Kyonyuu Oyako-chu Dashi Dokyo Seikatsu - Bijin ni Sodatta Shinseki no Musume to Sono Hahaoya o Haramase Onaho ni! | 巨乳母娘中出し同居生活 ～美人に育った親戚の娘とその母親を孕ませオナホに！～

The protagonist is not popular, has a low income and is still a virgin, but his sexual desire is stronger than anyone else's. He lives a life filled with lust every day for Yae, his brother's wife, who is the opposite of him, a high-income elite and her daughter Fumino.

One day, such a younger brother has an accident. The protagonist, who took his place in the name of protecting his career, uses this to approach Yae and succeeds in having sex with him.

Yae, who is serious and uptight but has a hidden masochistic nature, is treated like a masturbator and climaxes many times and falls into a state of degradation. Yae, who has become a convenient masturbator, is forced to offer her daughter Fumino as well... This is how the dream life of impregnating the most beautiful mother and daughter as he pleases begins.