Responses
Are you perhaps referring to the Kuroneko series by Sakyo Aya?
Kuroneko Kareshi series:
1. Kuroneko Kareshi no Asobikata
2. Kuroneko Kareshi no Amaekata
3. Kuroneko Kareshi no Nakasekata
4. Kuroneko Kareshi no Itoshikata
5. Kuroneko Kareshi no Afurekata
Fukigen kareshi no Nadamekata (side story)
Yes!! That's it :D Thank you both very much!
Looking for a yaoi/shounen ai manga, I think it might have had something to do with cats... I know that there was an actor and a back stage worker with long blackish hair.