Ever since he was young, Shinichiro has had feelings for his mother, Marinan. However, his rationality prevents him from taking that final step. Meanwhile, his father returns from his assignment abroad after a long time and unleashes his pent-up lust on Marinan's anus. Marinan, in her prime, also indulges in self-pleasure when alone. Shinichiro has no chance to intervene, so he seeks advice from his best friend… Finally, Marinan of Matsumoto takes on the forbidden anal challenge! The sight of her pure rosebud being penetrated by a thick cock and feeling lewdly is a must-see!
