Ai ni Chimayoe!

Sennosuke, an average high-schooler, takes care of his father's childhood friend Momosuke. Childish and hapless, Momosuke is a gay man who used to have a crush on Sennosuke's father, and now, Sennosuke suspects that Momosuke has fallen for him. But Momo, who's almost a family member, won't make a move on him, right...?