Yaoi/shoujo/romance with something coming to life.

Here is the first one to read
http://www.mangago.me/read-manga/tsuki_ni_hoero/

http://www.mangago.me/read-manga/kuroneko_kareshi_no_amaekata/

http://www.mangago.me/read-manga/kuroneko_kareshi_no_asobikata/
And check out her works too, she writes a lot of mangas including werecats

http://www.mangago.me/read-manga/nekoka_danshi_no_shitsukekata/

I'm not sure, what're looking for...
If I get it wrong, then just ignore mine reply. :D
http://www.mangago.me/people/tag/2337/Cute+Pet/
http://www.mangago.me/people/tag/2337/Shape-shifter/?page=4

Thanks XD