Hi, the uke has a thing for scents and only goes for partners who smell nice. Seme is his coworker and he hates his scent since he uses too much cologne. They all go to a drinking party but seme turns up late as he had to take a shower and uke finds his smell really attractive. Uke invites him out again, asking him to shower beforehand as he wanted to confirm the nice smell. Seme has the perfect scent and they end up becoming a couple.

Edit: I found it! Koisuru Futari no Taion \o/