Ianto was fairly certain that Jack's ways of making up for it didn't actually aid in any productivity. In fact, they got less work done when ever Jack decided to help in those other ways. Not that Ianto was complaining. No, definitely not. But it was always awkward, answering a call from the PM's office while one's boss was bending one over a desk. Not that this had ever happened, of course. If there was no CCTV footage, it never happened.
It had happened more that once since Jack had moved in just after Christmas. He would kick Jack out to the couch during some fight, and would end up dragging him back to bed or just joining him on the sofa. He didn't really consider it being weak-willed, just a sign that he cared too much about Jack to let little annoyances bother him for very long. And he liked to think that it went both ways. Jack certainly seemed to be just as incapable of resisting him...and he was just as likely to take advantage of that fact as Jack was. It was a good system and it worked for them.
It really was highly unlikely that Ianto would regain any control at this point. To put it simply, Jack was too damn good at what he was doing for anyone to last long against him. He would argue that his archives were most certainly not dusty, thank you very much, if his brain was still functioning to any degree. But that time had passed around the time Jack got on his knees. There was something about Jack going down on him that just had the ability to make his brain turn to utter mush. The older man had a positively wicked mouth and he knew how to use it. Ianto loved Jack giving head almost as much as Jack loved giving it. Something about knowing Jack was enjoying himself made it that much better.
Ianto shuddered slightly as he could feel the vibrations along his cock, both hands gripping the desk to hold himself upright now. And it was a good thing he was holding on, because his legs nearly gave out as Jack stopped holding back and teasing and finally got to work for real. His eyes rolled back slightly behind his lids with pleasure at the Jack's mouth and the feel of Jack's teeth, just the right side of painful, and he swore in a broken mixture of Welsh and English. Jack was too good at what he did and Ianto knew that if his lover didn't stop soon, he'd come completely undone.