I catch my little stepsister talking to her boyfriend and fuck her hard to keep the secret from my stepdad.

My shy stepsister was talking to her boyfriend on the phone, I could hear her behind the door when she told her that she was going to run away to meet him and that I didn't even know my stepfather, when I surprised her she told me that she would do whatever it took to keep her secret. I decide to fuck her hard and get inside her pussy as I try to say nothing.