Just as soon as he'd answered his need, he felt Jack move forward and discover him all over again on his own. He barely held back a groan of deep, deep satisfaction at the sensation of Jack finally surging into him, and his hands turned white-knuckled as he held on, while his legs took possession of the waist just above him, claiming it as his own, if only for minutes. His arms soon released their tension around Jack, one moving down to the small of his back to encourage him on, the other up, grasping behind his neck. He took hold with both of them and squeezed with his fingers, digging them gently into skin, wanting to make sure Jack felt just how intensely he was driving him at that very moment.
It was all he could do, that, and draw his knees further back to counter Jack's increasing pace. Until they had started all this, he hadn't realised he was quite so flexible, but Jack seemed to bring out hidden talents in people. Jack had a few not-so-hidden talents of his own, too, and in this instance he was using his particularly brilliant one, of being able to hit Ianto's prostate on almost every thrust as he buried himself deep. Ianto already felt the familiar build-up from the base of his spine, and knew he was close, but he watched Jack when he could summon the focus, sliding his hand down over the beads of moisture that formed on the side of the captain's brow, coasting it to his jaw and the strongly-lined mouth that cried out to be kissed.
He moved his hand out of the way when Jack leaned in, and the lips that found his layered the act with an intimacy that shot to his stomach, and had Ianto forcing Jack to capture a whimper against them. He firmly chose to clamour down the awareness that the feelings which went beyond flesh and heat, at least for himself, were more one-sided than he liked, and instead he arched his whole body to get as close to Jack as he could, skin to skin, sweat easing the friction as they writhed together.
This time, with Jack's belly pressing against him with each movement, he didn't even need a hand on him to bring him to where he wanted to be with quivering muscles. This time, he was too impatient to dance to the brink of the precipice they both sought, to dance and to backtrack and to dance again. Not this time, not right now. He bucked under Jack as best he could in a heated attempt to pull him in deeper, deeper still, and in that moment, Ianto turned to look at him and the gaze that had known him better than most, and it sent him over the edge to a temporary oblivion - breath and heart caught in his throat, and he was trying to catch the air back into his lungs - then everything released - he seized Jack to him, gasped, and threw himself headlong over the peak of his climax, squeezing Jack's thighs between his as well-worked muscles tensed, coming hard and barely acknowledging the warm splashes he spilled between them in the height of his rolling, thunderous pleasure.