I masturbate all the time, but my parents remarried and I got a step-sister. She's cute, but she's super punctual, so I can't look her in the eye... She even complains that "You're sloppy because you masturbate too much!" and orders me not to masturbate! I can't stand this! When I lamented, my step-sister said, "I'll help you graduate from masturbating!" and started stroking my dick to control my ejaculation...!?