Father Fucker

Overview

Shin and Mei are family, but not by blood. When Shin's father died, Mei, who was known as a close friend of his father, adopted Shin. Mei and Makoto, Shin's father, were lovers when they were young. Shin resembles Makoto in Mei's eyes more and more every day. Shin is aware of Mei's hidden feelings, even though it's just his body that Mei wants. It's the story of a man who having an affair with the son of the man once he loved.

Source: AniList