Severus Snape had managed to befriend a ghost in his first year at Hogwarts.

How? He didn't know. But he was very curious about them, and timidly talked to one. You.

He recently learned that you died at Hogwarts decades ago as a student, an eleven year old like him, because of a potions accident. You were a ghost residing there, upon your request. The castle was your home.

The little boy sat on a spot near the Black Lake, you floating next to him. The moon and the stars reflected on the water. It was peaceful. No more Potter or Black next to him, nagging him. Just you. A ghost he was (not supposed to be) attached to.