapter One-=-= "Heather?" My boyfriend was knocking on the bathroom door. "What's wrong, are you okay? Heather?" "Yeah..." I swallowed thickly and that was a mistake. I threw up some more, kneeling on the floor, feeling like I was dying. "Heather?&q... Read full Story
shemale lover 2011-12-06 11,459 Bareback cum ass fucking slave
100%
Admitting My Secret Part 2
"Get on your fucking knees pig," the powerful Dom demanded. I was naked in Master Steven's basement dungeon. My wife Julie was fully dressed and sitting in a chair in the corner of the room watching me submit to a man. I was not gay, but I have always been very submissive and I had rece... Read full Story
shemale lover 2011-12-11 3,762 sucking shemale
88%
Me being a pet
As you all know i am a bitch of my mistress "sissychick". This incident happen recently during my training of being a little slut. So i was sitting right next to my mistress bed, like a loyal dog, still having anal plug inside my ass and my dog collar. It was the mark of me being my mistr... Read full Story
shemale lover 2013-05-07 5,026 sex toy anal sex Shemale Fucks Guy domination cum swallowing
70%
A day to remember
so I'm on a business trip and decide to call an escort to make this trip worthwhile. set up a time for an afternoon date call when I get to the parking lot. she answers the door in a nice skirt and top on invites me in and we procede to her bedroom. from there stood the sexiest black tgirl Ive ... Read full Story
BlkCockJockey 2018-04-17 6,320 Shemale Fucks Guy Big Cock Ebony Interracial
96%
A Night of Lust
I was out at a night club with a few friends, and we were there for for a while before I noticed this sexy, rather short girl across from me at the bar looking over. I could tell, even from this distance that there was something special about her, I wasn’t sure what that was quite yet though. The mo... Read full Story
JessicaEdwards 2018-08-07 18,215 Stockings Amateur Cumshot Masturbation Bareback Creampie Shemale Fucks Guy Blowjob blonde Big Cock Lingerie deepthroating Guy Fucks Shemale cum swallowing deep throat deep penetration cum swapping pov Ass to Mouth cum in mouth anal fuck sloppy virgin ass
98%
When Fantasy Comes True 2
After my first threesome encounter with Jenni and her friend, getting a golden shower from three trans women was a bonus. Being drunk and now four of us snuggled in bed, i thought the night had ended but i did hope for more. I was not disappointed as Jenni's friend (Sasha) who had been sleeping d... Read full Story
Sara Banks 2018-10-22 11,698 Group Sex Cumshot Bareback Shemale Fucks Guy threesome Blowjob Big Cock gangbang domination Ass to Mouth cum in mouth golden showers golden shower
72%
The Weekend
The weekend A story inspired by the very sweet and sexy samantha satine and my beautiful wife Part 1 - The preparation samantha packed her suitcase with her usual attention to detail, makeup, lingerie, wigs, but no dresses. Her head was confused by this, Master D had given her instructions... Read full Story
MasterofSissies1 2018-12-04 8,652 anal tranny Stockings Crossdresser Group Sex gangbang oral domination Guy Fucks Shemale transvestite schoolgirl School uniform maid uniform
100%
Bimbo Bombshell - Chapters 1-2-3
Bimbo Bombshell - Chapter One: Singled Out! Even though it was Friday, the bar wasn't particularly crowded that night. I never knew what hit me. This Gorgeous Blonde bombshell, starts flirting with me right a my table. I found myself wondering why this glamorous beauty, had chosen me. I was... Read full Story
Hardrock51Fifty 2024-06-23 4,535 Stockings Big Tits Shemale Fucks Guy Fetish Blowjob blonde domination Guy Fucks Shemale blonde shemale PDA Public Displays of Affection
83%
Did I Do Right By Taking Money For Sex?
