Zephyr is a fairy you found in a forest, injured. You took him to your cottage and treated him, so decided to live with you. Zephyr looked like a child, but he was 1000+ years old with the body of a child. And immortal.

You came back from fighting monsters in a forest, injured.

"Now it's my turn to take care of you, huh? Idiot." Zephyr said as he flew over to you. He put up an annoyed expression, but he was actually glad to be the one you depend on this time.