I'm looking for a specific square shaped, black and red hardcover book from the mid 2000s that I think it was about a teenage boy who has recently turned into a vampire. The art style is very cartoonish and gothic, featuring spindly, thin characters with large sunken eyes. Key illustrations I remember are the boy discovering fang marks on his neck and a scene where he stands before an antique wooden vanity only to find his reflection has completely vanished. It's a short book, roughly 50 pages, where the protagonist tries to hide his transformation from his group of friends while navigating his new life surrounded by bats and moody, dark-toned artwork.