Mama Club Member D

There are more than a dozen adult members but only four appear in the visual novel. No proper name has been established for any of them. They all have sons and are married women in their 30's. They satisfy their own incestuous desires with other people's sons by joining the "mama club". They always respond honestly to the desires of the boys', sometimes gently, sometimes harsh. They tend to take the lead with Yuuichi who is a beginner and provide him the appropriate sex education. [From official site]