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

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 these girls have 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 none of them have heard the unsavory rumors surrounding the local lord of the town where they stay the night on their return trip...