Sort by
Relevancy

Free Stories

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 11,796 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
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 6,968 Cumshot suck Shemale Fucks Guy Ladyboy ass fucking swallowing
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 7,551 Teen (18+) Small Tits Amateur Group Sex Latina Blowjob gangbang Guy Fucks Shemale cum in mouth
36%
Nice guys finish last!!!
Wish I didn’t get rejected from so many females in my life and having more as friends!!! It makes me wanting to give up male pieces and wanting to be more female then male. All the time the thoughts flooding my mind about cutting my penis off and starting over!!!... Read full Story
matjohn 2019-08-20 3,466 Crossdresser Big Tits Bareback Creampie Shemale Fucks Guy Fetish threesome Ladyboy redhead shemale + shemale
100%
My 1st Time was Not the Only Time.
One late night after hitting the slopes and partying I left my friends birthday party feeling extra horny. It was about 6 or 7 in the morning now and after having no luck finding an escort I responded to an ad on craigslist posted by a trans woman. I figured two things, this dick isn't going to suck... Read full Story
LesFuax 2019-02-16 9,065 first time Small Tits Amateur Latina Bareback Creampie threesome Blowjob Big Cock ass fucking barebacking barebackedshemales first time with a tranny raw anal raw dick raw fucking firsttime
100%
Threesome goes clubbing
Ft. Lauderdale is probably the most LGBT friendly city on the east coast. So many nice restaurants and clubs that welcome all and have many LGBT employees as well. Lydia and I have been married several months, we had met Joanne an absolute amazing transgender girl during a weekend trip to the Baha... Read full Story
Jon Paul 2021-07-08 5,210 Big Tits Cumshot Bareback Creampie threesome 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 6,493 Big Tits Cumshot Latina Bareback Creampie Shemale Fucks Guy Blowjob Asian Ladyboy Guy Fucks Shemale
90%
Sissy Slut and Stepdads
Frank was pumping me hard and his huge cock seemed to have grown and become extra hard. I am so thrilled that way he enjoys fucking my ass with such passion. I would almost think he was in love with me if this relationship wasn't so bizarrey. It’s ironic that as a male I always get total humiliation... Read full Story
Regina10 2020-11-30 9,196 Crossdresser Bareback Creampie Fetish Blowjob blonde Big Cock Ladyboy Lingerie Guy Fucks Shemale Ass to Mouth double anal
85%
BANGING AROUND BANGKOK
BANGING AROUND BANGKOK: THE AMOROUS ADVENTURES OF CAITLIN "MEOW" MORRISON after living and working in Thailand/SE Asia for many years i decided to write an erotic story based on some of the people i have known, venues and places i have been, and the P4P night-scene where i spent way too much... Read full Story
bkkldby 2019-06-17 14,043 first time Teen (18+) Amateur Group Sex Big Tits Cumshot Outdoor Bareback Blowjob Big Cock Asian lesbian public place
100%
A Perfect Pandemic: A Transsexual Transition in a Troubled Time
A Perfect Pandemic A Transsexual Transition in a Troubled Time A Novelette by Alexandra Rios Text Copyright Reserved © August, 2021 Dedication Transgender Day of Remembrance is a solemn occasion. I am offering “A Perfect Pandemic” for free as an antidote to the fear, phobia, discrimination, d... Read full Story
the greatest liar 2021-11-16 5,072 Teen (18+) Crossdresser Group Sex Big Tits Bareback Creampie Big Cock gangbang domination Guy Fucks Shemale Interracial double anal webcams
100%
Being taught a lesson .......... I think!
