Loli Kyonyuu Hitozuma Nakadashi Kaigo ~Otou-san, Ramee! Sonna ni Tsukaretara Ano Hito no Toko ni Modorenaku Nacchau~

A father let his son move home during a time of crisis.
It wasn't because he was charitable; he really wanted to f*ck his son's wife!
A life under one roof means she has to care for him and be harassed,
but it's too much. What if she gets pregnant? What will she do then!?

Poor son is a cuckold with no clue... his wife is making a family with his father!

[From DLsite English]