Speaking of Daniel Jackson, I just came across this absolutely mind-blowing epic gen(ish) AU/quantum mirror SG-1 novel called A Mirror For Observers. And it just destroyed my Sunday.
The basic premise is that mysterious aliens swap "our" Daniel Jackson for Danielle Jackson, from another reality, and then she has to help get him back. It goes way beyond that, into all sorts of alternate reality/time travel things, and does a fantastic job of re-imagining the plot of SG-1 seasons 5 through 9.
There's romance and sex in it, although it's sort of spoilery to say what they are. Just that it's all a bit unexpected and yet creatively done.
I enjoyed the hell out of it, and thought it was marvelous. Highly recommended.
(BTW, this is the same writer who wrote that kickass House/SG-1 crossover with Daniel/House sex a few months back.)