Jack's eyes go dark with lust, both at the challenge and the change of pace. He gasps as Ianto's fingers dig into his hips, and he drops his head once more, closing his eyes, focussing on everything he's feeling right now. Arousal ramped right up by this new, self-assured Ianto, and by the powerful strokes of Ianto's cock inside him. Which, because Ianto really can't do anything wrong today, are indeed hitting him right where he needs them to on every thrust, making him shudder and pant as the pleasure starts to coalesce into something more tangible, deep inside him. He groans, and clenches just as Ianto thrusts, and cries out at the bright, hot sparks that sends through him.
"Oh, god," he pants, shaking from head to toe as he does it again, and again, his climax starting to mount. "Ianto..." he pleads desperately, just needing something more to get him over the edge.