An Unexpected Lesson (слэш)

Sherlock is 17, in the lower Sixth in a public school he does not want to attend, and is immensely proud of not having presented as any secondary gender yet. When Alpha John joins the staff as the school doctor, he is not only intrigued despite himself, he finds his body reacting in ways he hadn't predicted or was prepared to handle. That he might be able to cope with, but the jealousy he experiences when he finds John to have a girlfriend pushes him to do things that are far from wise.