I am really confused by tree stepmom. Did this story ever establish that there were any extra special benefits to being with a vampire? All I remember is there being some drawbacks...
@icekatze As i understand it, Vivi can only drink a certain type of blood (which Kara has), tree mom is thanking Kara for staying with Vivi (as a source of blood), but asks if she will stay with Vivi for reasons other than just being her blood bag.