A Study in Transfiguration (слэш)

“Ravenclaw common room. Come at once, if convenient. - S.H.”
John shook his head and blinked down at the note again. It was well after hours, did Sherlock honestly think that he would hop out of bed and come practice turning mice into elephants in the dead of night?
John Watson is a Seveth-year Gryffindor student. He and that strange Ravenclaw boy, Sherlock Holmes are partnered together to practice Transfiguration (Hogwarts AU)