Not Happy Campers by Ash Keller

This novella was previously published in the Funny Thing About Love box set, but is now expanded and re-released as a standalone romantic comedy in the Road Trip to Love series.
The only thing worse than being stuck in an RV with your enemy? Having to pretend you’re madly in love.
Lance Blakeman is an up-and-coming literary agent with a chance to represent the biggest horror writer since Stephen King. Unfortunately, the client doesn’t want to work with a bachelor. Lance needs a fiancée—fast.
Lainey Fredrickson is a struggling artist making ends meet by waitressing at a local diner. Or, she had been, until pretty boy Lance got her fired for accidentally spilling a beer on him. The way he carried on, you’d think she had deliberately doused him with radioactive waste. Now, she has exactly $4.23 to her name—not enough for an iced latte, let alone rent.
When Lance offers Lainey cash to pose as his fiancée, she can’t afford to say no, even if it means spending a week in a cramped RV with him. But can they fool the client without fooling themselves? There’s a fine line between love and hate. And with kisses this sweet, the line is bound to get blurred.