Father Fucker

Synopsis

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. In Mei's eyes, Shin resembles Makoto more and more every day. He's aware of Mei's hidden feelings, even though it's just his body that Mei wants. (Source: Sankosha, translated)