"...how on earth he’d put up with Jack let alone get to the point of having sex with him if irritation wasn’t an obscure personal aphrodisiac is beyond him."

Nothing has summarized their relationship any more succinctly than that statement. Wingfic is not a genre I've cared much for, but this one was outstanding for its humor, eroticism, and grasp of their characters. Poor put-upon Ianto, the victim of unsympathetic puns from teammates and Jack's mindless rutting (which he actually loves).
And their underlying affection comes through clearly, which I love. Thanks for writing!