He bites his lip, head down and eyes screwed up in an effort to maintain control. And he's holding his breath again, because she's moving faster and if she's not careful, he's going to go off before she does.

Only one thing for it. He heaves in a deep breath, exhales it as a groan and wraps his hands ever more firmly around her hips to steady her. And then he moves again, like she asked only...well, not quite like she asked. Not any deeper, and still gently but defnitely faster. Quick, shallow strokes, and he's panting hard to relieve the pressure, trying to get it out of him so it doesn't lock up inside and make him explode. He can't stay silent, but he tries not to be as loud as he wants to be. Quiet, desperate moans, to match the painfully tight muscles in his arms and shoulders.