Dean just decided to ignore Seamus' cute name calling, clearly it was only to wind Susan up. They'd decided that they were going to do that as much as humanly possible. He did smile at Susan's reaction though, just a tilt of his lips and amusement playing around his face.
"I will grovel, of course. There are cookies, which, yes, Curly, are perfectly normal lemon," he said, winking at Seamus. "I was making two things at once, and too many ingredients only confuses things." He noted, with a jolt of a growling stomach that he probably hadn't had any calories in non-liquid form since breakfast. "Is there any other way that I can grovel, my lady?" he asked, mock bowing to Susan.
"Also, you are a goddess, and I will be needing one of those brownies as soon as possible." He did love a good brownie, and they weren't the easiest thing to get right.
He glanced around once more and nodded. "Ready to go, need to ward it all behind you, especially since I'm the only one in." He needed to step out into the corridor to finish all of the warding, but thankfully it would only take moments once they were gone.