I catch my Step Sister watching Porn and she wants me to fuck her hard

I go into my stepsister's room to tell her some things, and I find her touching her pussy while watching porn on her phone, I ask her what she's doing and she says very hot, you can't see it, I'm trying to cum, I decide to offer my help with that and she accepts. I start fucking hard in the missionary position and I end up giving it hard doggy style, until he can't take it anymore and I cum on his ass. This stepsister of mine, she's going to finish me off, she always tries to fuck me and I end up falling in love with her. I hope it happens again because she fucks great.