Claimings, Tails, and Other Alien Artifacts - Lyn Gala Yay, this had everything I'm looking for in a captured/slave-fic and sci-fi setting. It was fun, a good length, and I enjoyed the dynamics in their relationship!
Definitely checking out her other works.
:D

*** 8/4/13: Re-read! Stil remains my second favorite mm sci-fi.