Witnessing his girlfriend perform oral sex on her brother

My girlfriend, Miaoxuan, whom I started dating in my junior year of college, is 21 years old, 158cm tall, and weighs 45kg. She has a slightly plump figure, with most of her weight concentrated in her belly and upper thighs, but she knows how to use clothing to conceal it. Her breasts aren't large, only a B cup, like two small steamed buns.
However, she has a very beautiful face, a perfect oval face with big, watery eyes. Her face shape is that of a classic beauty, and her skin is fair and smooth, showing that she takes good care of herself, making her look very presentable when going out.
Before we started dating, I thought she was very lively and easy to talk to, but after we started dating, she became very difficult to get along with. She is very concerned about her image, lazy and unambitious in life, and somewhat like a princess. Sexual relations often require a lot of coaxing before she will perform oral sex.
When she does talk, she only likes to talk about herself, and her favorite topic is her brother. She can't stop talking about her brother, but she gets angry if I tease her about being a brother-obsessed person.
Every time I go back to my family home in Taipei for vacation, she becomes very difficult to contact, only replying to messages once or twice a day, because her family doesn't like her constantly using her phone. One time, we arranged to video chat that evening, but she said her brother was in her room and she couldn't stop, so she insisted on canceling. We argued about it, and later she asked her brother to come back to his room, but she also had a conflict with him, and then she blamed me. The whole thing ended unpleasantly for both of us.
That day, we finished quickly, and she turned off the lights and went to bed. I played my own games. But an hour later, I kept hearing static in my headphones. I checked and found that my girlfriend hadn't turned off her computer; the video call was still on. The screen was dark, but there was a constant rustling sound.
From the screen, I could see my girlfriend's bed, the foot of the bed facing the door, the side facing the camera. My girlfriend was wrapped in a blanket and seemed to be lying down, but there was a dark shadow slowly moving towards the bed near the door. Without the light on, I couldn't see clearly, only vaguely recognizing a person.
"Are you asleep?" The voice was clearly male. The dark figure strode up to the edge of his girlfriend's bed, bent over, and knelt on the bed with his legs over the blanket. His movements were indistinct, but it seemed he was shaking his sleeping girlfriend awake.
"Sis, are you asleep?" It sounded like his girlfriend's brother. I remembered him being a year or two older than me, but he was very immature and a homebody, not good at socializing, and had never had a girlfriend.
"What is it?" His girlfriend's impatient voice came through, already woken up.
"I just went on a date with my senior, and I'm really hard now. You need to help me fix it." His girlfriend's brother said in a soft, breathy voice, but the microphone picked up so much that even the slightest rustling of the fabric could be heard.
"I don't want to." His girlfriend's voice was louder: "Do it yourself."
"Hurry up, I'll take you to the station tomorrow." The voices fell silent for a moment, leaving only his girlfriend's impatient exhales and his brother's heavy breathing.
After a while, my girlfriend turned on the bedside lamp. I saw her brother straddling her body, his lower body thrusting towards the headboard, his loose pants creating a tent.
This was the first time I'd seen my girlfriend's brother; I'd only seen him on Facebook before. He seemed to be about my height, around 180cm, with messy hair and a thin, somewhat nerdy appearance. I didn't know what he was going to do, and felt a strange tension in my heart. I immediately pressed the mute button on my microphone to avoid making a sound.
The yellow light illuminated my girlfriend's perfect face; her crescent-shaped eyes were slightly open, her brows furrowed, and she impatiently pulled a hand from under the covers and placed it on her brother's crotch.
"I'll only use my hand," my girlfriend said, something she often said to me. I was immediately startled, my heart skipped a beat, my mind went blank, and I stared blankly at the man and woman on the screen.
The brother nodded, and the sister reached into his pants and pulled out his erect penis. Her four long, slender fingers pressed against the shaft, squeezing it tightly, and she casually began to stroke it up and down. The brother, looking like he hadn't masturbated in a long time, wore a satisfied expression, his erection a result of his sister's sexual services.
