Serena looked at them then said "I think it happened a few nights ago...I was in a fight with a demon that used these nasty bug things....I was able to banish him but I must have been bitten during the fight..." She flinched and lowered her head again. "And...he can't know what I am...because he might have to kill me...to keep the balance..." 

Serena looked at Kay and said "I'm kinda like you, Kay...I have a hidden power that is hunted...but mine is not as beautiful as yours..." She raised her hand and shadows gathered around her hand, a shape appearing behind her, the shape of a wolf. "I am blessed by the Shadow of the moon...a beast spirit that controls shadows and the night..." She looked at Chas and said "He was the right hand to the Goddess Nyx...and I am his vessel..." 

John was pacing upstairs now, reading and muttering to himself.