This sci-fi fantasy M/M romance is an interesting read. Helios Dayspring is heir to the throne of Astrum on the planet of Arash, and yet he's also a sex slave. A war broke out between neighboring kingdoms (aided by Helios' estranged wife) and he was taken captive and sold into sexual slavery. He has no memory of his past because he was implanted with a slave chip that suppresses all his memories and controls his mood to keep him compliant. He has spent the past 5 years as a slave on the planet Warlan. 
 One evening his pimp, U'shma, takes him to a dive bar to make some gambling money. Helios catches a glimpse of a man he feels attracted to, and subtly gets his attention. Griffin is a large, formidable man, and he wins Helios's services for a night--what neither of them suspect (because Helios is required to wear the prostitutes mask and long gown) is that Griffin and Helios are both from Arash--and that Griffin was Helios' personal guard (and lover) long before the war began. 
 In the privacy of Griffin's room, however, the truth comes out. And it's a tension-filled race to get Helios back to his people, and get his memories restored. I liked this one. The world-building was interesting, and there were lots of good scenes between Griffin and Helios. 
 One complaint was the dialogue, which was thoroughly contemporary to the USA, and it drew me out of the story. I wanted it to be more majestic, I suppose. Still, it's a fun M/M Sci-fi read. I received a copy of this book via NetGalley.