When Aziraphale came out Crowley just smirked wickedly up at him, his hands continuing to thump the tight skin that made the tops of the instruments. "Feel free to take your pick," he said, just barely keeping the cigarette in the corner of his mouth as he spoke. He even followed the statement by wiggling his brows behind his sunglasses.
It wasn't much longer before Crowley actually did stop banging on the bongos though, then leaned back on the palms of his hands as he continued to look up at the angel, leaving the drums in his lap for the sake of the other being's sanity. Either that or for the sake of saving that shocker for later. Not that he was shocking, but he still looked forward to seeing the look on Aziraphale's face when he wasn't covered any more.