Sort by
Relevancy

Free Stories

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 8,896 Big Tits Cumshot Masturbation threesome Frottage
50%
Histoire d'une fille qui n'en est pas un
Les années d'enfance Je suis née le 25 décembre 1993, à 11h45 du soir. Je commençais donc par gâcher le réveillon de mes parents. Non ils étaient heureux disent ils. Ma sœur était née depuis 2 ans. Je ne me rappelle plus mais j'ai du être choquée quand j'ai vu tout ce bleu pour m'habiller, dans... Read full Story
Femboy 2021 2023-01-27 987 Stockings Teen (18+) Crossdresser Cumshot Blowjob Big Cock 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 8,476 Big Tits Cumshot Masturbation Uniform Frottage
100%
How I Became Chrissy the Caged Sissy
I am a sissy, or femboy, or tgurl, or shemale? Well either way I like wearing female clothes and being treated like a girl, especially in the bedroom, and now I also like being locked up in a chastity cage that I wear 24/7 now. This is the story of how I became a caged sissy: "Put it on and ... Read full Story
Chrissy Tunnell 2022-01-27 4,170 Crossdresser solo Amateur Masturbation Fetish Blowjob Ladyboy domination Guy Fucks Shemale Sex Toys Mature Homemade
50%
VICTOIRE DOMINANTE OU REDDITION DE POULE MOUILLÉE
Il y eut l'obscurité, puis une faible lumière rougeâtre et enfin, après un ou deux accrocs pénibles, je me trouvai soudain dans une pièce en pierre parée de rose tout ce qui était suffisamment sûr pour que je puisse comprendre ma situation. Après avoir trouvé un ticket en or dans ma boîte de Kro... Read full Story
Femboy 2021 2023-02-03 733 Stockings Crossdresser Fetish domination Guy Fucks Shemale Sex Toys
50%
Pa-mie sex-agénaire
Luxure frénétique d’une pa-mie sex-agénaire; entre rêve et réalité Je n’avais jamais fantasmé de mec viril, même après avoir offert ma virginité; mais à une fabuleuse sissy. Avant mon Ѐre, mes préférences de fantasmes étaient toujours avec des lui-femme glabres, idem concernant mes relations d’aprè... Read full Story
hippocampus_171 2023-07-09 847 anal Amateur Group Sex Guy Fucks Shemale Sex Toys Mature small cock big ass sissy femboy Ass to Mouth
100%
Unconditional Love Chapter 8
After a two' hour nap, Alison and I awoke and the first thing we did was make our way to the bathroom to freshen up. I started up the hot water and climbed into the shower and' once she finished relieving her bladder Allie climbed in with me under the hot water and we embraced each other. We kiss... Read full Story
shemale lover 2013-02-04 6,330 anal sex Cumshot Masturbation Blowjob Guy Fucks Shemale
100%
DÉBUTS INNOCENTS
"Avez-vous pris votre vitamine, ma chère ?" Ellen a appelé de la salle de bain. Je me frottai le sommeil des yeux et ramassai le flacon de pilule, roulant un gros comprimé dans ma paume. "Ma pilule de cheval ? Je le fais maintenant." "Avez-vous déjà remarqué une différence ?" "Non. Les vitamines ... Read full Story
Femboy 2021 2023-01-26 1,098 Stockings Teen (18+) Crossdresser Cumshot Fetish Blowjob Big Cock Lingerie Shemale and Girl domination Guy Fucks Shemale
100%
My Noisy Upstairs Neighbors Part 4: Getting Pimped Out
"Hey bitch," Paul said with his now routine greeting to me standing at my apartment's front door. "Lets talk." And as also routine with him now, Paul just marched passed me like a boss to my bedroom. I closed the front door and joined him there. "First off, get naked," he demanded. "Um..what?"... Read full Story
Chrissy Tunnell 2024-07-21 720 Crossdresser Bareback Fetish Ladyboy Lingerie domination Frottage sissy femboy shemale + shemale
50%
LA VENGEANCE D'UNE SOEUR ⚧️ ⚧️
"Maman, maman," cria Michael. "Aide-moi!" Mary tourna la tête vers les cris de son fils pour ensuite entendre Melissa crier: "Sortez d'ici, espèce de pervers!" Mary se précipita dans le couloir jusqu'à la chambre de sa fille où elle trouva Michael passant devant elle, suivi de près par une bro... Read full Story
Femboy 2021 2023-03-26 1,094 Stockings Big Cock Lingerie Shemale and Girl Guy Fucks Shemale Sex Toys strapon feminisation du fils SOEUR ET MERE DOMINANTE FILLE ET MERE LESBIENNE
50%
A LA DÉCOUVERTE DE L'AMBRE ⚧️
J'ai toujours aimé la lingerie féminine. De regarder des catalogues à voir des copines le porter, j'ai adoré le look et la sensation de la lingerie sexy et soyeuse, mais pour moi, cela a toujours été plus profond. À 18 ans, j'ai essayé ma première paire de culottes, oh mon Dieu, c'était merveilleux ... Read full Story
