Unwrapping Ember by KM Rogness

After a secluded and lonely upbringing, Ember finally gets the chance to experience the freedom of the outside world when she goes off to college. Yet, she is immediately disappointed to find that the life she had always dreamt of falls short of her expectations.
When a brutal attack leaves her isolated, spiraling, and forced into silence through blackmail, Ember turns to the one person she has always felt secure with—her overly-protective, older stepbrother, Koda, who disappeared from her life years ago without a trace or explanation.
A random blizzard disrupts her Christmas plans, leaving Ember unexpectedly snowed in with Koda and his roommates, struggling with forbidden temptations and a dark secret she battles to conceal.
However, she isn’t the only one with a secret.
Koda had always held a soft spot for Ember and grappled with the concept of right and wrong all his life.
After one night of mistakes, lies, and the ultimate betrayal, Koda vanishes from Ember’s life, fearing he would let her down and pull her into the darkness that consumed him.
He believed he had moved on from the forbidden feelings he struggled with growing up, but when Ember shows up on his doorstep in the dead of night, he realizes those feelings never truly disappeared. Now that she is back in his grasp, he’s determined to see where they might lead.
As the truth about Ember’s secret, as well as Koda’s, unfolds, their eyes are suddenly opened to each other’s true desires, and before they know it, both of them come to realize that their once buried feelings never truly vanished.

This is a why choose stepsibling dark romance with dark and triggering themes. Be sure to read the content warnings at the beginning of the book.