[Natsuki Mizuki] Sex Education Practicum: Genital Observation Edition

Ueno, a shy student in a school gym uniform, reacts in surprise as a sudden thrust exposes his genitals, prompting an awkward yet curious exchange with a fellow pupil. Their tentative dialogue reveals conflicting impressions of the experience, from textbook depictions to the harsh reality, while they explore each other's bodies with hesitant touches and whispered promises. The scene builds a tense, intimate atmosphere as they navigate the unfamiliar terrain of genital observation together.