I don't have a girlfriend. But I have a strong sexual desire, and I spend my days masturbating all the time. Then, one day, my parents remarried and I got a step-sister. She's cute but super punctual! What's more, she complains that "You're sloppy because you masturbate too much!" and even controls my ejaculation! I can't stand this life anymore! But then my step-sister strokes my dick while making nasty remarks... And not only does she give me a handjob, she also inserts it! I'm being managed by her top-notch management skills every day.