BoyFrenemy: Enemies to Lovers, Step-Brother Romance

Hunter and Ivory have known each other since they were children. They were best friends, then worst enemies.
After their parents' surprise elopement, they're suddenly roommates, but even worse,

Siblings.

Funny how, somehow, it changed nothing, and everything.
After 'The Big Mistake', Ivory thought she was finally over Hunter and able to put it all behind her.

Psych!

With the love of her life, and her ex-best friend thrown back into her world, she realizes that not only is she so not over him, but she loves him more than ever.
If only he could pull his head out long enough to see it.
Eh, a girl could hope.