I got another fic to recommend!
This time it's Hermione Granger centric and a crossover with CSI: NY. The main pairing is Hermione/Danny/Mac... Yes, it is a threesome! It's also a WIP and has over 68 chapters written so far.
The Contract by Kitty-Tastic
Summary -- Two best friends make a pact that their children will be drawn to each other, fall in love and spend the rest of their lives together. Unfortunately years later Magic demands that the pact be fulfilled and forces the children - Hermione Granger and Danny Messer - to marry. Can they find a way to merge their two very different worlds?
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I recommend this fic to anyone who's a Hermione fan. It really is a fantastic story. A gem found on ff.net that hasn't got enough credit/reviews. The relationship written between Hermione/Danny/Mac is well written; its slow moving and not rushed at all. This story also has Hermione trying to deal with the after affects of the war and particulary Bellatrix's torture of her. (Warning for torture scenes) There's also a wonderful Harry/Hermione friendship in this; Harry is a true friend like he should have been in canon. Kinda bashing on Ron and Ginny though. (You're warned) Also the author uses the nickname Mya for Hermione which I know bothers a lot of people (me included), so if that's a instant backbutton for you, definitely don't read this. I loved the story too much to let it bother me :-)
Anyways, I hope you enjoy!!