Severus Snape, at the contrary of every other muggle-born or muggle-raised wizard/witch, decided to not give up his studies in the non-magical areas, so at the end of the Hogwarts year, he goes directly to a summer school. Let's just say shit goes down this year. I do NOT support J.K Rowling. I enjoy writing those fic's and that's all. I don't support her in any way.