Femboy 2021 2023-02-17 1,045 Stockings Crossdresser Cumshot Bareback Fetish Big Cock Lingerie Shemale and Girl domination Guy Fucks Shemale Sex Toys
100%
LES ÂMES PERDUES ⚧️ ⚧️
Le lycée est un endroit compliqué avec différents groupes de personnes qui luttent pour trouver leur chemin dans le monde. Qu'il s'agisse d'étudiants de première année qui viennent d'emménager dans un nouvel endroit inconnu et effrayant, ou de seniors qui sont maintenant de jeunes ad... Read full Story
Femboy 2021 2023-03-21 902 Fetish Blowjob Big Cock cum in mouth shemale + shemale emo
50%
UN GROS EFFET SECONDAIRE ⚧️ ⚧️
Je me suis réveillé en me sentant comme tous les matins pendant des mois, extatique. Il n'y a pas d'autre façon de décrire ce que je ressens quand je me réveille le matin. Je me suis levé de mon oreiller, j'ai déclenché l'alarme et j'étais hors du lit en quelques secondes. Je ne ... Read full Story
Femboy 2021 2023-03-21 651 Fetish Blowjob Big Cock Futanari cum in mouth shemale + shemale
100%
Groped on the Bus!
In real life I do not crossdress in public, I am not yet comfortable being my true transgirl self, I wear normal men's clothes and I look like a guy. So I look very different from my persona here. So...there I was standing among dozens of strangers at a bus stop. I kept looking up from my phone ... Read full Story
Chrissy Tunnell 2023-03-22 5,075 Small Tits Masturbation Fetish Big Cock Ladyboy Guy Fucks Shemale Frottage
40%
Thank Heaven for Little Girly Boys
Thank heaven for shemales (and cross dressers). Without them, erotica might still be sugary and nice, but it would certainly lack the variety that spices up one's sex life. After all, there's only one heterosexual plot (boy meets girl), just as there are but two homosexual plots (boy meets boy an... Read full Story
shemale lover 2011-08-18 4,665 ass cock cunt
100%
Weekend Fantasy
have so many fantasies....the one that gets me lately, is having access to a house out in the middle of nowhere, for a week or weekend, where i can dress up, all day. No one knows of my lustful secret....so the idea of being able to stay this way without thought, gets me so hard and such in the moo... Read full Story
martley 2020-07-20 5,072 solo Amateur Group Sex Masturbation Big Cock Lingerie domination Sex Toys Homemade self sucking cum in mouth double anal shemale + shemale
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 5,168 Teen (18+) Crossdresser Group Sex Big Tits Bareback Creampie Big Cock gangbang domination Guy Fucks Shemale Interracial double anal webcams
0%
Latex succubus
The lights of the city obscured the supposedly brilliant starlight in the night sky, leaving only dim and scattered scattered stars adorning the gloomy night sky half-covered by dark clouds, and the crescent-like crescent moon guarding it in the distance makes the night seem less empty Lonely. Mayb... Read full Story
Alicexiao 2023-01-06 4,358 Crossdresser Cumshot Creampie Fetish domination Guy Fucks Shemale high heel boots
92%
Lola - chapter one
This is a fantasy but with a lot of inspiration from real life experience. More chapters to follow. Chapter 1 So now I knew, without a shadow of a doubt, what it was that caused this familiar smell in my house - and where it came from. When I got back home my laptop was lying open on the kitc... Read full Story
BellaBeau 2023-10-05 5,991 anal Amateur Cumshot Masturbation Bareback Blowjob Guy Fucks Shemale Frottage Homemade
100%
Shawshan part2
The summer weather has finally let up and cool evenings where you need a sweater are among my favorite times of the year. Charlene left now from prison and served her time for drug possession. We had become close friends as well as cellmates over the last few months. She no longer cuts her hair as ... Read full Story
Jon Paul 2021-05-20 3,275 Latina Masturbation Bareback Shemale Fucks Guy threesome Guy Fucks Shemale shemale + shemale
50%
Spy Girl
Vicki stood in the dark doorway as she watched her mark, Ivan Patrinkov, approach up the empty street. There was no way he would be able to see her where she stood in the shadows. She wore a skin tight leather jumpsuit with black low-heel boots. She would have preferred to have on a pair of stiletto... Read full Story
shemale lover 2011-11-09 4,721 anal sex shemale Frottage
50%
Devastating and dominating
