Ryo, who is working out to release her pent-up sexual desire while her husband is away on a long business trip, comes to visit her son's friend Kosuke. She is Kokoro by the young, strong cock she happens to see... She can't resist and makes advances on him. At first, Ryo is Ryo to be made to cum many times, but Kosuke has an insatiable cock that doesn't stop after one or two times. The intense thrusts continue without end, and Ryo's body begins to scream in pain as they climax every day...