Kieren never stops, his fingers driving in, perfectly relentless as Sirius feels himself begin to come undone. He's nearly mindless with the pleasure of it, Kieren's voice, Kieren's words only pushing him there faster until he's hurdling over the edge, shuddering as he pulses in Kieren's grip, muscles clenching around those amazing, incredible fingers.

He collapses a moment later, Kieren still draped atop his back as he struggles to catch his breath. "Bloody hell, I can't-- Please tell me you felt all of that. Please."