Tracy drove the black SUV with her friend Miss K in the passenger side, both of them struggling not to be bored to sleep with the monotonous countryside I-64, the scenery broken up only by the occasional road sign or truck stop. The Madonna CD thumping in the stereo helped matters though, the t... Read full Story
shemale lover 2012-01-29 5,116 Masturbation sucking Creampie Latex fucking
100%
Betrayed Chapter 10
I would have loved to be waiting at the gate at O'Hare when Dianna de-planed from L.A. that Sunday night. I had to settle for the Baggage Claim Area. Those people working for the Transportation Security Administration have no sense of humor. I guess at eight dollars an hour, they can't afford one. T... Read full Story
shemale lover 2012-05-30 4,717 hardcore shemale fuck
100%
Camming Down the Rabbit Hole Ch. 10
As the sun beamed in through a gap in the curtains my now familiar morning wood strained at the silk of my nightwear. How was it that no matter how hard I came the night before it would wake up eager and ready to go. As had become customary my mind would be filled with the events of the previous nig... Read full Story
Dani_does_Dallas 2022-04-12 3,484 Crossdresser solo Amateur Cumshot Masturbation Lingerie Sex Toys Homemade self sucking cum in mouth webcams
0%
Mike and Chris Together
Mike's sex life had taken a definite series of turns for the worse. When he called one of his favorite partners, Stella, she apologized for not returning his earlier calls, and told him she had been very busy lately. "I'm really sorry, Mike. I've had some great times with you, and I will alw... Read full Story
shemale lover 2012-02-07 5,188 anal sex Creampie Shemale Fucks Guy Guy Fucks Shemale
100%
Shemale Solo Tube And Practical Jokes
"Dude, you know I mean you good", my friend John was saying while he was dragging me out of bed, "You're spending way too much time inside and I have a treat for you!" I hated John's surprised - he had all sorts of crazy, stupid ideas, like painting my dorm room in black while... Read full Story
shemale lover 2016-02-22 3,746 tranny tit fucking
86%
The Girl Next Door Ch. 01 by 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. He met a lot of... Read full Story
StevelovesTgirls 2019-05-27 18,085 Amateur threesome Big Cock shemale + shemale
100%
Santa & Mrs. Claus
In my story called "Santa Likes Fembois" here I explained that I discovered that last Christmas when Santa Claus visited my house then made me suck on his cock before fucking my boypussy. He also gave me an actual present: a winning lottery ticket. Well, with that multi-million dollar winning ticket... Read full Story
Chrissy Tunnell 2022-12-01 3,620 Crossdresser Amateur Bareback Fetish Blowjob Ladyboy Lingerie domination Guy Fucks Shemale Mature cum in mouth
100%
From a 50's virgin to a Mature good for all
***Prologue - Confessions: Every day since I offered my virginity, I put myself in the shoes of a woman. The little town where I live forbids me to show myself socially. However I made myself an accomplice, my epilator who receives me after closing. Since my new beginning, male masturbations are not... Read full Story
hippocampus_171 2023-01-11 4,358 Stockings Crossdresser Amateur Group Sex threesome Big Cock domination Mature foursome Homemade cum in mouth shemale + shemale milfs
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 1,389 anal solo Cumshot Masturbation Shemale Fucks Guy Big Cock Shemale and Girl domination Mature sissy shemale fucks shemale teen (18+)
66%
A Girl's Best Friend
The party was in full swing when Ryanna and her friends arrived. Of course, they were an hour late, since Glenys had gotten lost on the way. The house was out in the back woods; the owners didn't exactly go out of their way to make it easy to find. Their fellow townspeople probably would have frowne... Read full Story
shemale lover 2012-03-06 5,485 Crossdresser Shemale and Girl oral sex condom sex
50%
A Married Marilyn
"Class is dismissed. Don't forget the project due…" "Huh, what?" Marilyn woke up disoriented from her nap. When she finally came to, she vaguely remembered some project for Intro to Computer Science, gathered her legs from the chairs in front of her, dusted off her b... Read full Story
shemale lover 2012-03-18 7,184 Group Sex Masturbation sucking Sex Toys
100%
A Strong Man at Work
In life, some people seem to get pleasure out of pissing others off. I think you know what I mean. We've all been there. The first time I laid eyes upon Joan, I thought she was a low-class, boring and obnoxious person. Where I come from, people like that are pretty common. Who am I? Stefan. A tall a... Read full Story
