The bet

"When Kacey accepts Jake's proposal, she soon realizes her life is not going to be better. However, there is a knight in shining armor for Kacey and that man may just be Jake's older brother Travis."@en
"But Kacey wasn't counting on Jake's older brother Travis still being there. She calls him "Satan" for a reason: she's never forgotten the way he teased and taunted her. Yet when they meet again, Travis's gorgeous smile is a direct hit to her heart and Kacey's more confused than ever. As the days pass, only one thing starts to become alarmingly clear-she never should have accepted Jake's deal."
"Kacey makes a deal with Jake Titus in hopes of putting her past behind her, but doesn't count on Jake's older brother Travis being present to witness their farce of an engagement."@en
"Kacey agrees to pretend to be childhood friend Jake's fiancée for his dying grandmother, but as she reconnects with Jake's family, she encounters Jake's brother Travis, who used to torment her as a child, but is now irresistibly alluring."