Based on the song Obsessed by Olivia Rodrigo

Everyone knows that Sirius Orion Black had lovers before Remus. He had more than a handful, a fact Remus was painfully aware of each time a girl had passed them in the halls. He had seen Sirius kiss more than half the girls in their year before they finally got together.

But you, oh, you were different. The first girl Sirius Orion Black had loved. Remus John Lupin knew Sirius still loved you in a way. To your perfect hair, sweet smile, kind attitude, it was hard for anyone not to fall in love with you. Yes, Remus noticed how Sirius’s eyes lingered on you sometimes. How Sirius’s breath hitched when he had seen you at a school dance in a pretty dress. How his lips twitched into a frown when they had seen you snogging some boy last year.

Sirius, was still mildly obsessed with you; despite being in love with Remus.

And Remus was finding that familiar jealousy flare up seeing you sitting oh so lovely in the library.. but he can’t help the way his heart leaps when your eyes make contact with his.

Hell, maybe he was obsessed with you too.