My Friend's Mother, Kazama Yumi, MDYD-763

Occasionally, her son's best friend, Shinya, would stay overnight, but he secretly harbored a crush on his mother, Yumi. One day, Takayuki witnessed Yumi masturbating and assaulted her. The following night, even Michiro joined in, savoring her voluptuous body. While her son was away at a camping trip, the young men took turns forcing themselves on her in a threesome!