A private lesson with a voluptuous coach. His breasts, ass, and hair stick out during stretching, making him hard as hell! "I thought you were practicing seriously, but why are you getting so hard...?" He touches his crotch and says, "At this rate, the water resistance is so strong that it's not good for practice..." Seeing his erect cock, he gets horny! He can't help but move his swimsuit aside and shake his big ass at the devil's piston, and his pistons accelerate, making him tremble in ecstasy!