Fight or Flight by Samantha Young
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Then over the course of their journey home, their antagonism somehow lands them in bed for the steamiest layover Ava's ever had. And that's all it is - jet-lag induced insanity - until Caleb, AKA Mr Arrogant Himself, shows up on her doorstep. Pure chance has landed Caleb in Boston, but he's determined to enjoy himself - and Ava - while he's there.
Ava gives in because a) her heart is safe since she barely likes Caleb, b) his existence in her life is temporary and c) it's by a mile high club the best sex of her life. When his stay in Boston becomes permanent, Ava must decide whether to fight her feelings for him or give into them. And even if she does decide to risk her heart on Caleb, there is no guarantee her stubborn Scot will want to risk his heart on her.