「 or a story in which Remus works at the local library where Sirius and his annoying friends keep coming to work on their projects.」 Remus Lupin just moved to London, due to his mother's sickness and the fact that the best treatment for her can only be found here. Since his mother's obviously unemployed and his father...
The instinct not to breathe underwater is so strong that it overcomes the agony of running out of air. No matter how desperate you are, you won't inhale until you're on the verge of losing consciounsness. Sirius knew that. He stood there, staring down to the black, cold water and pondering, would it be easier just to...
"Who are you texting, Mr. Black?" / Remus and Sirius are both teachers, who happen to hate each other. It doesn't help that their students ship them.