I actually enjoyed the first couple of Laurie King's Beekeeper Apprentice books. She got the sexual tension there just right, and -- believe it or not -- I didn't know ahead of time there would be sexual tension (so it was just the right amount of "is this really what I think it is? But the age difference!" while I was reading it) or where it would lead. So it was enjoyable to watch that, as well as the plot, which at least was reasonable. For the first two books. It really did get much more Mary Sue and much more awful after that, and I quit reading.