Why You Should Never Kiss Your Roommate by Erin Nicholas

A roommates-to-lovers, he-falls-first rom com

Conner Dixon has sworn to never live with another woman after raising his four younger sisters. He’s retiring—from worrying, fixing problems, and cleaning up messes. But when a fellow paramedic’s apartment burns down and she needs a place to stay, he can’t say no.
Gabby’s penchant for poker and her ability to overhaul a transmission definitely make her different from his usual women—not to mention her total lack of interest in getting involved with him. With her sights set on medical school, his crazy mix of family and friends is the last thing she needs right now.
But within forty-eight hours of moving in, she’s up to her eyeballs in a family crisis and he’s in uncharted territory with a girl he wants to rescue…who doesn’t need him at all.

(this book was previously published as Up By Five (Just Everyday Heroes: Night Shift/ the Dixons)