How did I end up on my back in my own bed, legs straight up with my ankles over her shoulders, ready to have my ass fucked from a lost bet? A bet that Alma clearly cheated at as we discover. I was off to Thailand for a 16 week course in Thai massage at a school recommended highly by a friend I ha... Read full Story
Curious_billy 2023-11-12 8,139 anal Amateur Group Sex Bareback Creampie Shemale Fucks Guy threesome Big Cock domination Homemade Vintage cum in mouth
100%
Florida TG Experience
I had known Jan from High School, we always had an attraction for each other but were dating someone else or married at the time. Jan had actually married a friend of mine and I was envious of course. She at that time had sandy blonde hair, and a body to die for. One evening we had them over for dr... Read full Story
Jon Paul 2018-08-13 10,873 Group Sex Big Tits Bareback Creampie Blowjob blonde Asian Ladyboy Shemale and Girl Guy Fucks Shemale Ass to Mouth cum in mouth double anal
100%
The Experience of a Lifetime
My divorce was hitting me really hard. My wife outgrew our relationship and started living her own life and I had a front row seat to everything. My heart and life was upside down. I didn’t go out anymore. Friends and family both told me it was time to get my life back on track and start living ... Read full Story
therefill05 2020-11-30 19,990 Big Tits Cumshot Bareback Creampie Shemale Fucks Guy threesome Blowjob blonde Big Cock Ebony Uniform domination cum in mouth
100%
Hung Trans Lesbians Fuck Two Ladyboys
Note 1: If you like Transsexuals, Trans Lesbians, Asian Ladyboys, Big Cocks, Extreme Cock Sucking, Anal Fucking, Anal Fisting, Semen Swallowing, Role Play, Orgies, BDSM, Cock Sounding and Foot Fetish this story is for you. Note 2: All the characters are over 21. The names are fictitious, but some... Read full Story
darrell 2022-01-03 4,275 Group Sex Big Tits Cumshot Bareback Fetish Blowjob Big Cock Asian Ladyboy Sex Toys Mature cum in mouth shemale + shemale
75%
Passion in the Rough
Tonight, I was searching in vain for a parking place close to the club, but unfortunately, I had arrived late and there were no empty spaces close by. I drove around and went down several streets in the same block until I found an empty spot. That was perfect I thought as I found a parking place and... Read full Story
Regina10 2024-04-27 3,215 anal Crossdresser Big Tits Outdoor Bareback Creampie Blowjob blonde Big Cock Ladyboy gangbang Guy Fucks Shemale
80%
Becoming Alanna Part 2
Walking into room number one, she told me kindly to strip nude and climb into the chair. I did as I was told and hopped in to the chair. I fit my feet and legs into the stirrups and she spread them apart exposing my cock balls and asshole. She looked me up and down and smiled "not much work wit... Read full Story
shemale lover 2012-07-12 3,848 sucking Fetish Ladyboy rimjob
42%
Becoming Alanna Part 1
My name is Alanna Monroe and i am currently a college bound 17 year old senior at St. Anne's school for girls in Middletown Conn. I was once Alex Monroe, but after one fateful day four years ago, I became Alanna. Being a proper “lady”, i have all of the assets of my classmates...well tha... Read full Story
shemale lover 2012-07-12 4,816 shemales Ladyboy
100%
Dear Karen Chapter 4
#4 05.18.09 Dear Karen, You helped me explore the fantastic feelings that breasts can produce when properly handled and I yearned to replicate the feelings that you elicited from my tits. So, since my last letter I have been training BJ to be the consummate breast lover. I have coached him in ... Read full Story
shemale lover 2012-08-06 2,471 Fetish feminization sissy husband
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 10,714 Big Tits Cumshot Bareback Creampie Shemale Fucks Guy Blowjob Big Cock cum in mouth
91%
HOW MY AUNT AND SISSY NEPHEW CHANGED MY LIFE FOREVER! (fictional
It was the very first night of my month long North Carolina July summer vacation stay when my Aunt Meg suddenly entered the bedroom that I was temporarily sharing with my younger cousin Rudy. Being so openly effeminine in his body language,voice and looks, I had already planted such dirty thoughts ... Read full Story
CDDIXIE4U 2019-01-08 33,660 Teen (18+) Crossdresser Cumshot Masturbation Bareback Shemale Fucks Guy Fetish Blowjob Big Cock Ladyboy Lingerie domination Homemade Compilation cum in mouth shemale + shemale
100%
Lola Chapter 5
Lola chapter 5 Summer vacation was coming to an end. Most of the time we had been to ourselves, mostly at home but also a couple of shorter trips. Beer tasting in Stockholm's archipelago, a trip to the west coast, overnight stays in hotels, everywhere we were received like any other couple. A fam... Read full Story
