Taking on the challenge of taking a virgin's first time! Wearing requested costumes like schoolgirl and gym uniforms, Momoka Kato takes the lead as a sexy older sister since her partner is a virgin with even less experience than her. Amidst erotic lessons that lead to premature ejaculation and continuous cumming, her maternal instincts awaken at the virgin's innocent reactions, turning the sex into a gentle, enveloping experience.