Tour Wars by Carla Luna

Ten days, two rivals, and a busload of tourists. How bad could it be?

For archaeologist Emilia Flores, landing a fellowship to work at the ancient ruins of Pompeii in Italy is a dream come true. The only catch? She’ll be digging alongside her infuriating nemesis, TJ Mayer, who’s been a constant thorn in her side.
TJ isn’t about to pass up the Pompeii project. Sure, he’ll be stuck working with Emilia, but he thrives on challenging her. And he hasn’t forgotten that secret kiss they shared at an archaeology conference last winter.
Though unearthing Pompeii’s treasures might be a dream, student debt is a nightmare that never takes a vacation. So, when TJ and Emilia are offered a lucrative side job to lead a ten-day tour through southern Italy, they grudgingly agree to tackle it together.
Forced to set aside their animosity and work as a team, they forge an unexpected camaraderie. As the sparks between them ignite, their rivalry gives way to passion, making it easy to forget their years of fierce competition. But what happens when the tour ends and the real world steps in?

Tour Wars is a rivals-to-lovers, grumpy/sunshine romance featuring a nerdy cinnamon roll hero, a strong-willed Latina heroine, and plenty of hotel hijinks. It can be read as a standalone.