Responses
Hi! Try these:
http://www.mangago.me/read-manga/hatsujou_kemono_biyori/
http://www.mangago.me/read-manga/kuroneko_kareshi_no_asobikata/
http://www.mangago.me/read-manga/my_one_and_only_cat/
http://www.mangago.me/read-manga/eto_irokoi_zoushi/
^ Not exactly catboy but his soul is connected to a cat so he acts like one
If you want to find more, try these tags:
http://www.mangago.me/tag/cats/
http://www.mangago.me/tag/catboy/
http://www.mangago.me/tag/cat%20boy/
Hope you enjoy!
Catboy type stuff like Mypurrfect husband. That's it.