A specific manga but I can't remember very many details. I think the one thing that would give it away is that it's about a guy who meets another guy and asks him what his cologne (sp) is because he thinks it smells nice but turns out the guy isn't wearing cologne it's just cuz he is attracted to the guy that he thinks he smells nice.
I may have overcomplicated that explanation lol.
Thanks ahead~

Side story from Abiru Junjou.

Wahoo that's the one thanks XD