I first properly dressed when 14. (I did do the knickers and stockings and pantyhose thing previously from when I was 11). I first had sexual contact with a friend when we were both 14, i.e. wanked each other then I sucked him off and drank all his cum. I then waited until I was 16 for sex with... Read full Story
Linda Tiffany Vista 2024-05-07 2,751 anal Blowjob blonde Lingerie shemale fucks shemale cum in mouth teen (18+)
50%
Liberty meeting, chapter1
On a beautiful summer day, my phone rings. It's Steve, the boss of a transvestite company who calls me. - Hello Sandra, I have four new friends waiting for you at the club. - Thanks for thinking of me, I'll be right there, I said, hanging up. I am happy with his call because I always meet ... Read full Story
sandratvtg 2024-06-20 1,072 Stockings Shemale Fucks Guy Fetish Lingerie shemale + shemale
100%
My disturbing experience with the elastrator,
My disturbing experience with the elastrator, Every year in the USA but also in France, many males tired of being forced to get hard or no longer wanting to be slaves to their hormones seek out dominatrixes who castrate them clandestinely to better dominate them. They use the elastrator for th... Read full Story
sandratvtg 2024-06-25 860 anal Lingerie Guy Fucks Shemale femboy pumps Castration élastrator stoching split pantie
25%
As Mistress Commands
I remember the first time I was exposed to this world. I was 20, and in my 2nd year of college, majoring in aviation technology. I had been studying my brains out for a paper when I decided to take a break and have some good naughty fun online. I took out the notebook and was goofing off in the chat... Read full Story
shemale lover 2012-01-04 6,033 bdsm cum oral humiliation
100%
Barbie Jo Adventures Part 6
Saturday When I woke up, I was alone in Harley's bed. I went to the bathroom for the usual thing when you first wake up in the morning. I looked at myself in the mirror and saw me, a guy. I felt embarrassed being in Harley's house with no makeup on. I had a quick shower, borrowed Harley's razor t... Read full Story
shemale lover 2012-02-18 4,332 cum oral face fucking
93%
Surprise
Brad was at the park one Saturday afternoon playing softball with his buddies when he spotted Morgan, a gorgeous tall thin blonde sitting on a nearby bench. Brad accidentally lost the ball near where she was sitting and had to go get it. The softball game had wrapped up and everyone had packed up th... Read full Story
shemale lover 2013-03-05 16,879 hardcore sucking Shemale Fucks Guy Blowjob ass fucking
97%
Purple Kiss, part 3
Continued... As I reached out for Tiffany's hand, she snagged the towel I had wrapped around my waist and threw it to the floor, “no need for that, cumslut.” The group of women surrounding the doorway applauded once again then dispersed. Most of the women headed downstairs, but Janet, Kimb... Read full Story
Transadmirer 2016-01-15 7,126 Shemale Fucks Guy Fetish Blowjob cum gangbang domination
80%
My sisters Tgurl friend Part Deux
Next day, after my incredible sex encounter with Christy , my sister let me know that her friend was a Tgurl. I acted like I was shocked. She told me that Christy was a friend from college and had breast implants and took some hormones to be more feminine, but she still had a dick. My sis told me th... Read full Story
Brett1 2017-06-27 10,187 tranny Shemale Fucks Guy blonde ass fucking deep throat
100%
Incubator
For lack of a better term, I will call him my Lover. I call him Grae, which sounds like "gray" if you are doing a rather poor impersonation of a Scotsman. Not that I have anything against the Scots; that's just as close as I have been able to come to pronouncing his real name. You would think that s... Read full Story
ASSEaster5678 2019-04-23 4,545 Big Tits Bareback Shemale Fucks Guy Big Cock Guy Fucks Shemale monster
66%
Laufhaus Besuch bei Wunderschöner Tranny
Hallo, heute möchte ich von meinen zweiten Besuch bei einer Tranny berichten, das erste mal war leider nicht so toll wie das zweite mal, vielleicht schreibe ich ein anderes mal darüber. Ich war in Graz bei einem Laufhaus bei TS Stefanie, über sie habe ich in einem Forum nur gutes gehört und habe ... Read full Story
johnschmit 2019-10-24 7,738 Big Tits Shemale Fucks Guy Blowjob Guy Fucks Shemale cum in mouth
66%
I love Shemales
