Pathos

Ace, a human teenager, has been raised by King and Jay, vampires who have lived an eternal lifetime. As he grows up, he became attracted to Jay and Jay also comes to yearn strongly for Ace's blood. King and Jay, afraid that their secret will be exposed, decide to send Ace away to a boarding school. But when Ace finds that out, he wishes to be a vampire like them.
Sadahiro Mika's Gothic love story about the growth of a teenager who's raised up by vampires and the feeling of a vampire who live in eternal life.
(from the cover)

Also contains two additional oneshots:
1) Deep Throat (beware, this is also the name of the extra at the end of volume 1 of Pathos, but it's two different releases);
2) EX.