https://archiveofourown.org/works/28096467/chapters/68840154

"Hermione," he hissed, "I smelled Dior Sauvage." Her eyes widened, but she tried to play it cool, "I'm sure lots of people wear Dior Sauvage, Harry," she tried. 

"Not like this they don't."

 It was meant to be a harmless joke. When Pansy and Blaise replaced Potter's Amortentia vial with Draco's cologne to fuck with them both, that is. But they couldn't have imagined the enormity of the consequences their prank would have.