I had a plan, I wanted to seduce my father so he will loose his interest in my future step-mother. I know he doesn't love her, he only likes a good fuck she is but that I could give him too if he wanted it. I only had show him that I also wanted it. Every time I had a chance I did a move until he finally understand what I wanted. We are now having sex for about 1 month and his interest for his girlfriend is decreasing, a bit more and she's on the street.