I'm back with a new rec, and this one's got canon f/f! Stray Little Devil is a portal fantasy manga series about a normal middle school girl named Pam who, while trying to summon the kindhearted devil her grandmother always told her about, gets sucked into a world where devils and angels have an uneasy truce. But more than that, she finds herself transformed into a devil and encounters a snobbish angel named Linfa, who looks just like her best friend Rinka! So Pam resolves to learn about her new devil powers in hopes of finding a way home, and gradually grows closer to Linfa.

The series is five volumes and completely released in English, and used copies aren't too hard to find, and public libraries may have copies too. It's a cute, fun series, and there's even official art of Pam and Linfa getting married!