My Step-Daughter Will Do ANYTHING To Stop Me From Moving Out

Today is finally the day, I am going to leave my wife. The last decade of our marriage has been a complete let down. Zero sex life, and my wife has completely let herself go. All she wants to do is stay inside, watch tv, and eat junk food. I have stayed faithful and never cheated, well, until today. As I am in my bedroom throwing some clothes quickly into my suitcase to get to a hotel for a few days, my step-daughter comes in and asks what is going on. I eventually give her the whole run down and she starts begging me not to leave. She is willing to try anything, and ends up mentioning that fact that she is the complete picture of my wife when we first started dating. Well, that leads to her offering to suck my dick if I agree to stay. We eventually settle on a blowjob for one more night in the house. She immediately goes to work and plays into the fact that she can give me everything I am missing. She really is the spitting image of my wife from years ago, except a lot dirtier, and with way bigger tits. She gives me an incredible slow sloppy blowjob and then asks why I haven't cum. At this point I have gone so far that I have to fuck her. I don't even have to ask, before she offers up her pussy in any way that I want it. So I have her crawl on top of my cock and she is sopping wet. She rides me like I haven't been ridden in years, and then flips over for me to fuck her deep in doggystyle while I spank her ass. She shows me exactly what kind of slut she has become, and tells me to cum wherever I want (even inside her) because she has an IUD. So I do, I fill my step-daughter's tight pussy up with cum. How did I raise such a whore, and end up with some one as lame as my wife.