"Look…at…me…" he whispered.
The green eyes found the black, but after a second, something in the depths of the dark pair seemed to vanish, leaving them fixed, blank, and empty. The hand holding Harry thudded to the floor, and Snape moved no more.
He lay face-up, listening to the silence. He was perfectly alone, so far as he could tell. No more Potter… Nobody was watching. Nobody else was there. He was not perfectly sure that he was there himself.
A long time later, or maybe no time at all, it came to him that he must exist, must be more than disembodied thought, because he was lying, definitely lying, on some surface. A hard, poorly sanded, poorly cleaned, wood floor. Therefore he had a sense of touch, and the thing against which he lay existed too.
Almost as soon as he reached this conclusion, Severus became conscious that he was naked. Convinced as he was of his total solitude, this did not concern him, but it did intrigue him slightly.
He wondered whether, as he could feel, he would be able to see. In opening them, he discovered that he had eyes. Unfortunately, there was no light at all, and opening his eyes revealed nothing but the deepest pitch-black darkness in all directions.
He started to sit up, but immediately bumped his head on a low, sloped ceiling above his head. "Ouch!"
He wished for his wand, so he could cast a lumos for light, but instead of finding a wand on the floor, his hand encountered another body, another naked body.
"Wha…? Who's there?" Severus called out in surprise.
The body stirred… also tried to sit up… bumped his head on the low ceiling. "Ouch!"
"Headmaster?"
"Severus, my boy, where are we?"
"I don't know, but if I had to hazard a guess, I'd say a boot cupboard under a flight of stairs."
"That would certainly explain the low ceiling and cramped quarters."
"Why are we here, Headmaster?"
"I can only answer for myself, but I'm here because 'the first shall be last, and the last shall be first.' It's you who imagined the boot cupboard."
"So we're awaiting the Potter brat's demise? … In his boot cupboard?"
"Alas, yes, in all probability. I take it you saw the cupboard in his memories. Perhaps I should have insisted upon more ample quarters for him at the Dursleys."
A long time later, or maybe no time at all, they heard the cupboard door unlock, and two glowing red eyes appeared, and they heard Voldemort's voice say "Get out of there now, you lazy good-for-nothing freaks, and fix breakfast or I'll hit you with a frying pan. I've got 500 hungry Death Eater demons shoveling coals into the fires of hell and they want their breakfast now. After breakfast you can join them shoveling coal… and no backtalk you worthless dunderheads, or it'll be eternal detention in the furnace."