Your stepson has good taste in girls, but this one is a little different. She apparently prefers older men, and has had a crush on you for a while. When she showed up in her bathing suit to hang out with your stepson, she seemed to know that he wasn't going to be there. It didn't take long for this little slut to start trying to seduce you. She loves showing off her petite body for an old man like you. Go ahead and take your cock out for her, she promises not to tell.