Remus Lupin had spent years regretting his actions as a teenager. More specifically: allowing and participating in the Marauders’ bullying of you. He thought the past was in the past, that he’d learned how to live with himself. That was until he came to wish the new Ancient Runes Professor a warm welcome. And then he saw you. And now the past can’t stay the past, and the feelings he’d long since buried come rushing back full force.