This is a really funny, really canon Snape. And I really like this premise, a lot, of helping them move on.
You created not just one world, but, you know, three. Great job with the old timey dialog and stuff.
Nick's mind whirled, so full of shock and glory, it took him a moment to respond. Benedict was not subtle, but very earnest, pressing their mouths together as he must have seen young lovers do, in the meadows about the monastery. UNF. I really love this bit. Your description is really fun.
"Mind? Goodness, my Darling! I find you superlatively gorgeous - in every respect!" - This captures the spirit of the exchange so well. :-)
Benedict writhed and gasped as hitherto alien, exquisite sensations coursed across his skin and arousal arched within his blood. His hair a halo upon the pillow, his face flushed and bottom lip held just-so between his teeth, Nicholas was certain that heaven itself could not show him a sight more beautiful. His pale chest and the perfect curve of his belly - soft and relaxed as he lie in pleasure - spoke of innocence itself; pink and milk-fed-smooth, never sullied by unkind remarks or the cut of breeches that are too tight about the waist. Oh dear god is this ever HOT. GEE.
I was so sad when Benedict poisoned himself. D:
I really enjoyed them realizing their feelings and then moving on. I like that it kind of helped Snape too. Really neat.