El Culo de Mi Cuñada

Everything started on a scorching summer day where temperatures were soaring and the heat was unbearable, especially at night when you had to sleep with windows open or a fan in the rooms. Well, that same morning my sister-in-law had come to our house with my girlfriend to chat and have a good time, I told her that my sister-in-law is my girlfriend's twin, she's short, 1.55 meters tall, blonde hair, straight, small breasts, but with a generous big sponge-like butt, well, we spent the day and it was night when my sister-in-law decided to stay overnight since it was already late, my girlfriend lent her a pajama which had become too hot, while she was deciding between a flannel or cotton one, she kept getting up every now and then to ask my girlfriend which one fit better for sleeping, nobody would see her, but the one who would be seeing her was me, who from time to time every so often would let her pants drop and show off those beautiful cheekbones of hers and subtly show off her lacy black underwear with a medium transparent fabric, showing off that tremendous butt, I would turn my head around to appreciate it better since it's a round and hard butt, suddenly my sister-in-law says what do you think I should wear, this one or the previous one which was a two-piece flannel pajama quite hot, I told her the previous one was fresher and she put on the other. That's all, we went to sleep, she stayed in the guest room which was right in front of the bathroom and had a window that looked out onto the hallway but not onto the street, I woke up at midnight and went to the bathroom, turned on the hallway light and when I passed by her window, I saw her with her butt up in the air without pajamas from the bottom and with a bra with straps on top, I remember those perfect cheeks with a black transparent underwear I was leaving my sister in law's ass visible, her buttocks seemed like white, soft, and large mountains, my penis got hard at 1000 demanding to be let out, I took out my penis and started stroking it smoothly while appreciating my sister in law's tremendous ass, as I stroked my penis she felt the light from the hallway and half woke up, rolled over onto her back, leaving me to see those small but beautiful breasts of hers, her legs were open allowing me to see her semi-depilated pussy, which made me so excited that I realized I had wet dreams before sleeping because there was moisture in her underwear, I didn't stop stroking my penis as it was about to come but then I heard the door to my room and ran quickly to the bathroom, after a couple of minutes with my flaccid penis waiting for my girl not to notice, I went back to the room and she asked me while still asleep where were you? I told her I had to go to the bathroom, I wanted to sleep but couldn't think about my sister in law's tremendous ass, it was around 3am when the alarm of my sister in law's car sounded as it was parked on the street, I didn't pay much attention thinking it would stop soon but it didn't, a minute later I went downstairs to check if everything was okay, not turning on any lights so as not to alert anyone, and what was my surprise when I got down there that my sister in law was already below looking out the window to see if someone was in the car, there was streetlight from the lamp which let me see her but she didn't notice I was there, when I saw her she was bent over with that tremendous ass of hers which made my penis stop momentarily (that night I was sleeping in those boxers with buttons at the front where your penis comes out if you get an erection), so I was admiring that tremendous pussy of hers which was exposed because The thong underwear was loaded to one side and she bent down, letting me see that little pussy very yummy. After a few minutes, she realized I'm here in the room and whispers shhh don't make noise, be quiet as if no one is around but let me peek again She takes my hand and makes me follow her to the store. When she peeks out and bends down to peek again, she puts her ass on my penis which becomes erect and starts to palpitate desperately as if it wants to get into her pussy which was peeking coquettishly from that thong underwear. My penis was wet from so much pre-cum I was shooting, I wasn't paying attention to the auto, I just saw how she put her ass on my balls that beautiful big round hard one looked like a peach, it seemed to turn left then right to see if no one was in the street after that and my balls full of semen felt like I was going to come, she didn't stop holding my left hand which she had without realizing it in one of her breasts. She stayed bent down for three minutes, contorting her ass on my balls, my penis, my hand, and her breasts, for me it were hours not minutes. After that, she says creo no no hay nadie just then a knock is heard at the car trunk, because it was a slut who was making so much noise, she realized this and says maldito slut And I respond but if it was that one and tell her to peek again but open the store door and peek out her head to see if no one is around, she turns around, bends down, and peeks out, and I appreciate that beautiful ass wanting to have it in my penis which was dripping semen as much as possible, her pussy coquettishly coming out of the underwear as if wanting me to put my penis in, at that moment she says look come peek again be quiet as if someone is there When I peek out, I do so above her back, her back resting on my chest, my penis just between her two buttocks which were soft and hard, my balls just in her pussy, I was telling her I don't see anything and I would move forward to rub my penis. I was on her ass for a couple of minutes and my penis came out of the boxer briefs between the buttons. I noticed that and got up to go back so she wouldn't notice when I put my penis in the boxer briefs which were already quite lubricated. She says look, come here, it seems someone is approaching and I went back to how I was before, with my penis just reaching her crotch and having come out of the boxer briefs. I felt like my cock was entering slowly into that humid and warm little thing, which would be all for me since I didn't want any trouble with my sister-in-law. I stopped for a few seconds, my sister-in-law obviously aware that my cock's head was in her crotch, she turned around leaving it to let all of my cock in, puff it was crazy feeling like that little thing was swallowing up all my cock. Then my sister-in-law starts swaying and letting me see that tremendous ass of hers, I didn't move, letting her move that ass, first moving it from side to side as if waiting for more of my cock to enter. After a while, she started backing up giving me tremendous views of her ass and letting my balls hit her stomach, I was getting excited, she noticed I was about to come, took my cock out of her crotch, got down on her knees, licked the whole length of my cock, pressing my penis against my stomach and turned around to give me a no sign while still holding my penis, then turned around with the other hand and went down to her knees, put her head in my cock's head and started introducing it slowly, while she started pushing and said put them in your ass, that really got me going, I let go of my cock and immediately put all of it into her with great force, was putting it in and taking it out a couple of times while she just whispered mmmjjj sii – fuck me until I emptied all my balls into her tremendous ass. She stood up, pulled up her pants, took hold of my cock and licked my balls which were still coming out of my cock, then... Clean my cock well takes me by the hand, accompany her room and I mine. Then I'll tell another anecdote with my sister-in-law.