Freyja found herself far more offended at the suggestion that Freyr was boring, than his mention of their activities together. As she watched him, she considered whether she should offer the spirit a chance to depart before things turned to violence. If it took the offer, then she would avoid hurting her brother's body... but doing that would mean no punishment would be forthcoming for the spirit's crimes. It was, however, quite possible that the thing possessing Freyr would feel nothing, and she would only be hurting her brother.
"I'm going to give the opportunity to walk away right now," Freyja said. "If you know his mind as well as you think, then you know that I am formidable. This offer will not be made a second time."