Based on the erotic game by Msize. 
 
Masaki Fujiwara has a problem. Recently, he's been aware that he's been feeling lust towards his mother. He understands that it's not normal. But he can't suppress his overflowing emotions. Unable to even talk to his close childhood friend about it, he becomes frustrated... and his reason reaches its limits. He keeps staring at his mother's beautiful back. Her voluptuous body arouses his sexual desire. Even her gentle motherly voice draws Masaki's heart... and finally, he touches her. But his mother's reaction is something Masaki never expected. "What a child... lusting after your own mother...!" His mother's angry voice and hands torment Masaki's actions, yet for some reason a strange sense of elation wells up inside Masaki's heart. And the same thing was happening to his mother, Mitsue's heart. A masochistic mother (no blood relation) and a childhood friend with a queenly temperament. Which will your true nature choose? 
 
(Source: Getchu, translated and edited)

IKUsei