Adult PC Game: My daughter's best friend - If my daughter and wife find out Final by Appetite Eng Archive

While his wife is away, ordinary salaryman Seiji Yusa hears a clap of thunder followed by a knock on the door. His daughter Mayu and her best friend Rena were caught in a rainstorm and are soaked to the bone. Mayu goes to take a bath, leaving him alone with her provocatively dressed friend.
Rena is a virgin, but has always had a crush on Seiji. When the power goes out, Rena decides to make a move on the married man.