http://www.mangago.me/read-manga/katekyo/ (well there's a scene where the seme is kind biting the ukes inner thigh and uke tells him not to bite his penis haha)
http://www.mangago.me/read-manga/hidoku_shinaide/ (pretty sure this manga has biting and probably other works from her have biting)
http://www.mangago.me/read-manga/hetalia_dj_aru_otoko_no_haiboku/ (i remember this one has a bit of ear biting while they are doing it though it's a short part)
Try Totally Captivated
http://yaoihavenreborn.com/doujinshi/kamitsuki-kei-shoukougun (Filled to the brim with all kinds of biting. Neck biting, a little bit of nipple biting, it's hot as hell.)
Holic-chan has a collection i think. I'll be back with the link
here. you can choose from a lot of titles http://www.mangago.me/home/mangalist/57936/
Beast feast has teeth scraping and I think biting.
Yaoi with biting in a sexual way?