Things were so simple as a child, but life changes that. Hermione knows more than anyone, so does Draco. Both of them are lost in emotional turmoil, they are the ones that aren't supposed to crack. Then stumbling upon each other, they realize they may not be so different after all; and that changes everything.
The war had been won, but the repercussions ran deep within everyone. Hermione Granger especially, she shut off from people, even Draco. She began keeping all of her feelings a secret, but she's not the only one. Draco has secrets. Lucius has secrets. Its only a matter of time before they unravel and a Dark force emerges. Everyone will be tested. Everyone.(Sequel)
After being tortured in Malfoy Manor, Hermione is saved by Draco because he is Veela and she is his mate. She has to make a choice, stay or go. If she stays, wouldn't she be in danger, and what about the mission Dumbeldore sent them on? Wouldn't it be going against everything she had been fighting for, for the last 7 years? Its too much, and decisions always have consequences.