Fiancées' Sister

My fiancés younger sister had been staying with us since Feb/March after moving out of her mums, and this August she moved to University but moved down a couple of months early as she was renting a place rather than student accommodation. So for one of her last evenings we, me , fiancée and sister went out for some celebratory drinks, came home and stayed up chatting for a while. My fiancée went to bed before me, and when she left her sister decided to move around on the sofa to see the TV a bit better (we have a curved sofa, sometimes the light hits the screen in the wrong place if you're at a certain angle). As she came round she lost her balance and landed in my lap, which did kind of hurt lol, we started kissing my hands all over her body and b****** (they're 3 cup sizes bigger than the 34a on my gf) and squeezing her gorgeous ass. She unzipped my shorts and whipped my c*** out, instantly her panties were thrown across the room after being pulled from under her skirt. I pushed her back and started to f***, and f*** her really hard knowing my fiancée could walk in on is at anytime just made me thrust harder and throb even more inside her until I felt my c** fly up my c*** and splash inside her sisters 18 year old p****. Last Sunday I got a text telling me she was 90% sure she was pregnant, and hadn't slept with anyone else... This is going to be an awkward conversation when it gets brought up next time we're together in a room but I'd do it all over again

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