Barge in

I wasn't about to let her get the one up on me. I hrabbed the door handle and pushed open her door. I strode into her room totally naked.

"Sounds like you enjoyed my show sis…oh" I said

I froze.

My sister was on her back on the bed, naked. Her hands were gripping the bedsheets and her face was contorted in pleasure. However, I realised that she wasn't touching herself, and she wasn't alone. There was a boy lying on top of her. I took in the sight of his naked body. I looked him up and down before my eyes rested on the sight of his tight ass rising and falling. I watched him as he pounded my sister, making her body jerk each time he thrust into her.

I didn't recognise the boy at first but soon I recognised him as the boy next door, Sam. He went to the same school as us and was in the year below my sister. His room had a great view of my sisters room and mine too. He spied on me all the time as I was getting dressed or masturbating. Once I had caught a glimpse of him peeking at me while I was having sex with my boyfriend. I could only imagine that he had gotten equally good view of my sister. And now she was letting him fuck her.

"ASHLEY!" My sister screeched "GET OUT!"