If I'm not wrong, it's a series from minase masara. Try looking for that author. The cover of the manga is red in the background. Hope it helps!
http://www.mangago.zone/read-manga/joushi_to_ore_no_himitsu/
haven't read it myself, just a reverse search of the authour if it helps ╮(￣▽￣)╭
Yup, that's the one :)
Uhm...its not what I've been looking for. But thank you for the effort!
I am looking for this yaoi manga, i forgot title and the details of tge story but i remember that the uke is black hair, skinny, wearing glasses and working in office. He was played by seme then he worked hard to forget the seme. I've been looking for it for almost a week alread. Hope you could help!