Boy/Girl custom with a stepMom/stepson theme. With the idea being that you don't want your stepson to lose his virginity to his girlfriend and that it belongs to you. So you make him call his girlfriend and break up with her while you suck his dick then you fuck him. During the sex you're calling him a good boy and telling him mommy's pussy will always be best. He's fucking you so good that you tell him you're never letting him go and you make him cum inside you.