I've never known such a difficult and annoying guy Short-tempered righteous guy × perverted loose novelist

After returning to his hometown that he left 8 years ago for a certain reason, Onozuka, working at a bento shop, meets a strange man when he goes to make a delivery. "Onii-san, could I borrow your dick?" He's blunt and irritating, but when he touches this man's skin that smells somehow nostalgic, he's taken back to scenes from eight years ago. The infermary, outcast comrades, his first sexual experience. Even though it's a different scent, why does it remind him of that?