shemale lover 2012-07-05 3,491 anal Creampie shemale
100%
Whatever Your Heart Desires Part 5
There was no way around it; I had fucked up, big time. First things first; I did what every rape victim is supposed to do. Detective Dottie Henson of the police department's Sex Crimes Unit took my report. She escorted me to the hospital to process a rape kit (neither of us expected anything usable ... Read full Story
shemale lover 2012-12-09 2,968 Masturbation shemale fingering
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 3,745 Crossdresser Amateur Fetish Blowjob Ladyboy domination Guy Fucks Shemale Mature 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 3,240 Shemale Fucks Guy Blowjob Big Cock Ladyboy Guy Fucks Shemale shemale fucks shemale Fantasy Tale
80%
Jenna & Stephen Part 2
A lot has happened between Jenna and I since that fateful afternoon when we shared our wildest past experiences, and then lived-out my kinky secret the very next day. While there have been very different circumstances since then, our sexual relationship has still mostly revolved around my affinit... Read full Story
shemale lover 2011-09-01 4,793 Creampie pussy jerking
76%
Nylon teasers
They came into the video store where I worked as a clerk. Almost every day. Teasers. Both of them. What made it both great and terrible for me was that it fed my deepest fetish -- stockings -- as it denied me any fulfillment other than frequent and frantic "self-gratification."... Read full Story
shemale lover 2012-01-30 9,930 Stockings Big Tits fucking foot fetish
92%
A Surprise Relationship
This is a fictional story, although it is based on people I did know. "Tony" and his twin sister "Kim" are based on a set of twins I knew, who were almost identical. I did have a relationship with "Kim" for almost two years, however, the relationship with "Tony&quo... Read full Story
shemale lover 2013-01-29 5,320 anal sex Cumshot Masturbation Blowjob Guy Fucks Shemale
92%
MY Party Favor Fantasy
My Party Favor Fantasy A fictional story built around an old fantasy of mine I ran a notice on one of those sex sites that said” Help me fulfill my fantasy and I bet we take care of some of yours also. Hi there, I am Penny and I am a total bottom trans w... Read full Story
pennypenny 2019-01-08 7,280 Stockings Crossdresser Group Sex Cumshot Masturbation Bareback Creampie Fetish threesome Blowjob Big Cock gangbang Lingerie redhead domination Guy Fucks Shemale Sex Toys Ass to Mouth cum in mouth double anal
50%
I and the old man's story 后面中文
I am from Chongqing, a boy who loves his father. When I was young, my neighbor aunt always said I looked like my sister, like a beautiful girl. At that time, my family was relatively poor. My Sister, my parents, and my family of four lived in public rental housing of less than 30 square meters. Star... Read full Story
Oldslut Sissy 2024-04-15 8,966 Crossdresser Amateur Masturbation Asian Ladyboy Guy Fucks Shemale Mature small cock Homemade sissy chinese teen (18+)
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 12,655 Small Tits Crossdresser Cumshot Masturbation Fetish Blowjob Lingerie Shemale and Girl cum in mouth
100%
Camming Down the Rabbit Hole Ch. 12
We woke up many hours later, still intertwined, my morning wood throbbing as Ellie slid inside my panties and wrapped her hand around it. This was a much better way to wake up than usual, and we proceeded to have a really relaxed slow fuck. She reached a much more low key orgasm but I knew I wouldn’... Read full Story
Dani_does_Dallas 2022-05-09 5,303 Crossdresser solo Amateur Cumshot Outdoor Masturbation Blowjob Shemale and Girl Sex Toys self sucking pov cum in mouth webcams
0%
Jo, Shemale Goddess! Part 2
Jo chuckled as the man in the sharp business suit looked hastily away when she looked up and caught him staring at her legs, again. Her 'Rupaul' legs as men with a history of watching men dressed as women called them, or her 'Naomi' legs as the newer ones to the scene seemed to think. Both divas had... Read full Story
shemale lover 2011-09-05 3,834 anal sex asshole tgirl
50%
Black Mafia - 1975
Bucky Collins downed the last of his whiskey and collected his chips to cash in. His cousin, Don Lee, who served as his driver and bodyguard escorted the Black Mafia attorney-slash-lieutenant to front door. His leisure trip to the Big Apple had been fruitful. Tonight, his winnings totaled $2,300.00.... Read full Story
