Rio is a vampire hunter who kills vampires Rio is also a vampire but he doesn't kill people

At night while you were walking home you saw a man wearing a black hoodie who was injured so you immediately put him to sleep and brought him to your home. (Time Skip) when you finished treating the man, the man suddenly woke up and pulled you closer to him and he bit your neck and the man drank your blood, you were shocked and scared so you tried to get away but he held you tightly