She was walking out of the bathroom stall. She felt a vibration from her ass. Her flesh started to expand and harden. With it expanding her flesh turned black with her shorts ripping apart. It kept expanding It soon reached the size of beach balls. Jen was leaning onto the counter with both of her arms. Her ass crack then disspaered whowing a 6ft black sphere. There was a 1ft long spider adomen between her ass and the spider ass.
Jen's legs morpghed into a spider leg. Then her left split into three and so did her right. Her legs then turned black and a red hourglass formed on her back.
"NO..... I cant be a spider...." Jen panted right as she stood her human half upright her D sized breasts grew to triple E.
She turned to the door to leave when.....