shemale lover 2012-07-01 3,436 anal sex Creampie shemale oral sex
100%
The Only One
After talking to her online for several hours she invited me over to her house. I got dressed, jump in the car and drove over. I must have been overly excited because my cock was raging hard the entire drive over there. The house was gorgeous, and huge. I thought to myself that this house had to ha... Read full Story
okctshunter 2012-08-18 5,975 Bareback threesome Big Cock
100%
Different 3some in Acapulco
My job in a large travel agency takes me every march to Acapulco for the Tianguis Turistico, (Mexico tourist fair) that takes place in this nice resort. I very much enjoy those trips, and especially the pole dancing bars, were I would hang out at least 2 or 3 times during my stay. Those places ar... Read full Story
shemale lover 2012-08-23 3,455 first time threesome Blowjob fingering
100%
Transsexual Sisters Chapter 6
Part 6: A Party to Remember MICHELLE AND NICOLE MAKE A CAREER CHOICE After their tormentors were jailed, Michelle and Nicole felt relieved and happy for the first time in weeks. Whether from curiosity, respect or sympathy for their ordeal they became very popular around the USC campus. They we... Read full Story
shemale lover 2012-09-08 4,151 Cumshot sucking threesome Shemale and Girl deep throat
94%
Different 3some in Acapulco
My job in a large travel agency takes me every march to Acapulco for the Tianguis Turistico, (Mexico tourist fair) that takes place in this nice resort. I very much enjoy those trips, and especially the pole dancing bars, were I would hang out at least 2 or 3 times during my stay. Those places ar... Read full Story
shemale lover 2013-07-22 6,313 anal sex Latina threesome oral sex handjob
91%
First Encounter
I always has a fascination for transsexuals. I remember my freshman year of college, I don't remember how I stumbled upon it, but I was the most aroused I have ever been as I watched the beautiful Mia Isabella stroke her hard cock. Something about a feminine being, with large breast, voluptuo... Read full Story
Drewbee 2014-11-07 8,840 first time Big Tits Cumshot Masturbation shemale
85%
THE WEATHERGIRL BY B-MAN
PART 1: A COURTESY CLIENT BLOWJOB Three weeks into my gig at Coxon & Dicster had been a blast. At first, a few of the girls had some reservations about me working there because I wasn't transgendered myself but I guess I won them over with my naturally cheerful personality. At least,... Read full Story
bennyx709 2015-07-29 7,521 Crossdresser hardcore ass fucking cd
89%
Fem Firm 2 -The Weathergirl
PART 1: A COURTESY CLIENT BLOWJOB Three weeks into my gig at Coxon & Dicster had been a blast. At first, a few of the girls had some reservations about me working there because I wasn't transgendered myself but I guess I won them over with my naturally cheerful personality. At least,... Read full Story
bennyx709 2016-11-14 18,013 big dick anal sex suck Blowjob cock sucking workplace
100%
TO BE OR NOT TO BE – PART 6
TO BE OR NOT TO BE – PART 6 by Spanky de Bautumn Part 5. Sunny and Antonio got frisky at the bar, Sunny moved in with Mel and Shari, and opening night was a success The only other dress that I brought was one that I hoped I would get a chance to wear but didn't think I would. It was a black ... Read full Story
SpankydeBautumn 2021-02-26 2,447 Crossdresser Cumshot Masturbation Bareback Creampie Blowjob Big Cock Lingerie 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 6,773 Bareback Creampie Big Cock shemale + shemale
50%
Secrets débloqués
Je surfais sur mon PC quand ma copine s'est faufilée sur moi. Normalement, j'étais plus consciente, mais j'étais absorbée par mon regard sur les femmes; puis les femmes en lingerie; puis des hommes en lingerie, puis des hommes en lingerie se faisant fourrer le cul. J'avais assez raide et je la fr... Read full Story
Femboy 2021 2023-01-20 605 Stockings Crossdresser Fetish Big Cock Lingerie Shemale and Girl domination Guy Fucks Shemale
100%
A man & Two Hung Shemales meet in Art Gallery o
I spent a week of absolute extreme erotic ecstasy with Stan. I used his throat and ass multiple times a day. He also fucked and fisted my ass as well. It is a week of total decadence debauchery and depravity. In the late afternoon, Stan and I decide to visit a local art exhibit so we can get out ... Read full Story
darrell 2024-02-02 5,270 anal Cumshot Big Cock Frottage deepthroat shemale + shemale swallow cum