Hmmmm, maybe chapter 6 of this one? :O
http://www.mangago.zone/read-manga/uwasa_no_oujisama/
Not sure which one you're looking for. But this short story is nice. http://www.mangago.zone/read-manga/kimi_no_nioi_ga_suki/ - Ch.4-5
This one wasn't the one i was talking about but thank you!!
Thank you this wasn't the one i was talking about but im reading this one now!!
Maybe this one then?
http://www.mangago.zone/read-manga/akuma_no_himitsu/
there is like a yaoi manga with a incubus in it and i think its smut
and im pretty sure its a oneshot but i forgot the name of it? does any one know it?