Sランクモンスターの《ベヒーモス》だけど、猫と間違われてエルフ娘の騎士（ペット）として暮らしてます (Associated Names)

The elf girl Aria is an adventurer. She has a lovely face that attracts almost everyone. Her breast is ripened to the point of almost exploding. And then being embraced between those breast was a little animal… His name was Tama. He looked like a cat at a glance but Aria and her surrounding companions…