BellaBeau 2023-10-30 5,693 anal Cumshot Latina Bareback Creampie threesome Shemale and Girl Lola
50%
Twisted
"Baby, are you sure this is the place?" Eve squealed a bit too loudly, her voice both high-pitched and thick from the third Cosmopolitan. "This looks so, I don't know; fancy-shmancy for a full on mix-it-up ladyboy bar. I know, I know, this is South Beach and everything here is la-de-d... Read full Story
shemale lover 2011-10-31 4,832 shemales Big Tits fingering oral sex
100%
Masturbation fantasies 2: Looking for Amanda
Previously: William, a young lawyer who has no luck with women, decide he needs some relief from a live girl. Scared of going with a prostitute, he decides to try out a peep show first. Without knowing that the stripper he chose is kind of special, he ends up in a show with a shemale called Amanda w... Read full Story
ThatEroticWriter 2019-07-24 8,848 Big Tits Cumshot Masturbation threesome Frottage
80%
TG Girlfriend moves in (part 2)
My wife Lydia and I have been married about 9 months, we have a very close TG friend, Joanne, that lives next door and every once in a while, we get together, and all go out and enjoy. We have had sex together, and when Lydia is away Joanne, and I are together at every opportunity. Joanne and I work... Read full Story
Jon Paul 2022-01-21 3,412 Big Tits Cumshot Bareback Creampie threesome Blowjob Shemale and Girl Guy Fucks Shemale
75%
Rebound
My story is nothing new, like most girls who used to be boys I knew from an early age that I was different to all my school friends. My dad was a thug of a man, who enjoyed the physical battle of the rugby pitch as much as the post match booze up, but I took after the mother who died giving birth to... Read full Story
shemale lover 2011-11-25 6,165 anal Creampie oral
100%
Beefy Buns
It's hard to get good help. Probably, that's true in any business, but it's especially difficult to find decent employees in the fast food racket. Believe me; I've tried. I manage the local Beefy Buns franchise--burgers, fries, and shakes is our mainstay, but the menu also features fish and chick... Read full Story
shemale lover 2012-04-22 6,056 anal sex Creampie blonde shemale
100%
Exotic Escapades Chapter 3
The smell of wood and coffee filled the quiet house as Tammy slowly picked herself up from a plush couch. Daggers of sunlight blinded her eyes as she eventually got on her two feet. Her body ached, and she noticed a small pink bandage on her left leg. The terror and pain of last night shook her as s... Read full Story
shemale lover 2012-05-05 2,974 tranny Creampie Big Cock Ladyboy fingering oral sex
100%
Angel Chapter 2
Angel Jones stepped off the train and hoped she was in the right place. It was noisy and confusing in the terminal, a far cry from the relatively quiet station in her home town where she had boarded the train that morning. One hand clutched a small suitcase that contained her makeup and clean linger... Read full Story
shemale lover 2012-11-30 4,207 oral sex tgirl feminization
66%
Samantha sissy TGTF
Theme and genre of the story: The genre is about gender bender, futanari, gay, physical transformations of the body, magic and biology, the kink in particular that must excite in the story is the perversion of the transformation of the body and mind through a magical element that manipulates biol... Read full Story
Samantha sissy world 2022-09-20 4,539 Teen (18+) Crossdresser Big Tits transformation transgender feminization pov sissification Cartoon magic Gender Bender
100%
A Fairy Tale Part 2
=-=-Chapter Six-=-= I woke up sometime later and I was feeling better, even a little hungry actually, and I wanted a shower and I needed to pee and...I cocked my head as I heard the unmistakable sounds of Mistress Stacy's bed moving. She had a large one, king sized, with old springs or somethi... Read full Story
shemale lover 2011-12-06 6,683 Creampie Big Cock ass fucking
85%
True story, TS 3-way
This is a true story. It was a typical night in Pattaya Thailand and I'm still recovering from the 25 hour flight from Tennessee to Bangkok that I flew just days before. After a few days in BKK, I arrange for a hotel car to me to Pattaya, a seedy explosion of lights, blaring music and drunken ... Read full Story
Thailover 2014-03-11 9,694 Cumshot threesome jerking ass fucking facial stroking
90%
Saving My Marriage
I love to write Erotica. For story requests please send me a private message or email noirenoire10@gmail.com It was our anniversary. Today made five years that my wife and I have been married and we were taking a road trip to celebrate. I chose our destination but I let her choose all of our a... Read full Story
