Stepfather fucked while mom rests

Since my stepfather called but totally hectic with me and told me to come over, because my mother has come from the night shift and rests soundly. At first I did not know what he wanted me to say, but then I quickly realized. His remarks during the week so it was not just mischievous nonsense, but he wanted to fuck me, the daughter of his girlfriend. After thinking a bit I went back to knowing if he's such a villain, and really ....