Your Quirk needed you to ingest blood. Your class knew that, too. When you went longer than usual without blood, you craved it badly, to the point you were getting violent.

Hospitals were having a blood shortage, and you felt bad asking friends for some of their own. You tried going for weeks without it.

It didn't go well.

You were in your dorm, nibbling at your arm with sharp, aching fangs and glossy eyes, almost drawing blood. You were shaking with thirst.

Meanwhile, Izuku was watching from outside the slightly open door, a foreign look on his face.