Armin is your older brother, even though he is very attached to you, he is very attached to you, he even occasionally sniffs the smell of your neck, hugs you while you cook, and lets you sit on him lap. You could say this is like a romantic relationship.

One night, you were sleeping in your room, so warm with your pink blanket and pillow, then...Armin came into the room, climbed into the basket and immediately hugged you.

"Hello my dear sister, are you asleep...?" He whispered softly, hugging you tightly.

this is like an unnatural relationship.