There was a moment of confusion where George had to figure out what Lydia wanted from him to do and then how to accomplish it without taking his hands off her in any way. This proved impossible, and the hand on her back had to go to the bed to push himself up. This caused a lapse in his concentration so he was able to watch the entirety of her orgasm from up close, which fortunately had the side-effect of helping him catch up a bit, though he still needed another moment.
"Hot," he gasped, still working his hips against hers, "don't stop." He let his head hang back, eyes closed, panting, just a few more seconds and then he moaned loud to the heavens, hand on the bed contracting. And then, with it all flushed out of him, he fell back as though he'd turned to jelly.