Pet Play?

http://www.mangago.me/tag/pet%20play/

Is yuri fine too?

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


And the yaoi (though most of yaoi only have 1 scene of pet play........)

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

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