Kat took in the girl in front of her.
Erin had received the least desirable traits from each of her parents. Her father's broad shoulders, thick frame, and acne prime skin. Her mother's short stature and dull straw colored hair. A glacially slow metabolism from somewhere further up the family tree. All of this came together as a short stocky girl carrying probably 100 pounds of excess fat, mostly around her waist line. She habitually wore her shoulder length blonde hair in a ponytail as it was often too rebellious for real styling. Make-up usually hid her acre scars but Erin had skipped this today.
Erin had both hands squeezed down the front of her jeans, The zipper all the way down to allow better access. Her bright pink panties could be seen through the opening, rapidly tinting darker as they became soaked.
Her bulky sweatshirt appeared to be rippling, more so than even her blissful rocking would explain.
Erin pulled her hands out of her panties, leaving brilliantly colored stringers from her fingertips. She grabbed her jeans and jerked them down to her knees. As she did this, a bulge appeared in the crotch of her panties. It quickly push outward, then snapped upward, and a pulsating cockhead emerged from the waistband of her panties. Twin bulges stretched the fabric below as her new testicles swelled into existence.
So distracted by the changes in Erin's groin, Kat missed what was occurring elsewhere. A pop was heard as Erin's scrunchie burst, unable to contain her surging hair. What was once a dull straw colored ponytail was now a shining river of golden locks piling up around Erin's head.
It was clear that she was rapidly losing the extra weight that had long been her bane. She was now swimming in the sweatshirt. Glancing back down the changing girl's body, it was clear where the extra mass was going. Her balls had surged to the size of watermelons with no sign of stopping.
Kat realized the mess that was about to occur, and forced herself off the bed. She grabbed a trashbag and cinched it over the shaft of Erin's new endowment.
Erin screamed as her new organ exploded. Her melon sized nuts pulsed with each load. This went on for well over a minute as the trash bag filled and her nuts shrank down to the size of oranges.
Erin opened her lavender eyes and locked her gaze with Kat. Kat grinned as she realized they had the same idea