My stepsister gets intimidated

My stepsister has always come from the study before me. She is a good student, but I think, she is more interested in than what hides from me. Today, I decided not to go to the last lesson and sp on her, that she would do alone at home !? I crept to the door so that my stepsister could not see me. And what I see? My nice and diligent stepsister watches adult movies. I could not believe my eyes. But from what she caressed herself, my dick gets hard and strong. She caressed her breasts, and then she pull down her lovely fingers and through her tiny panties started to masturbate. I began to watch her and wait until she is ready. I go to the house and my stepsister was embarrassed, we talk and she asked that I forgot what I saw, but I did to intimidate her. I knew that she was hot and she wants to continue. I said that she would give me a blow job, she says no at first, but then she liked it. And she pounces on me and start to ride on my cock.