My wife's sister had an affair with me.

My wife's best friend cheated on me with her. My
wife was away on a business trip, and I was home alone. I usually watch porn secretly when my wife is asleep, but today I was watching it in the living room with my legs crossed. As I watched, my penis started to rise. Hmm, that's exciting.
I was just starting to soothe my penis with both hands when suddenly the doorbell rang. My wife's best friend, Xiuxiu, was outside, calling, "Xinyi... Xinyi..." Oh my god, I hurriedly turned off the TV, cleared my throat, and said, "Oh, she's here... Xinyi's away on a business trip..." as I opened the door.
Xiuxiu lives in a studio apartment downstairs and often comes over to visit my wife. Over the years, the two have become like sisters. I tried to remain calm and asked her what was wrong. She said she was returning Xiuxiu's trench coat, saying that Xiuxiu had lent it to her when she went abroad last time... I don't know if Xiuxiu wasn't home or what, but she seemed a little uncomfortable. I pretended to be generous and invited her to sit down, but she kept her head down looking down, which was very different from usual... I followed her gaze down... Oh my god, the zipper wasn't zipped up! "The second one hasn't been brought in yet..." It was so embarrassing. I stammered, unable to say anything. She put her clothes on the sofa, lowered her head, and said she was going home and would come back another day... I blankly replied
My blood was surging, and the lust from watching porn returned. Her breasts were pressed against my chest... I'd been fantasizing about these breasts through her clothes for over two years, and now they were pressed against my skin. She was breathing heavily, her breasts bobbing up and down, as if urging me to grab them. My hands involuntarily reached up to them. Her seamless bra clung tightly to her breasts; even a large hand couldn't fully grasp them, unlike my wife, who had to use a magic bra to barely create cleavage. I pulled up Xiuxiu's t-shirt, ripped off her bra, opened my mouth, and began sucking on her pink nipples.
"Oh!" Xiuxiu gasped softly, her whole body trembling, and she collapsed onto the low cabinet by the door. I knelt down beside her, continuing to suckle her breasts, one hand slipping under her skirt and sliding down her thigh. Her panties were wet. I pulled them down and boldly slipped my fingers into her genitals. Her legs were tightly clamped together, leaving me in a dilemma. Oh well, I was already in this situation, so I didn't care anymore. I pried her legs apart with both hands, and my penis eagerly slid inside. I pushed and squeezed... With my sudden insertion, Xiuxiu gripped my shoulders tightly, her legs naturally arching to wrap around my waist, and she started moaning. I'd been dating my wife for six months and married for two, and I'd never heard her moan during sex. I never expected my twenty-three-year-old neighbor to moan so passionately... After only a few hundred thrusts, I was already climaxing. I used all my strength, but couldn't last more than thirty minutes before surrendering.
Xiuxiu, her lust heightened, looked at me in surprise. "So fast? You and Xinyi can last over an hour, can't you?"
"How did you know?" I asked, puzzled.
"My room is right below yours..." Xiuxiu said shyly.
So, the downstairs neighbors could hear the bed shaking every time my wife and I had sex at midnight? Then Xiuxiu knew exactly how often we did it and how long each time lasted…
“I’m often woken up by you two… your bed seems a bit unstable…” Xiuxiu said, head down.
“Then, what do you do when you’re woken up? Doesn’t it annoy you?” I asked cautiously.
“Sometimes I want to… so I masturbate…”
Xiuxiu’s voice trailed off, but I became more and more interested, pressing her to tell me how she masturbated.
"Just massage her clitoris with your fingers..."
I knew she hadn't had an orgasm last time, so I encouraged her to try. She initially refused, but I pulled her hand to her vulva and kneaded her nipples with my fingers. Her fingers actually stroked her clitoris back and forth, her body trembling slightly against me...
Oh my god, her shy appearance awakened my manhood. I picked her up, placed her on the sofa, pushed her hands away, and used my tongue to tease her labia. I watched as secretions slowly flowed from her vagina. As she came out, her body tensed more and more, and my tongue flicked faster and faster. When she cried out, I knew she had climaxed. I pulled her up and straddled her, lifting her buttocks and thrusting back and forth against me. She couldn't hold on any longer and started twisting wildly without rhythm, forcing me to push her back onto the sofa and press her down with my penis. I pulled her legs onto my shoulders and grabbed her buttocks with both hands to keep her from moving restlessly. Back and forth, back and forth, for more than an hour, I finally ejaculated again.

Before I could even come to my senses, Xiuxiu had already stood up, pulled off her clothes and skirt, picked up her underwear and panties by the door, and left without saying a word. From that time on, every time my wife went on a business trip, she would find an excuse to come upstairs and have sex with me.

One day, I was going to work alone when I saw Xiuxiu walking to the alley entrance to catch the bus. I asked her for a ride, but as soon as she got in the car, she reached over and touched my genitals… I was so nervous I didn't know what to do. Afraid of being seen by the neighbors, I sped up and drove to the nearest motel. She continued sucking my penis the whole way, oblivious to everyone else. Once we got to the motel, before even getting out of the car and into the room, she unbuttoned her shirt, pulled down her bra, and started touching her own breasts… Then she lifted her skirt and put her fingers inside her vagina to masturbate. As I watched, my penis grew increasingly aroused. I flipped over the gearshift and pressed down on her…
While we were having sex, I pulled her out of the car. She seemed unwilling to stop, so I made her lie on the hood and penetrated her from behind, kneading her breasts as I thrust in and out. She screamed loudly until I was almost at my limit. I pulled out, dragged her into the room, threw her onto the spring bed, and continued the next round…

We tried all sorts of affairs and all sorts of sex positions until she got married and moved to Canada, ending this five-year affair.

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My wife's sister had an affair with me.

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