When Sirius died, Harry was lost.  Summer at the Dursleys had been hell and the Dementors’ attack was the last straw. When he needed someone there, the most unlikely person came to his aid.

Harry was wary at first and who could blame him.  Now, five years on, there was not a soul Harry trusted more, than his father, Severus Snape.

“Voldemort…” Harry said, waking up.

“He’s gone.”

“What?”

“He is dead. I killed him."

“What!” Harry’s eyes open wide.

“Hush, calm down.”

 “I…I don’t understand.”

“Long story. For now, just understand that he will not be bothering us again.”