Stepbrother WHOA! (The Stepbrother Romance Series - Book #5)
Claire Adams

They both cheer each other on at their second meet, and Mia can't remember a time when she has been happier in her entire life; when they both finish first in their respective divisions, Mia and Jaxon find somewhere to celebrate privately--only to be discovered by their parents, who came to surprise them, not knowing that they would get a surprise of their own.
As Jaxon's father berates her in the middle of a restaurant, Mia decides she has had enough of his cruelty and stands up for herself and for Jaxon, telling her step-father that he's not only not good enough for her step-brother, but not good enough for her mother either. Convinced she has destroyed not only her chances at being with Jaxon, but also every vestige of a relationship with her mom, Mia flees. Is the end?