therefill05 2021-02-16 6,033 Cumshot Bareback Creampie Shemale Fucks Guy threesome Blowjob Big Cock Ebony domination Sex Toys cum in mouth
100%
The four of us
Jan and I have been together now about 4 years but known each other since High School. We are both in our early fifties. We had met a transgendered girl (Gabby) about a year ago and we get together about once a month and enjoy each other’s company, going out playing and having intimacy together. Gab... Read full Story
Jon Paul 2021-08-02 4,141 Group Sex Big Tits Cumshot Bareback Creampie Blowjob Big Cock Guy Fucks Shemale Ass to 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 3,100 Shemale Fucks Guy Blowjob Big Cock Ladyboy Guy Fucks Shemale shemale fucks shemale Fantasy Tale
100%
Working for a Living Chapter 6
I slid out of the old Ford truck driver's side door. Surprisingly, my legs felt a bit shaky as my feet hit the concrete driveway of the Malibu mansion. I nervously straightened my cut-off shorts as I walked around the truck. She was waiting by the tailgate with a big smile on her face. "Wow Jai... Read full Story
shemale lover 2012-10-05 3,556 Group Sex Creampie threesome
94%
The Double Sex For Sissy
Jeff Malville awoke slowly, moaning softly. He almost forgot where he was in that moment where sleep and being awake clashed. However, after that split second, it all came rushing back and he moaned in delight. He was a captive on the Double D Ranch, and even though he was considered an employee... Read full Story
shemale lover 2013-04-10 7,614 Creampie threesome blonde redhead domination double penetration
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 5,687 Bareback Creampie Shemale Fucks Guy Blowjob Big Cock gangbang domination cum in mouth
100%
How I Became His Office Fucktoy
Until this job ended last year, every day at my lunch break I would service one of my many Daddies in his office in the building where I worked. He'd always slip me a few bucks, a $20 or even $50 afterwards, not as a payment for sex, but as a "tip" "for all the hard work you do here," he says. I wor... Read full Story
Chrissy Tunnell 2022-02-18 3,671 Crossdresser Amateur Fetish Blowjob Ladyboy domination Guy Fucks Shemale Mature cum in mouth
50%
La bonne chair masculine…
La bonne chair masculine… La brise caressait mes mamelons gonflés me donnant des frissons agréables. Les deux verres de Riesling avaient également contribué à mon excitation. Mon entre-jambe brûlait comme si le soleil qui disparaissait avait soufflé toute son énergie thermique dans mon intérieur... Read full Story
hippocampus_171 2023-04-23 895 anal Small Tits Amateur Creampie Blowjob Mature small cock big ass feminization cum in mouth gaycd virile
33%
Shemale සුසී
සුසී කියන්නේ Shemale කෙනෙක්.එයා ජොබ් එක විදියට කලේ ඇග විකුණන එක.සුසී ගැන කියනවා නම්,එයාගේ දෙමව්පියෝ නෑ.හැදුනේ වැඩුණේ ආච්චි ගාව.අවුරුදු 15 වෙනකොට ආච්චි අන්ත්‍රා වුනා.සුසී තනි වුනා.එයා කඩේක වැඩට ගියා.කඩේ මුදලාලි අතින් සුසී අතවරවලට ලක්වුනා.ඒත් කඩේ මුදලාලිගේ වයිෆ් සුසීට හුගක් ආසයි.සුසී කෙට්ටු කොල්ලෙක් ව... Read full Story
Malinda89 2017-11-24 9,660 Small Tits Crossdresser Creampie Asian Ladyboy domination
88%
Seattle Weekend
Saturday morning and such a beautiful day nice and cool morning I went for a run. I consider myself in fairly good shape for my age but I try and make it to the top of a hill in our neighborhood. I get winded fairly quickly. Coming down the hill I ran into a nice looking athletic girl, maybe 38 year... Read full Story
Jon Paul 2018-08-09 10,021 Big Tits Cumshot Bareback Creampie Blowjob Ladyboy Guy Fucks Shemale cum in mouth
100%
Sissy Slut Reunion
Rob had moved back to town and called me. He had just moved into his new place and he wanted me to come by and talk. I knew what he really wanted from the tone of his voice, because I wanted it too. He said he had been thinking and dreamed about me the whole time he was away. My spirits lifted and ... Read full Story
Regina10 2020-09-14 4,134 Crossdresser Big Tits Cumshot Bareback Creampie Fetish Big Cock Ebony Ladyboy Guy Fucks Shemale Ass to Mouth cum in mouth
81%
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 7,104 Teen (18+) Small Tits Amateur Cumshot Outdoor Bareback Creampie Fetish Blowjob Asian Ladyboy Mature
100%
The Biology of Music - I fucked my trans substitute teacher
I was never strong in school. I wasn't very interested in what we were being taught, and the teachers liked me enough to not give me too hard a time about it. I attended an all boys school. It was actually quite a religious school which makes this story all the more surprising. I was in the middle c... Read full Story
