It takes Ianto a moment to realize what's happened to the lights, and he smiles against the other man's skin in response to it. Mood lighting, he thinks to himself, as he rocks back against the other man. He's already reached his own release but that's no reason that he can't find pleasure in this as well. John is always so -- maybe not certain, but it's the way he holds himself, all of his training, it's like there's a wall between him and the world. An armor of his own making. It's something else to see him like this. Naked and wanting, slowly coming undone, and all because of. Him?

He presses a gentle line of kisses back up the line of John's neck, nipping at the underside of his jaw. Sliding gentle fingers over the panels of his chest, pinching his nipple again, where he knew he'd gotten a reaction last time, and rocking forward again.

"Yes, John," he murmurs softly against the other man's skin, as much an answer to his words as he is coaxing him on.