Drive Me Crazy by Rebecca Jenshak

Cam girl, Naomi, doesn’t care what anyone thinks of her career choice. After losing her parents and older brother, she’ll do whatever it takes to support herself. She does, however, want to show her brother’s best friend that she’s all grown up.

Grady promised to look after his late best friend’s little sister. The problem – she’s not so little anymore. While he tries to convince Naomi that she needs to find a real job, she strikes a deal. If he watches her work for a few nights and still disapproves, then she’ll quit.
But one night with Princess Peach, Naomi’s alter ego, and Grady knows he’s in trouble.