Asriel, you're my best friend. You belong to me.

"Mom won't like this."
"I'm not really your sister."
"I know, but-"
Chara put her hand over Asriel's mouth. "Let's not tell her then. I know you like being dominated. You've never been in control since I came, so why start now?"
Asriel looked surprised, and then Chara felt his smile under her hand. "Okay..."