Kohichiro Takashima's Perfect Lover

Takashima works in sales. One day, Kitamura, a kouhai at work, finds Takashima's cellphone with his own face as the wallpaper. Takashima wants to keep the fact that he is a narcissist secret, so Kitamura agrees to be discrete if, in exchange, Takashima becomes his sex friend. What will happen when Takashima discovers that Kitamura suffers from erectile disfuntion?