Kisei Otoko -Hitozuma wa Itsu no Ma ni ka Ore ni Kisei Sareteiru | 寄生男 ～人妻はいつの間にか俺に寄生されている～

A protagonist with very special powers. Its power cannot defeat the empire or save the world. You can...

"To make the woman I attacked and her close family members [take] for granted that I'm there."

Of course, this "normal" includes having sex freely with the women of the house. The protagonist attacks and manipulates a woman he finds on a street corner.

"I think I'm going to stay at this guy's house for a while."

So I let her lead me to her house, where I found her sister, a married woman. The manipulative woman was living at her sister and her husband's house. A married woman and her sister. A new parasitic life begins for the protagonist, who can free two women.