Bellatrix did approve of the idea, so much that she forgot what retort she had about Rodolphus. "Oh, that sounds brilliant, Cissa! I could help you with the party too, you know. If you wanted my help, that is." She decided to be nice this time and give her sister a choice in the matter, rather than forcing her way into it.
"Things must be getting serious, then, if he is inviting you there for the holiday. And to think, however long this has been going on, and you didn't breathe a word about it to me. Now I'm hurt," she said, pouting.