I hear siblings can be like that though. It's each other's duty to look after the other, especially the older ones.

[By which she means, that's the ideas she's grasped from books. And she's completely aware of the twisted Vantas family tree, but from what she heard Karkat was coming to accept his surrogate family so sister seems perfectly acceptable.]

Well I'm not surprised Ms Meyer didn't get extremely upset with that. She doesn't seem like the most relaxed one. Though she's nowhere near as bad as Anne Rice. She has extremely strict rules on all fanworks.