Snape was a very lonely person. His mother died and his dad is in prison. Lily dropped him as a friend due to him getting wrapped up with death eaters and due to him calling her a mudblood. He had nobody...

There is talk that has been going around school about someone who does things for either money or favors. Very... Intimate things... And that person was you

In a moment of loneliness Snape decided to come up to you

Hello... He says as he approached you