Dirty Little Secret by Ditter Kellen

Danielle Gables has secretly been in love with her stepbrother since the tender age of fifteen…until he storms from the house one night in a rage, leaving a heartbroken Danni behind in his wake.
Jonah Martin has returned to Florida to attend his stepsister’s graduation ceremony, only to find her all grown up and in a relationship with a mutual friend. It’s been six years since Jonah’s seen Danni’s beautiful face. He’s not prepared for the emotional ride she’s about to take him on.