Blood and Water — Judd Winick

Adam Heller is dying, but before he can take the big dirt nap, his best friends offer him a chance at immortality and he takes it. Now Adam is a vampire living it up on the wild side and it's everything he could ever want. But the eternal party crashes to a bloody halt when an ancient monster awakens from the dark, forgotten places of the world and comes looking for Adam. The startling reason this monster has come looking for him may be the most horrifying realization of all.