My stepsister is the ejaculation management manager?!? I, a masturbation addict, am forbidden from masturbating to accumulate sperm for an ejaculation-inducing lifestyle. (Hinata Hikage ROYD-164)

Because my parents remarried, I had a stepsister. She's cute, but incredibly awful and unbearable... Then she scolded me for masturbating too much and issued a ban on it. I just couldn't take it anymore. At that moment, my stepsister said, "Let me help you graduate from masturbation," and started controlling my ejaculation, even starting to stroke my penis...