Blackmailed by my Step-sister

So this is awkward . I was going to get my Step Sister Lily , because dinner was ready and I accidently walked into her pleasuring herself . I told her not to tell her Mom because I don’t think she would be too happy. Being the brat that she is , she blackmailed me into giving her my fat dick or she was going to tell on me . The Nerve of some people!!! Well I fucked her good and left her with a creampie.