MC(uke/cat) has a habit of picking up things since childhood and one fine day he brought a little kid(seme/bunny) with him which shocks his parents again.. soon after the kid's mother arrived and turned out to be a real bitch.. so the MC family decided to adopts him .. and thus begins the love story of aniki and his adoptive little ikemen brother...
Usagi to Neko no Hatsujou Jijou