In Over My Head With A 23-Year-Old

After splitting up with his friend with benefits, he's just been building up stress with no outlet, and so police officer Ritsu spends every day working at the neighborhood police station bursting with irritation. When a chance encounter brings him to Naoya - a man who's got Ritsu's ideal "package" - his irritated mood does a complete one-eighty. His skin is glowing, his spirits are high, and everything's coming up roses... or so he thought?!

(Source: MangaPlaza)

Note: Includes one extra chapter.