“I know Malfoy is involved somehow! You must know something, Severus, why won’t you tell me?”
“...Because there’s nothing that can be done.”
“How do you know!”
“...I know.”
Snape feels something touch his hand while seated at Malfoy Manor and nearly has a heart attack. It was just Nagini sliding by. Someone (Bellatrix) makes a crack at him for being jumpy.
But it was just his conscience.
“No. No no no Severus I can't lose you-“
“You have to.”
“I can’t… I can’t…”
“You must. Harri, the night I lost Lily, I... every day. Every single day after, I wanted to follow her.
But then I met you.”
“Severus…”
“I know how it's going to feel, Harri, but you must. You must. Live. Harri.
Please.
I'll always be waiting for you.”