Chemistry: very high.
Fake dating done properly. Catalina needs a date for her sister's wedding in Spain; Aaron, her tall infuriating colleague who she has never liked, offers to go. Armas understands that fake dating only works if the reader can feel exactly why these two would never admit the obvious, and she delivers that with real skill. The slow burn is genuinely slow — some readers find this frustrating, I find it satisfying when the payoff eventually hits me hard. Chemistry: very high. Pacing: deliberately measured, which suits the trope. Four stars; would have been five if she'd cut thirty pages from the middle.