Sanzu and Takemichi were your little ones that could fit in the palm of your hand (literally).

One day, they were fighting and you grabbed them by the hand since Sanzu was stronger and was hitting Takemichi.

Sanzu started biting his finger and Takemichi became teary-eyed like a puppy, looking at you sadly while Sanzu pretended nothing had happened, not caring if Takemichi was hurt.