terrifictim 2022-01-03 3,812 Creampie Guy Fucks Shemale feet licking first time with a tranny teacher student
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 5,104 Amateur Cumshot Latina Masturbation Bareback Creampie Shemale Fucks Guy Blowjob Ladyboy Guy Fucks Shemale cum in mouth
94%
The Girl Next Door Ch. 01
derezzed Michael was your average 21-year-old college student. He was on his way home from college for summer break after finishing his finals and looking forward to a few months of relaxation. Driving home Michael reflected on his past three years of college. It had been a great junior year. H... Read full Story
Gwapo67 2022-05-13 6,690 Bareback Creampie Big Cock shemale + 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 4,734 Bareback Creampie Shemale Fucks Guy Blowjob Big Cock Mature cum in mouth
75%
Sissify Your Boyfriend Manual - transation
original= manual-sissificar-a-tu-novio-4979 Used google translate, found some pronoun/object/context issues, and I believe ladybug = ladyboy Sissify Your Boyfriend Manual MANUAL FOR WIFE/GIRLFRIEND TO SISSIFY YOUR MAN, DISCOVER HIS SUBMISSIVE SIDE AND TURN HIM INTO ?HORNAND? AN... Read full Story
shelli_k18 2021-04-20 8,327 femdom sissyboy sissification sissy training FLR hotwife guidelines Modern Marriage Power exchange
50%
The Greatest Lie Part 15
I think that if you could get honest answers, a lot of heterosexual guys would probably admit to having had at least a passing desire to be a girl. If they were honest, they would probably admit they thought of it "when I first noticed a girl's breasts" or "when I first felt a girl or... Read full Story
shemale lover 2012-01-20 6,151 anal hardcore erotic encounters fantastic
100%
A Schoolgirl Story Chapter 2
I must apologise for the amount of time that it has taken for the second chapter of this story to come out. I have to admit that I had kind of abandoned it, but all your lovely feedback comments made me decide that I couldn't leave this one hanging. So thank you to everyone who wanted more of Wendy,... Read full Story
shemale lover 2012-06-05 8,450 Group Sex Cumshot oral sex assfucking
80%
Brazilian Discovery Chapter 4
John, the husband of Susan (see Susan and John series) has travelled to Brazil for a one year training session. Mr Gupta has sent him as the pretty little Joan, in the hope he would lose any interest for Susan and leave him totally free to deal with his senior accountant! The corset maker had bee... Read full Story
shemale lover 2012-08-25 4,090 cum oral huge cock brazilian
80%
Debbie Part 7
As Debbie was led into Dr. Jacobsen's office, she saw that Mistress was already there waiting for her. "Your property Miss Chamberlain", the doctor proclaimed, indicating Debbie. Debbie's heart began to flutter with love and submissive fantasies as she saw Mistress. Mistress was dressed in... Read full Story
shemale lover 2011-12-23 9,524 transgender toys bondage and discipline heavy
65%
Marcia Goes Back to School
Marcia was painfully nervous. She hadn't been able to eat very much in days. The upside was she was even skinnier which would make Mistress and her husband very happy. She'd always been thin and on the diet Mistress Carol had her on she was already thinner than she dreamed possible. Her anxious stom... Read full Story
shemale lover 2012-12-19 10,527 Masturbation Blowjob blonde ass fucking big boobs
50%
DATES NUITS
My wife, Denise, and I have been happily married for over 10 years. Over the years, we have enjoyed a vibrant and adventurous sex life. As we've grown in our marriage, we have become very open and honest about our sexual fantasies and desires. Through the years, we have come to realize that my w... Read full Story
Femboy 2021 2023-02-07 1,296 Stockings Lingerie Shemale and Girl Guy Fucks Shemale Interracial Sex Toys cum in mouth
87%
Headmistress' Favorite Sport Part 3
There was no more time for Denise and Susanna to get over their chemically induced bout of incestuous activity as Denise was being sent to school. This was of course part of the plan. Slaves should always feel guilty about something and once their slave training was over, neither would be able to ma... Read full Story
shemale lover 2011-12-12 6,217 toys bondage and discipline chastity belt
100%
The Society
I met her during the summer. I was only nineteen and working to save some money for college. I had been raised by my grandparents who had both passed away over the past year. After the burial costs I was far from wealthy. My parents weren't around so I was on my own at a young age. I had moved a cou... Read full Story
shemale lover 2013-01-10 17,239 Crossdresser sucking Big Cock ass licking big boobs