Her hips chased me, trying to keep me inside. "F-- faster, Matty. I-- I can-- oh oh god-- please!" My resolve had already been straining, and this put it near the breaking point. I didn't fuck my sister, not in the rough way that I might have wanted to as she urged me on. But my lovemaking became less gentle, more rapid than perhaps it should have been. She winced in pain once, and I tried to slow, but then she grunted, "Fuck me, big bro! Fuck-- AH!" She got her wish.

Sammy was so tight that when her climax started to come, it was like being gripped by a...