There's so much to love here, I hardly know where to begin! First time, h/c that balances on that fine line between not enough and too much, Minerva's brogue, SS/MM without prettying them up . . . . Then there's the weaving in of bits and pieces from the book (like the explanation of Crabbe's use of Fiendfyre, the sword, and the ingenious saving of Severus at the end) and the little touches of magic (like Everard's wizarding whist deck with racy pictures).
I could quote half the fic, but a few places I particularly enjoyed: She landed atop him, astride his shaking form, arse firmly seated on his groin, sharp nails pushing at his chest, her other hand holding her wand to his throat. Now there's an image I won't soon get out of my head. Albus objecting to the word fuck (and rogering is a word that woefully underused, in my opinion). "Severus." Albus enquired, "I hope you did not come down too hard on them?" Snape sputtered and began to cough
Everything comes together so beautifully--plot and emotion and canon ties and interesting little hints and details. Well done!