The ultimate eroticism of a woman's body is when it's in motion. Riko Hoshino, with her exceptional physique, takes on a full-frontal outdoor sports test. Her muscles contract repeatedly, her entire body drenched in sweat. She fully utilizes her physical abilities and takes on the challenge seriously. Measurements were taken during the rotor installation and insertion. She even showed an expression on the verge of fainting between fatigue and pleasure.