Silently Comes The Night by Douglas Robinson
Majken, a female vampyric person of indeterminate age, comes to Trenton seeking a new life. Appearing as a young woman, she chooses a college to live and a friendly young athlete to help her meet and select the people on whom she depends for fresh blood. Her boyfriend Thomas Kline does not know who or what she really is and falls in love with her student alias. But an obsessed blood donor, a killer vampyr in the city reigning terror, and an angry college professor trying to uncover her past makes it impossible for her to keep her secret and places her and Thomas in the crossfire where she must fight just to keep him alive.