A TGE passenger gave me a heads up about an erotic f/f sci-fi romance called DARK HORIZONS (February 2014, Desert Palm Press) by Rae D. Magnon and Michelle Magly. Check out this awesome cover:
I read the opening pages and the story jumps right into a military battle on an alien planet. Then I did a little bit of research and it looks like the story switches focus to the couple and their sexual journey. The setting is military SF and fans of the videogame MASS EFFECT may also find this book appealing.
I'm looking forward to reading it because that cover!!