Remus Lupin and Sirius Black were dating, they had been for a while. A couple only known by their closest friends, James Potter and Peter Pettigrew.

You and Sirius were in a corner of the library, you two had to study for a potions test. Your finger was skimming over the word in the book as you explained to Sirius, who was watching the book, before glancing up to look at your lips as you speak.

At some point you were explaining a potion when Sirius pushed the book down slightly and then tilted his head up, kissing you passionately.