The uke's father died and left uke to be adopted by his boss (?), the seme. The seme has a twin brother (secretary).
I remember a yaoi manga about humans with ears and tails. The uke has a younger brother, everyone said the younger brother should be the one who inherited the family wealth, not the uke, because the uke is not a perfect cat(?). The uke has short tail. The seme finds its cute.
There's a yaoi manga that stuck in my mind. It's about supernatural creatures, I think. If I remember it correctly, the uke is a succubus. It's a slutty plot actually. The uke was the seme's father's lover at first. There's a chapter where the uke changed into his young form & the seme got jealous saying "Damn that old man (his father) taste this you (the young version uke)"
The father loves the uke & seme, a bit comedic there. The father is like doting parent.
The seme is a firefighter. He had broken hand. That's all I remember :")
Maybe you can find from the tag? http://www.mangago.zone/tag/Firefighter/
thanks imma check it out :)