Yes! Of course. And it would be fun to set it up like he's going to take our Jack's place while he figures out what's going on and it will be this whole suspenseful thing about whether the others will figure it out in time, except then Ianto comes back from picking up lunch and susses him out in five seconds.

This needs so badly to be written.

Then write it! I'll even start you off.

Jack cracked his head hard against the floor as he landed. He blinked at the ceiling a few times, dazed, before he sat, bracing himself against the rush of vertigo -

And found himself face to face with Owen and Tosh.

For a few floundering seconds he thought he'd somehow managed to die after all and everyone had gotten it wrong about the darkness. Then Tosh went for her gun and Owen started shouting into his head set and Jack knew that something much stranger was going on.

And GO!

I'm sure that not hinting at all won't scare people that badly

Maybe not. I just have a horrible prejudice against OC pairings in fic, and ninety-nine percent of the time I am right.

And there is another difficulty - namely, that this is Owen we are talking about. Either I spend valuable time delving into his myriad issues about commitment and abandonment (boring myself to tears and revealing that I can't write romance to save my life in the process) or I come up with a reason why they have conveniently fallen by the wayside. And I work it in carefully to give an ominous feeling to the proceedings, because if I don't, it's going to look like I've just written Owen OOC. And the last thing on the planet I ever want to be accused of in my fic is bad characterization. That's an even worse crime than an overly perfect OC self-insert.

I think I've worked it out, though. It's all shaping itself a bit more clearly.