My Dearest Stepbrothers: Fun in the Sun 2 (A Forbidden Billionaire Menage Romance)
Claire Sutcliffe

When Celia's mother decided to marry Brandon and Bryson's father, she figured that things would be different. But her twin stepbrothers welcomed her into their circle, forming a bond that she thought would last forever. Until it didn't. Once they started high school, the teasing and the tormenting began, though Celia could never figure out why.
So when she was told that the whole family would be gathering so mom and stepdad could renew their vows, Celia was less than thrilled. In fact, she vowed to make sure that the twins won't be able to find fault with anything about her. She succeeded far better than anything she could have imagined...