19 Years (HP - Drarry)
19 years ago, something happened between Harry Potter and Draco Malfoy - but the only one who remembers is Draco himself. He plans to carry the secret to his grave, but his careful plan is soon turned on its head. It's bad enough that Draco is returning to Hogwarts as a professor, so soon after his divorce, even worse that his son Scorpius has befriended fellow first-year, Albus Potter. But when he realizes that Harry Potter, too, has returned to Hogwarts, newly-single, Draco fears for his sanity.
Meanwhile, first-years Albus and Scorpius navigate friendship, classes, and getting their idiot fathers together. They are joined by their mothers, Astoria and Ginny, retiring professor Minerva McGonagall, newly-minted professor Teddy Lupin, Headmaster Neville Longbottom, Blaise Zabini, Lawyers Pansy Parkinson and Hermione Granger, a handful of scheming first-years, and the inimitable Luna Lovegood.
*mostly* epilogue compliant
-Inspired by: https://www.youtube.com/watch?v=_2CGQLVRN-A.
-Hogwarts Calendar on my tumblr at http://whimsicaldragonette.tumblr.com/19years
-Appendices added with spells and calendar.