Mahiro, 27, has been frail since childhood and started going to the gym to improve her health. There, she meets Yoshio, a muscular instructor, and they hit it off. They decide to train together at a hotel this time. Mahiro is excited to see Yoshio in casual clothes, unlike his usual training wear. They discuss training methods and have a high-protein meal before heading to the hotel. They start with aerobic exercises, and Mahiro's breathless gasps are erotic. Yoshio is aroused by the sight of her tight pants. He uses his position as an instructor to touch her body, saying that sexual arousal makes the body stronger. Mahiro doesn't resist as they kiss, and Yoshio is thrilled by how wet she is through her pants. He discovers her firm ass, hard nipples, and bare pussy. Despite the sweat, she squirts profusely. Her upward gaze and small mouth eagerly sucking his cock is incredibly sexy. Yoshio's muscular, thick cock ruthlessly grinds against Mahiro's G-spot, making her feel and cum intensely. She's in a daze from the pleasure. High-speed pistoning causes her pussy juices to foam. A sudden angle change leads to an unexpected massive creampie. Her husband would never imagine his wife getting hard fucked and bred at the gym.
