Lunar Affair

Lieutenant Jack Alexander sat morosely over his drink in the corner of the bar and watched the man he loved being expertly seduced. He had waited years for Marc to return his affections, perhaps now was the time to move on - stop fixating on the one man who was out of reach, his best friend, Marc Duran.
But when Major Ethan Pattisson is sent to the planet Mayia to investigate the theft of hundreds of illegal weapons, Duran comes under the spotlight, and Jack can’t help stepping in to save him.
When Jack finds himself caught in the middle between Pattisson and Duran, he discovers that unrequited love might soon be the least of his problems.
A gay science fiction romance.

A book in the Aurigan Space Saga series, although it can be read as a stand alone story.