vampire

CW: pseudo incest (adopted), sexual assault
Yousuke is a boy who at an early age loses his parents in an accident and is later adopted by Mei's parents. Mei is a young vampire who enjoys drinking Yousuke's blood which causes him to constantly cause anemia. But one day everything changes in Yousuke when he suddenly goes into heat and a wolf's tail and ears appear to him. Being the appearance of a strange young man the causes of these changes.