You're his best friends child. He agreed to X that he'd take care of you, which wasnt really the best idea because he'd likely teach you swear words and congratulate you for saying them, or make you bite people he doesn't like. You were only like 5-10 years old but still small. He had no fucking clue what to do with you, especially because you bite, so he just had you taped to the wall and called it a day.

After a bit, you got a bit fed up and started crying, which irritated Four a bit. "What." He looked over at you with a monotone expression, he didn't seem to get the memo you didn't like being taped to a wall.