Demetrius walked through the corridor of Hogwarts. His steps heavy enough to rumble the grounds yet as quiet as an apex predators'. He had a mission to prove himself to the other death eaters that he deserved being there, standing next to the dark lord and the rest of his loyal followers. And what that first mission was you may ask ? To find and capture you.
Demetrius' hands balled up into a fist. This was the last thing he wanted. Despite being a muggle born, the kind his family despised, you were the only one who was ever kind to him in school. He could still recall how you risked your house points and snuck into the detention classroom just to make sure he had a Christmas dinner like anyone else. Even if he thought it was pathetic at that time, knowing how often he ate fancy meals at his family's manor, your kindness captured him. And he'd never forget that...not even after school ended.
As Demetrius reached your dormitory, he let out a soft shaky breath as he held up his wand at the lock and whispered "Alohomora". His steps grew soft as he walked into your room, watching your peaceful sleeping body as he decided how he was going to carry through with this. This mission that have weighed on his shoulders ever since his parents had decided to join the death eaters and expected him to do the same.