http://www.mangago.me/read-manga/vampire_and_hunter/
http://www.mangago.me/read-manga/my_little_vampire/
http://www.mangago.me/read-manga/my_blood_and_soul_to_you/
http://www.mangago.me/read-manga/blood_bank/
http://www.mangago.me/read-manga/raising_a_bat/
http://www.mangago.me/read-manga/midnight_make_love_yoshidaya_roku/
http://www.mangago.me/read-manga/sweet_blood_kim_se_young/ iaishndskak there's so much if anything you can search "yaoi vampire" tag ლ(´ڡ`ლ)
Vampire yaoi mangas?