"You stop now, Lieutenant, and I'll never forgive you for it," Ianto said, realizing that he was being a bit dramatic about it all, but really. He was getting really rather worked up again, and to have the other man stop and drag it out even more might even border on being cruel, as far as Ianto was concerned.

To be honest, if Ianto knew that Sulu thought that, that he might be able to get off to the sound of his voice alone, he'd be willing to give it a go sometime. Maybe not that moment--he had other things on his mind then--but at another point in time. Ianto recognized what Sulu was trying to do, with the shifting of his fingers, and while...well. He was getting pretty close, he wasn't getting it exactly right. Might as well start on that instructing, then...

"Here. Further down," Ianto prompted, shifting slightly, opening his legs wider and shifting his knees up higher. "More...ah," he said, trailing off for a moment as Sulu almost got it. "Forward. More forward. More ff-hnnngh." Ianto's instruction cut off abruptly as the other man finally hit the exact spot, pressing hard enough for his words to be reduced to nothing more than an almost guttural moan at the feeling of it, Ianto's hands clenching slightly as he did.