Broken Fang had somehow turned into one of their local hangouts. Both because of the privacy from the media and none of the Vampire King's men were stationed at the club. It was actually one of ONYX's competitors and the Duke who owned the bar was one of the King's more responsible subjects.
Unlike other establishments, it could be run without any of the King's spies. That made it the perfect location for two royals who needed to relieve themselves of stress without the watchful eyes of everyone. Here in Broken Fang, only a few knew who they were—or, more precisely, who Rhea was.
They steered clear of Rhea, not wishing to get involved with the ruthless King's precious daughter, and she did the same in return. It was a win-win situation.