The Warrior and the Monk by Layla Moran

Wilder’s life at the monastery is quiet and predictable until a fleet of longships arrives, carrying warriors from a distant land. To avoid bloodshed, one of the monks barters Wilder to a silent, enigmatic warrior named Anders in exchange for little more than a battered sword and the fragile promise of peace. With no say in the matter, Wilder is taken aboard the warriors’ ships, bound for an unknown land he’s never even imagined.
Believing he has been claimed as a servant, Wilder resigns himself to his fate. What he doesn’t realize is that, in Anders’s mind, this exchange has made Wilder his husband.

The Warrior and The Monk is a m/m romance in a viking-esque setting. It features a large size difference between the main character and the love interest, plenty of miscommunication, a curious chicken, and lots of domestic bliss. This is a low stakes fantasy novel with a happy ending.