The basic idea would be to follow the Hermpire story tread from the BE Addventure along the perspective of a different group of ‘survivors’ in an office building following them as they try to leave building and then the city while avoiding groups of now feral hybrids both inside the building as well as the city streets. Like in the story threads those ‘taken’ by a feral rapidly transform into the same breed while those exposed to reproductive fluids may transform far more slowly without even realizing they are infected until it is almost too late for those around them.