Once Is Never Enough by Mira Lyn Kelly

Garrett Carter doesn’t date his little sister’s friends. At least not when he knows who they are…
Nichole Daniels is sick of heartbreak and done dating the wrong guys. But when a sexy stranger tempts her with a single night of no-strings fun, she decides to break her own rules, once.
It seems like the perfect exception… until she wakes up beside her bestie’s over-protective big brother, a man with a reputation for being everything Nichole doesn’t want.