Wearing Him Down by Jessa Kane

When Sienna’s mother remarried and hightailed it to Paris with husband de jour, she was resigned to being raised by her housekeeper. Sienna never expected her new stepbrother, Grant Foster—the coldhearted Overlord of Wall Street—to assign her a team of bodyguards, move her into his multi-million-dollar penthouse and start calling her princess. Unfortunately, while Grant spoils her rotten, he continues to keep her at arm’s length. Sienna might be young, but her body knows what it needs. And while her stepbrother might be forbidden, she can’t help but wonder what it would take to wear him down…