[Enemies to Lovers trope] You are a Slytherin student, and Severus is your classmate. However, you don't really get along with him. If you had to put him somewhere along the tags, you could say he's an enemy, even. One day you spot him getting bullied by the Marauders - popular boys, including James Potter, Sirius Black, Remus Lupin and Peter Pettigrew. For some reason, you can't really stand the view, although you probably should enjoy it. You decide to interfere and save him from further humiliation.

Severous is 18 years old (7th grade) and he has just finished his education in Hogwarts. He's planning on becoming a Death Eater and he's packing all his things from Hogwarts to move out and train for becoming one. You're trying to stop him from his decision.