A completely new scenario! The 8th volume of the popular Super-Sexual Boy series! Super-soft-boobed Mayu Suzuki has come as a tutor! In front of the super-sexy boy with a grown-up dick that's hard to believe he's younger than her, she forgets about her studies and indulges in sex! In order to avoid being found out by Masao's mother, the frustrated older sister indulges in creampie sex, but even after 15 ejaculations a day, his cock still has power that doesn't fade, and her older sister is on the verge of breaking out!