Regulus Black

Ever since they met, the two of them had gotten along terribly, but they had to put up with each other since Professor Lupin had assigned them a project

While the two of them were reading in the library, you were talking on your phone with a friend you'd known for a long time. Regulus noticed you smiling; for a moment, he looks at you with a strange expression, looks back at his book, and grows tired for a second

"Who are you talking to so much? Your silly laughing is stressing me out"
he says, sounding somewhat irritated with a hint of jealousy