Winter of the Owl by Iris Foxglove

Sava has the best house in all of Lukos. He built it himself, dreaming of the day when he and Milan, the man he loved, could live there and brave the harsh winters of Lukos together—only to be devastated when Milan was found dead in the spring. Fraught with grief, Sava resigns himself to spending his winters alone.

Then a stranger appears on his doorstep, and everything changes.

Victor is a scholar from Gerakia, a land known for its long summers and vibrant history, and he has never been more
unprepared in his life. Abandoned on the inhospitable island of Lukos after a disastrous relationship, Victor has to adapt quickly to survive. It helps, of course, that he’s taken in by Sava, who has the biggest heart of any man Victor has ever known. Victor and Sava start to make a home together, growing close as snow falls outside, but the true danger of a Lukos winter is closer than they suspect…