Heat Factor: Explicit M/M action. Where one of the characters is an alien with erogenous prehensile hair. I would call it hentai adjacent. (Mom, please do NOT Google hentai.) (Note: After writing this, I Googled hentai, and according to Wikipedia, I am using the term incorrectly. What I mean is: Tentacles.)
Character Chemistry: Sudden.
Plot: Alien and Space Station Detective bone and also solve a mystery.
Heat Factor: It’s not a crackling fire, it’s a warm glow
Character Chemistry: They start off as mismatched, secretly-attracted friends that grow into something more very slowly.
Plot: The plot here really is the romance and only the romance. Jude and Iris fall in love very beautifully, but if you’re looking for outside forces or exciting context, that isn’t part of this love story.
Overall: This is a very lovely book and I enjoyed it a great deal (even if I longed for more).