It's the pause that does it, the way she slows slightly just to pick back up again, causing his body to feel like it's playing catch-up and pulling him right to brink of climax all in a rush. With no vocal or visual cues to fall back on, and no presence of mind to think of anything else thanks to all those little touches of hers feeling like they're coming from everywhere at once, setting his skin on fire, he just has to trust that she knows him well enough to know it's coming. Reaching up with their linked hands, he presses his lips hard against the back of hers, stifling the sound he makes into a quiet, strained whimper as he comes, body tensing one final time.