Energetic, curvy porn star Miyu Morita enters the Standing Doggy-Style Challenge. The rule is simple: only standing rear-entry sex is allowed, and she wins if she makes the male performer cum within five minutes of penetration. Miyu gets wildly excited from the first touch, then builds the heat with deep kissing, oral sex, cunnilingus, and fingering before the contest begins. Can she make him finish, or can he hold out? The winner remains a surprise, along with the sight of Miyu's legs giving way as she sinks to her knees.