This was easy for Klaus, giving up these parts of himself, being the person who was more than eager to get into bed, the one you shared heated moments like this with. Klaus didn't fumble even a little as he and Bill came together, Bill's arm around his waist and the taste of his mouth heady on Klaus' tongue. Bill wasn't some stand in either, he didn't close his eyes and imagine himself somewhere else, with a different body pressed against his own in moments like this. He was too different for that, taller and stronger, the way he carried himself was different too. Klaus was fully aware of who he was with and wanted Bill all the same.
He hummed lowly, pressing up to meet Bill when he leaned in closer, making it just that much easier for Klaus to kiss him the way he wanted, hungry and deep, licking into the heat of his mouth and savoring every bit of it. Letting the thump of music fade away into something less jarring and instead focused himself right there. Feeling the beat of Bill's heart and letting that center him and keep him there in the moment.
"Knew you'd be good at that," He breathed right there, still pressed close, not quite ready to put any distance there. He kissed Bill again, not with the same amount of intensity, but no less eager before he pulled back again. He was tempted to pull Bill into some dark corner, there were plenty of them here for just such things, but he wasn't quite ready to give up this part yet.