heya

Fangs - http://www.mangago.me/read-manga/fangs/
Blood Bank - http://www.mangago.me/read-manga/blood_bank/?zCbY
Blood and Love - http://www.mangago.me/read-manga/blood_and_love/
Dine with a Vampire - http://www.mangago.me/read-manga/dine_with_a_vampire/?haNb
Bitten by Moonlight - http://www.mangago.me/read-manga/bitten_by_moonlight/
Kyuuketsuki ha shinzo no yume wo miru - http://www.mangago.me/read-manga/kyuuketsuki_ha_shinzo_no_yume_wo_miru/

Fangs is a vampire yaoi
Vampire Library and Bloody Mary are vampire shounen Ai

Definitely Blood Link, it also has werewolves. The artwork is amazing and extremely interesting!

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

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

This a list of some good ones:

http://www.mangago.me/home/mangalist/894987/

vampire BL list ^^ http://www.mangago.me/home/mangalist/896829/?filter=&page=1