Responses
One of these maybe? Sorry if none of them are it ;;
http://www.mangago.me/read-manga/what_does_the_fox_say/
http://www.mangago.me/read-manga/approximate/
https://dynasty-scans.com/series/black_white
No sadly it is not one of them :/ it's not such a well done manga haha, more like some publications on twitter I guess ? But I didn't know of the last one you gave so thanks a lot !
It's a yuri where a subordinate finds out that her boss is a lesbian and they start to have lots of sex, the boss has dark hair and kinda hate the subordinate (who has blond hair)