If any of those things had happened, then Prompto would have had two milkshakes. He'd have to then maybe spend an extra hour in the gym, but he needed to do that regardless. This would hardly have been a backfire, and, therefor, it was a risk he had been incredibly willing to take.

And locking the door when he'd expected a full-on burst through would have been silly, as well. He'd have been disappointed if Nina didn't burst through, and he was quite prepared for it, though, he had to admit, that had worked even better than he thought. That was...quick. Which was good. Less melty milkshakes!

So he felt even more justified in his absolutely shameless chuckling, sipping from his own pointedly through a straw before grinning at her.

"But it worked," he pointed out, "didn't it?"