"Sometimes, he knew, he still conjured things in his sleep. It happened periodically to most wizards and witches, a byproduct of dreams and magic."
What an absolutely BRILLIANT concept! I hope you will incorporate it into another story? :)
Your euphamisms and descriptions were fun, including:
"This had never happened before and he was rather mortified, especially if there was a ghost watching him, because he did not want anyone to think he was skint in the smalls, much less unable to extend his wand, even if they were dead."
"Harry lifted a brow at this, then his face got the expression she had not seen on it in many a year. It was the same expression Harry used to get when he had spotted the Snitch."
"Severus Snape discovered he could blush just as well as any maiden if the situation, or something else, arose."
And if there was an award for 'best rendering of Eileen Prince Snape' you should get it! She was hysterically funny!!!