Trying to work up the courage to talk to a girl at school, you ask your big sister for advice. Star Nine laughs at you. Talking isn't the part you should be worried about.
Your big sister wants you to be prepared for what comes next. She wouldn't want you to humiliate yourself. Before you bother talking to girls, you need to be sure that you can control your cock. So you don't cum in your pants at the first sight of tits.
Luckily big sis is here to teach you. She shows you her tits and pussy, ordering you to stroke your cock continuously without cumming as she poses and teases you. Finally, your sister gives you a countdown to cum after you've proven your control.
Includes edging, JOI, taboo