I decided that my super shy stepsister would never tell her parents, so I started to tease her by secretly playing with her nipples every day! At first, my stepsister resisted and was embarrassed, but after the teasing every day, she became super sensitive and prone to premature ejaculation, and she transformed into a perverted girl who drools and cums just by lightly touching her nipples! Once I've developed her to this extent, I can easily insert it! After teasing her with teasing all day and making her cum hard with a real slut, my stepsister is now my sex slave! It's much easier and more satisfying to develop my close stepsister into an erotic way than to make an effort to get a girlfriend!