It definitely is not sustainable if they are going to actually go anywhere, and Istredd knows that. And he does want them to go. He may be nervous and maybe intentionally trying to build up his confidence, make himself feel bigger and better than he is. Being Lucifer's chosen does give him that ego boost he desperately needs at the moment.

He sighs and smooths down Lucifer's clothes from where he was just gripping a little too hard, gesturing for the coat. "Put it back on, troublemaker." Istredd does intentionally muss Lucifer's hair even more though just because, although it only looks better on him, which is truly enraging. He makes an annoyed tch noise about that, while sharing with Lucifer mentally why.

"You are not going to distract me. Dancing with you will be a reward for putting on a good show." See if he can focus on being on the other side of that attention, and maybe make Lucifer a little proud of him, he can get through it. Once he actually begins, Istredd will seem perfectly confident and competent, using magic always is so much easier than getting himself there.

"Stunning, you said?"