Tied In Tentacles by Megs Pritchard

Justin wanted peace, not drama. A quiet Christmas alone in a mountain cabin was supposed to help him recover from a brutal breakup. The last thing he expected was a neighbor who made his pulse race—and who’s hiding more than he lets on.
Eteriion has been stranded on Earth for years, keeping to himself and hiding the truth about what he is. Loneliness has become normal, until Justin arrives and changes everything.
The attraction between them is instant and intense. But Justin doesn’t know the man next door is an alien, and Eteriion isn’t sure if revealing the truth will bring them closer—or drive Justin away for good.

Snow. Secrets. Desire. This Christmas, love might be the most dangerous risk of all.