Copula (Strange Taxonomy #2) by Joanne Kwan

Sequel to Secunda.

Patience has barely settled into married life with her husband and their inhuman partner when they are invited to spend the holidays up north. Along the way to meeting her new husband's family, the man and the monster begin to navigate their own relationship.

Though a less than warm greeting awaits their arrival, family cynicism is the least of their worries. A camp full of beasts and the land itself threaten to upend their new normal when a hike gone awry divides the trio.

Temptations old and new challenge them as they fight for survival in the northern wilderness. Will Patience be able to save her partners, or will there be nothing left to save?