vampire yaoi

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

read the sequels!!
cat shifters

if with "hardcore" you mean like porn :

http://www.pinterest.com/fuj05h1xxx/yaoi-smut/

i bookmark the manga i read on pinterest. you can find a list there of hardcore/porn yaoi ;)

pay attention some of them are like *what?!? TAT * and i also didn't like all of them :)

if you don't want to look : maki murakami (if you like or can stand gore kanpai dj...), zaria !!! (my favorite is "pet ---something---", there is a threesome), menatiko (between bara and yaoi if you like guys with muscles is ok. just try priapus <3).

also nor hardcore like the other mangakas i listed but also ike reibun!! i love her works. they have a plot!!
(ike reibun is somewhat similar to sakyo aya)

sooooooorrryyy didn't see "vampire"

none of the one i suggested fit your request , sorry :)

Wild Rose and Wild Fang series, Hyper Love Power, Risky Crime, Necroholic, Vassalord...hopefully that'll give you a few to read or check out.

Btw two thumbs up for the Kuroneko series for good shifter action. :)

1 of my favorite vampire yaoi, but i not sure if it is hardcore.

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

'-'