I was momentarily stunned and didn't know what to do. I had always been unhappy with my girlfriend's overly intimate relationship with her brother, but I never imagined they were actually having this incestuous affair. And judging from what her brother said, this certainly wasn't the first time, but my girlfriend's casual attitude gave me a strange sense of superiority.
After a few minutes of rubbing, I sensed something was wrong. My girlfriend's hands were tightly gripping and moving up and down. Usually, at this point, I should loosen my grip to avoid premature ejaculation, but she kept vigorously stroking the shaft of her brother's penis, while her other hand was open, rubbing the tip of the shaft with her palm.
"Sis, use your mouth,"
I said, thinking my girlfriend definitely wouldn't cooperate; she always refused when I asked her to use her mouth. As expected, the girlfriend put on an unwilling face and said in a tone that was enough to make one's blood boil, "I...don't...want."
"Okay, okay, I'll wash the dishes for you tomorrow, just suck like usual." The brother said, holding his sister's hand and continuing to stroke it up and down.
The girlfriend thought for a moment and said, "You have to wash the dishes for me three times, and you have to do it yourself."
The girlfriend's brother immediately replied, "Okay, okay, hurry up, open your mouth." He was completely in a state of lust.
The girlfriend's face showed a sly smile, with an expression of "I've hit the jackpot." She closed her eyes, opened her small mouth, pointed to the back of her throat with her index finger, and "ah" signaled for her brother to insert it, which was incredibly lewd.
Because the girlfriend was lying flat, her brother put his hands on the wall, leaned forward, and without any hesitation (I thought to myself that I would not be polite either), thrust his penis into his sister's mouth. At this point, the camera was not so clear, and you could only see the girlfriend's small face pressed against the brother's crotch, while the brother pressed against her and thrust forward, using his sister's mouth as a masturbation device.
Seeing this, I unconsciously started touching my already erect penis. I had never seen my girlfriend do such a lewd and provocative thing before. I felt indignant, but also excited, like watching porn.
A while later, my girlfriend's brother lifted her up from under the covers and sat her on the bed against the wall. My girlfriend was wearing a pink cotton winter nightgown, which completely obscured her figure and made her look anything but sexy.
He held the back of my girlfriend's head with both hands and pounded his penis into her mouth like he was pounding mochi. My girlfriend held her brother's thighs to keep her at a certain angle. The sound of water splashing as his penis went in and out was "plop plop," and I couldn't tell if it was saliva flowing from her mouth, but of course, it wasn't visible on the screen.
"Oh, that feels so good, suck harder."
"Hmm?" My girlfriend said no with his penis in her mouth, then slowly spat it out, making a "pop" sound from the vacuum in her mouth. She said, "I told you you have to do it yourself," and then swallowed her brother's penis again, letting him continue to enjoy himself.
"Oh...okay, then at least you have to help me get into it, otherwise it'll take forever."
"You...what do you want?" My girlfriend hesitated for a moment. I knew that when she really had sex, she was half-sadist and half-masochist. She liked being ordered around and also liked being given whatever she wanted. When she got wanton, she would also tease me.
"Show me your pussy." My brother said shamelessly, almost drooling. My
girlfriend looked up and pretended to think for a moment. While pinching her pants waistband with her right hand, she pretended to pull them down to show her fair thighs. She said provocatively, "You really want to see?" Her brother nodded vigorously, so excited that he could hardly speak. My
girlfriend lay down lazily, pointed at her brother and told him to kneel down. Then she put her legs on his shoulders and pulled her pants and underwear up to her knees as her brother asked. She then put her other hand between her legs to prevent him from seeing. From my girlfriend's brother's perspective, he would probably see a wad of cotton pants. From the camera angle, I could only see the outer thighs and her white buttocks.
At this moment, my girlfriend's brother, overcome with lust, pulled down her pants above her knees and threw them on the bed. He excitedly masturbated with his other hand, clearly having already enjoyed the sight. I, however, couldn't see anything and could only stare intently at my girlfriend's buttocks, like trying to scratch an itch with a cotton swab—it didn't really itch.
