Never Say Goodbye (A Dahvie Vanity love story)

Jayy Von Monroe hasn't seen his sister in ten years after there amazing brother sister relationship fell apart when he left. She appears at one of their concerts needing a place to stay. They make her come on the tour with them but Dustine Monroe seem extra flirty with Dahvie Vanity. Does she just have a little crush or is something happening that Jayy doesn't know about?