My younger sister’s bi boyfriend

My sister’s boyfriend was secretly bisexual and ended up fucking us both ….

So I am 18 yrs old right now and my sis is 13 yrs old and her bf 16 yrs old. I was not a bit skinny and tall and her bf was a bit just a bit shorter than me yet stronger than me and he knew it and that’s how he took the advantage.

So one day, I was alone at home and mom, dad wasn’t home and my sister’s bf came to visit my sister and I could hear quite a bit of moaning from her room which made me kind of horny, and after a while my sis comes in and says she’s going out with her friends and left me alone ..well that’s what I thought but turns out her bf hid himself in the washroom, so that she thinks he’s gone and he comes to my room and I get shocked because I thought he was gone and he starts asking if I got boner when he banged my sister hard and he closed the door’s hook from behind and started saying like do you want to get that hard pounding from me too, and get your asshole filled with my milk, then I resisted him and since he knew I was weaker than him he pushed me to bed and climbed on me and kissed me and he takes his cock out which turns out to be longer and larger than mine and thrust it into my mouth and deepthroated me, he kept fucking my mouth until he released his cum and it all went in, and at this point I couldn’t resist anymore and then we both undress ourselves and he put oil on my asshole and started thrusting his cock into my asshole, it wasn’t hard for me to take his cock in, since I used to finger or use toys and bottles sometimes for fun. But still my ass was tight and yet he kept thrusting grabbing both my hands from the back and giving me no more choice but to moan, I knew he was showing me how stronger he was than me, then we switch positions into cowgirl, reverse cowgirl, doggy , spooning etc… and kept going…. he actually came inside my multiple times but yet he kept going like a bull, and just wasn’t stopping at all, we kept fucking even when my sister arrived and she thought I must have slept so she didn’t disturbed us and he got hornier thinking of the fact that he’s cheating and started fucking me even harder and harder and I came multiple times too coz he hit my gspot so hard sometimes that just can’t hold it in. I was feeling numb now and no more power to hold myself and yet he goes saying this is the last load for today and cumed all over my body and left.
From that day he secretly fucked me everytime he got chance like once there wasn’t space to sit on the sofa so he let me sit on him and me ending up instead humping on his cock while watching the movie.

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