I think the only manga with a pair of ears that I have read before was Playboy Beast
All of the Kuroneko Kareshi series plus spin offs, & Ai o Ataeru Kemonotachi are the ones with either a pair of human ears in their human forms or animal ears during mid transformation(๑•ㅂ•)و✧
I think the only manga with a pair of ears that I have read before was Playboy Beast