Ever since I was 13 I have had a thing for shemales. I had always wanted yo experience sex with a shemale. So when I was 20 I decided to get on an escort site and find a sexy Tranny. I ran across the perfect one so I immediately booked a date with her. So the dreamday finally came and I was so excit... Read full Story
Weinerboy6969 2020-01-29 9,257 Creampie Shemale Fucks Guy cum in mouth
85%
My Knight
I felt good as a looked around the club and watch the Queens on stage perform their acts. I felt like I belonged here among this faction of society. Drag queens and Trannies were my people and the only thing I regret is being in the closet and not having the courage to do it more openly. However i d... Read full Story
Regina10 2020-06-23 3,813 Bareback Guy Fucks Shemale Ass to Mouth shemale + shemale
75%
Honeymoon Suite 2
Jason is on the phone with room service, while I am about to change out of my wedding gown. I had just got married, and I was now the blushing bride. Yes I got married. I was nervous now and my pussy was burning, because of the crazy bet we had made about not having sex a week before the wedding. We... Read full Story
Regina10 2021-02-22 3,632 Stockings Crossdresser Big Tits Cumshot Bareback Creampie Blowjob blonde Lingerie Guy Fucks Shemale Ass to Mouth cum in mouth
100%
First time with big surprise
My first story translated into English, I hope you like it. It was late at night, I had been drinking with friends and was on my way home. I am a man in his early 30s, smartly dressed and looking quite attractive. The night was beautiful, clear sky, warm and in the city were some people on the ... Read full Story
Marten1201 2023-01-06 6,767 Big Tits Bareback Creampie Shemale Fucks Guy blonde Big Cock
100%
Alessia and the Twins
Alessia and the Twins When the politician David Smallwood awoke that morning his thoughts immediately turned to Alessia, and he started to daydream about her, as he was wont to do now. He had several meetings scheduled for that day, including a rally promoting restrictions on gay and trans-gender... Read full Story
Alessia Travestita 2023-07-21 5,249 Crossdresser Blowjob Big Cock Shemale and Girl shemale fucks female
50%
Hard Decisions by Elaine © 2020
Hard Decisions by Elaine © 2020 No one in this story is based on anyone alive or dead. It is a work of fiction and should not be read by minors. I appreciate the kind efforts of many of my friends who cast a welcoming glance over the initial writings. I owe you all a big debt of thanks. Prolog... Read full Story
Elainetguk 2023-09-06 4,785 Stockings Big Tits Creampie Lingerie Guy Fucks Shemale Mature
50%
The first requirement of a deal with Dominatrix Persephone.e
There was a number of requirements before I even consider'd fucking that sissy ass, firstly, I expected dedication to be shown and to prove that the sissy could obey my orders, after a trial period, then I consider to force my big dick down the throat of the that sissy, and then fuck brutally and ex... Read full Story
Dominatrix Persephone 2024-06-21 1,112 anal solo Cumshot Masturbation Shemale Fucks Guy Big Cock Shemale and Girl domination Mature sissy shemale fucks shemale teen (18+)
83%
Jesse’s Dream Job
****This a fantasy scenario i have dreamed of ever after i became interested in beautiful Ts women. Even though this is my fantasy alot of credit goes to author Ruwild (which some of u may have read his stories) who was nice enough to write the story for me. Enjoy!!!***** Jesse's Dream Job ... Read full Story
AlcatrazNYC 2011-11-19 7,934 Shemale Fucks Guy cum swallowing
100%
Amatuer Strip Night Chapter 2
Sasha stood in her bra and panties looking nervously out over the crowd at the topless strip club. She shuffled her feet and looked down, her blonde hair covering her face and she wondered to herself if coming back out onto the floor had been a good idea at all. Sasha had just won first place at ... Read full Story
shemale lover 2012-10-21 3,784 Cumshot shemale oral sex cum swallowing
96%
Trisha
The doorbell dinged. It was my next door neighbor Pete. I had known him since I moved into these condos two years ago. We met at one of the monthly parties our association throws. That one happened to be a barbeque and I remember the dish he brought to the potluck was amazing. Pete was always trying... Read full Story
shemale lover 2013-02-06 10,552 sucking Shemale Fucks Guy ass fucking doggy style big boobs