Draco's jaw worked, his hand too, and he had to fight the urge to have his wand in his hand - to hex Potter with the worst thing he could think of. He stopped himself - and then he wondered why he stopped himself, and he had the grudging urge to leave without comment, and it took him an oddly long minute to realize that it was that strange doubled feeling he'd had for months.
It translated to his glaring at Potter without answering for far longer than was normal.
"I don't think I will," He said finally, but it lacked his usual bite.