During family dinner, my stepsister went to the bathroom. I really wanted to fuck her, but I didn’t know how. I told my parents that I would go to my room, but I went to my stepsister in the bathroom. I locked the door behind me and started pestering her, she didn’t mind. We were very afraid that our parents would not hear us, but we really wanted to have sex. I took off her panties, loaded her doggy style, laid her on the washing machine and inserted my dick into her tight pussy. She wanted to moan, but I shut her mouth so that her parents wouldn’t hear us. I lifted her T-shirt and massaged her small tits while I fucked her from behind. We came together. I filled her ass with a very large portion of sperm, which I smeared with my dick on her body. It was very risky, but we had a really great fuck.