Haha ga Dogeza Shita Hi -the GAME- Natsuyasumi☆Kaa-san Choukyou Daisakusen!

Take control of a twistedly horny boy who wants nothing more than to train his mother into a sexual object! But be warned -- she's tough, and won't exactly take it lying down! But that's okay, you have all sorts of dirty items at your disposal to make her yours!

During dinner, in the afternoon when dad's not home, on a busy street, and even in a dirty park toilet -- you can train your mom almost anywhere! No battles! No game overs! It's a mom-training experience like no other!

[From DLsite English]