https://www.mangago.zone/read-manga/kuyuru/
idk about this but it's about smell
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If you are good with yaoi. I don't remember if they get off to the smell of the other person but these are the scent kink/fetish manga that I have read and liked. Otona Keikenchi, Kimi Note (Yaoi), Body Talk Paradox (Yaoi)
And these 2 are on my Want to read list so I haven't read them yet. Smell Fetish (Yaoi), Kanchigai Tokidoki koi (Yaoi)
Summer season have a scene where the seme is fapping while sniffing the used uniform of the uke. It's in chapter 9. Hope this helps.
Looking for manga that has a scene with one of the characters getting off to the other's smell? Like sniffing clothing or their bedsheets or something? Not sure if this makes sense, sorry if not! ⁄(⁄ ⁄·⁄ω⁄·⁄ ⁄)⁄