My Adorable Boyfriend Can't Find Out!

Synopsis

Naoki (36) is a workaholic who's never been in a relationship. Then he meets his first boyfriend, the cheerful and animated Minato (21). Desperate for Minato's affection, Naoki does everything he can to maintain that mature, confident and perfect boyfriend. For some reason, though, he keeps on rejecting Minato's invitations to have a bit of good ol' intimate fun. Could Naoki be hiding something from Minato...? (Source: MangaPlaza)