Yaoi manga has monsters`like having ears an etc`but they`re good to their lovers? like thi...

I'm not sure if you consider devils' monsters, but if you do this might be a good one. http://www.mangago.zone/read-manga/konya_mo_nemurenai/

yaoi.monster.good partner.

http://www.mangago.zone/read-manga/bouzu_to_kumo_buddhist_priest_spider/
http://www.mangago.zone/read-manga/yondemasuyo_azazel_san_dj_gouman_doragon_to_kaiinu/
http://www.mangago.zone/read-manga/tatsu_no_otoshigo/
http://www.mangago.zone/read-manga/maou_no_amai_keiyaku/
http://www.mangago.zone/read-manga/neo_arcadia_yami_ni_saku_niji/
http://www.mangago.zone/read-manga/kitsune_no_tama_yobai/
http://www.mangago.zone/read-manga/itsuwari_no_mori/
http://www.mangago.zone/read-manga/akuma_de_keiyaku/

Not sure if this is what your looking for or not but:
http://www.mangago.zone/home/mangalist/100950/

You're cute

uwaaa.. thank you... ⁄(⁄ ⁄·⁄ω⁄·⁄ ⁄)⁄