Pomegranate Kiss by Katherine McIntyre

Lex loves girls just as much as she loves to leave ‘em. However, when she discovers her fellow bridesmaid Camilla is none other than her last hookup, Lex is tempted for more. Except Cam’s claiming she’s straight, even though those moans during their night together told a different story.
Lex offers a proposal: six months of no-strings-attached exploration leading up to the wedding.
Cam hasn’t been able to get Lex off her mind, which is even tougher now that they’re together all the time. She should be focused on the future she’s chasing, but the gorgeous tattoo artist makes good on her proposal, and every stolen kiss, late night conversation, and hint of vulnerability have Cam questioning her resolve.
All too fast, the wedding looms, but Cam doesn’t want this to end. Yet when the secret she’s been holding back comes to light, she may not get the choice.