His eyelids went between states of closed, states of open, and everything in between - pausing, fluttering, sloe-eyed. Shoulders rolled back against the desk and he flexed his neck - now and then a breath escaped him, formed by the amazing things Jack was doing with his mouth. He kept his fingers weaved through Jack's hair, gripping, pulling on him somewhat. Words were very unnecessary by that point. Actions spoke (screamed) a lot louder than spoken language ever could.
Ianto only looked down again when he felt Jack laugh, and saw that incorrigibly mischievous grin partnered with the teasing promise of what he was going to do next. It was almost worth feeling Jack's lips pull away from him to hear it. But absolutely no complaints from Ianto when he continued, in the midst of desire incited by that maddening man.
This time he couldn't refrain from flushing his hips up slightly, his eyes closed half-mast in reaction to the sensations that kept on swarming his spine. Jack's lavishing attention was causing muscles within him begin to tremble in an all too familiar way. A way which had Ianto closing his eyes completely with determination as he bit down on the inside of his bottom lip. He would not come so soon. No. But, god, if only Jack hadn't been so bloody good at this.
Tightening his fingers where they held his hair, Ianto wanted Jack's lips on him, he wanted Jack's teeth on him, he wanted Jack's hands on him, he wanted Jack on him. Needing more to hold, he conveyed all this by wrapping his hand further around his lover's nape and tugging at it. "Get up here," he breathed, a barely contained moan in his voice, "please."