My girlfriend was slightly startled and quickly squeezed her legs together, but then obediently opened them again, allowing her brother to freely admire her private parts.
"Okay, I've shown you, hurry up." My girlfriend said, rubbing her legs together. "Otherwise, if Dad sees this, he'll beat you to death." She pulled a few sheets of toilet paper from the bedside table and handed them to my brother, saying in a condescending tone, "Okay, cum!" Her voice was high-pitched, as if she had the right to decide when he should finish.
My girlfriend often did this indecent thing, but I always managed to convince her to let me cum on her. At this moment, I was particularly nervous, like watching the ending of a detective movie, anxious and excited at the same time.
"Ugh, no, no more toilet paper!"
"Where do you want to cum? Can I cum in the toilet?" My girlfriend looked mocking, grabbing my brother's penis and pressing it down, making it bounce back up.
"Can I cum on your breasts?"
"No, I don't want to take my clothes off." My girlfriend continued, "But you can cum on my stomach." After saying that, she lifted her cotton pajamas a little, revealing her slightly protruding belly.
My girlfriend's brother moved closer, grabbing his sister's open legs with one hand while continuing to vigorously masturbate with the other. This sight seemed to give my girlfriend a sense of accomplishment; a satisfied smile graced her face. She spread her legs even wider, making it easier for her brother to aim at her genitals.
"Ah, ha, coming!" Her brother's panting was clearly audible through the microphone, which I, on the other side of the screen, found quite disgusting.
"Brother!" my girlfriend called out sweetly, pointing to her lower abdomen with her hand and saying in a cute voice, "Shoot here, little sister!" She held onto her clothes to prevent them from slipping down.
My girlfriend's brother's penis jerked twice and stood up. Without saying anything, he pulled up his pants, got out of bed, walked out the door, and disappeared from the camera's view. The light from my girlfriend's bedside lamp made it impossible to see when he finished. My
girlfriend, naked from the waist down, got out of bed, closed the door, and walked to the computer desk. At that moment, I was filled with horror. I didn't know if she knew the camera was still on. I mentally considered several possible scenarios: should I be angry or sad, should I yell at her or listen to her explanation?
My girlfriend walked over. When she was standing, the laptop's slightly downward-facing camera only captured her bare triangle area and plump thighs. All I could see was thick, white semen clinging to her slightly protruding belly. The white fluid slowly dripped down her messy black pubic hair. Her lower abdomen was a mess, with strands of semen running between her legs, and even her navel was glistening.
"Damn, so much semen, it must have felt really good. That bastard doesn't even say thank you." My girlfriend's voice was amplified because it was close to the microphone, stimulating my brain. Visually, I saw my girlfriend with one leg on the table, wiping the sticky, stubborn semen off her body with toilet paper.
Watching my girlfriend deal with another man's semen finally made me ejaculate as well. I couldn't help but think of how my girlfriend had been filled with semen by my brother, while I was alone in my room, ejaculating on toilet paper.
To avoid my girlfriend finding out, I hung up the video call (or maybe I was in saint mode). My girlfriend didn't act strangely when she returned to school, and I couldn't find a reason to bring it up, so I didn't bring it up again.
Looking back now, maybe I was afraid that bringing it up would lead to a breakup, or maybe I didn't want it to happen again. Sure enough, I later witnessed more things that I don't know whether I wanted or didn't want to happen...
--This
is my first time documenting an event, and also my first time writing. The content is basically adapted from true events, so the language is concise and realistic, without any embellishment or explicit sexual language. If you think it's not true, feel free to treat it as a regular essay.
I hope you'll give me some feedback since this is my first time writing. I'll consider writing about the subsequent events as well. Thank you for taking the time to read!
This topic was approved by monykkbox at 18:05 yesterday.

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Witnessing his girlfriend perform oral sex on her brother

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