JUL-585 Momoko Isshiki keeps being made to cum by her son's friend's uncontrollable sexual intercourse...

Momoko, a mother, feels a little lonely lately because her son Tetsuya is in a rebellious phase. - However, she is comforted by the friendliness of her son's friend Shinji, who often visits her. - One day, while helping Shinji with his daily training routine, Momoko becomes lustful for Shinji's muscular body. - Momoko started out with him lightly, but since then, Shinji, unable to forget the pleasure he felt once, has sought her out like a monkey over and over again. - And Momoko's body screams at Shinji's extremely tough intercourse...