After a few weeks Jack even came to find the word "NO" faintly arousing. He understood the link between the events, of course - too much flirtation with other people and his psycho-possessive coffee-making employee-he'd-been-fucking wouldn't let him come. At all.

Which he might have viewed as entirely unfair - he was a free agent, after all, Jack Fucking Harkness, intergalactic tart and congenital flirt, no more capable of monogamy than Ianto was of sharing nicely - but he actually kinda looked the look on Ianto's face when, on the brink of letting go, Jack asked, "May I?"

And Ianto said, "No."