Oh, my goodness. That was so dirty and sweet all at the same time. *melts happily*
I love your exasperated Snape! It just keeps getting funnier and funnier. I started laughing out loud when literally throws up his hands in the air (I'd love to see this illustrated!) and sits down on the bed, shoulders slumping. And then this:
Harry seemed to notice and delight in his titillation. He squirmed closer, kissing Snape’s ear. “You should spank me again, harder, Daddy,” he whispered. “I’m awfully bad and I need discipline.”
“Arrrgh,” Snape replied.
Now that, a Snape deprived of words, is the ultimate!
They really are on different wavelengths and you took it to an extreme, keeping them so incompatibly *compatible* all the way through.
This was why Snape had such difficulty with the concepts of good and evil. Voldemort had never dreamt up anything this insidious, while Potter consistently found ways to put Snape through new and beguiling versions of hell.
It certainly was delicious! Small wonder they were both back the next night... But unlike them, you never flagged for a second! The outrageous funniness and hot smex continued all the way through. WHEW!!! *collapses into warm puddle*