Something fun for Hermione? Het. School years preferred, but would also do something post-war, maybe even time turner mishaps leading to marauders era shenanigans. Sneaking around, adventures, making this one break all the rules because it's thrilling.
The usual boys, Draco, Harry, Ron, or unusual parings, Marauders, Neville, Snape, order members/death eaters turn good...basically, if you have a HP boy or two, throw them at me. I'm sure we can figure out a plot.