Its yaoi. and I believe it has something to do with yakuza. There is a guy who appears to be kidnapped by yakuza and he is held in a room in bondage with a toys stuffed in him and the "boss" is trying to make the guy fall in love with him. well he escapes and runs back home to find that his family left him.
Haha. Found it~ http://www.mangago.zone/read-manga/aibu/an/aibu-chapter-1.html
So here is what I remember. there is a guy who joins a company and he is assigned to a guy. He puts on a cat ear headband and pretends to be this guy's pet.
http://www.mangago.zone/read-manga/suteki_na_kigawa_ga_nakuttemo/ im not sure if is this
so it is. Thank you.