I remember reading a shounen ai manga awhile ago, but I can't remember what it's called.

Most of it takes place in a school.
Guy1 is in some sort of club where there are animals and such.
Guy2 somehow ends up hanging out there, and reminds Guy1 of a cat (? if i remember it right).
There is also some part in the manga where a cat they take care of get kittens.

I think the relationship thing was quite slow developing.

I'm sorry I don't remember much.

Maybe Sono Koi ni wa Wake ga Aru ?
Maybe not, though.

Ah yes!
Thank you very much!