While the Sun Shines by Kit Oliver

Best friends forever means forever, right?
Joined at the hip since high school, Drew and Penny live together, hang out together—and now, commiserate together about their other roommates falling in love. With their foursome suddenly shrunk to two, Drew has to double down on his one rule: never ever let Penny find out he wants more than friendship.
Keeping his secret is easy enough with his focus on his family farm, but when a handsome stranger visits, Drew learns he isn’t Penny’s only childhood friend—and that they might not be as close as he thought. As Drew juggles summer on the farm and his hidden feelings for Penny, he’s faced with not just missing any shot he has at romance but losing her friendship too.