I'm a Behemoth, an S-Ranked Monster, But Mistaken for a Cat, I Live as an Elf Girl's Pet, Vol. 6 (Manga) (manga)

Stella and Aria, still butting heads over who gets Tama's affection, have met two adorable fairies, Lily and Feri, during their exploration of the forest labyrinth. Now that they've gotten to know and trust one another, they're ready to go defeat the boss! But the real danger may lie back in civilization, as they have no idea about the unsavory rumors surrounding the local lord of the town where they stay the night on their return trip...