After my mother remarried, I raped my sassy younger sister, who was annoying but had the cutest face, and she became my brother.

My mom remarried and I got a damn sassy younger sister. In front of my parents, I act like a smiling and nice kid, but the way they look at me is clearly condescending. It's annoying, but just the face! Her face is the cutest thing ever. In the morning, after everyone went out, I was secretly masturbating in my sister's panties, but my sister came back to get something she forgot and saw me...