After an unexpected breakup, Rosie Dawson jumps into bed with her favorite friend-with-benefits: her best friend's younger brother, Callum. Rosie isn't looking for anything more than a distraction, so why does she keep finding her thoughts drifting back to him weeks later? Callum Costello has never had any interest in a serious relationship, that is until Rosie shows up at his doorstep. As his sister's best friend, anything more than a hookup with Rosie is off limits. Given his history as the playboy, that should be fine. The only problem? For the first time in his life, Callum finds himself wanting more. With Elena's, Rosie's best friend and Callum's sister's wedding quickly approaching, Callum and Rosie suddenly find themselves forced together more often than they have been in the last decade. She's the Maid of Honor, he's the Best Man, love is in the air, but absolutely no one has feelings for each other...What could possibly go wrong?