Fourth Year, Tri-Wizard Tournament
Harry desperately searches for anything that can help him face the Horntail. Finding an obscure book on dragons, Harry finds something that he thinks can help him.
As Harry walks out to face the Horntail, he stops in front of the dragon and begins a series of strange movements. The dragon stares at the erstwhile tiny being in front of her. She does nothing as Harry quickly nicks the Egg from the nest. As Harry leaves, the dragon stares intently at his retreating form.
Harry doesn't realize it yet, but he has just seduced a dragon...