From New York Times bestselling author Kendall Ryan comes a flirty new standalone about falling for your older brother's best friend.There's pretty much only one rule when you're a guy.Don't be a douche.Turns out, the fastest way to break that rule is to fall for your best friend's sister.Ava's brilliant, sharp-tongued, gorgeous, and five years younger than me.She's the sexual equivalent of running with scissors. In a word, she's dangerous...