[Nagoyama] Aren't Butts Embarrasing?

Yumi Aoyama, a nervous second-year middle schooler, learns her best friend keeps a masochistic uncle as a pet—and when the groveling man begs to serve as a human toilet, she happily rewards his devotion with a long-awaited taste of her unwashed ass. That's only warm-up: her real assignment takes her to a steamy inn where a dozen board of directors misters record her fumbling peace-sign self-introduction before burying their faces between her plump cheeks, teasing that a schoolgirl's hole has no business smelling that strong. Caught between mortification and a hidden masochistic streak of her own, Yumi discovers that embarrassment might be exactly what makes her butt so irresistible.