Vampire book where the protagonist is not a vampire; her boyfriend and brother are. I remember that the brother had a boyfriend and the beginning of the book talks about the brother walking in on them trying to have sex.
They all live together with another couple and their niece -- who is the girlfriend of this blond guy -- turned into a vampire so she wouldn’t die. Then, at some point, there’s werewolves involved and the blond one gets attacked and nearly dies,
