The Unbearable Melt: Book Three in The Laughter of the Sun series by Andie Holman

Allies are elusive, and gods hold grudges in an icy land.
Two romances:
1. M/M. They are ex-lovers, forced to work together with Mage magic in Scotland. The tension is tight. Will they? Won't they? And while we're here, can we have a peek up that kilt?
2. M/F. He's a wolf shifter returning to his estranged home in the Arctic. She comes into her powers while there, and he'll do anything to keep her safe. "Touch her and I'll bite you."

There are different dimensions and multiple players.

To start at the beginning, The award-winning The Mermaid's Wrath is book one, and The Sorrow of Bees is book two. If Pen Pinery allows it, I will put those on here as well so you can swim with mermaid warriors and fly with queen bees.