It only took a few seconds before Perci felt the tingling of transformation. She shivered, clutching her crotch as she felt something long and smooth slithering out of her vagina. Whatever it was, it felt weird... but also good.
As the tingling subsided, Eva helped Perci pull the polka dot bottoms down to her knees. Almost immediately, something grey, squishy and hard flopped out, hitting Eva in the face.
Eva gasped. "My God... Look at you Perci!" Lo and behold, dangling between Perci's shapely legs, about halfway to her knees, was a... shark penis? A small fin protruded from the grey top half of the penis, and the underside of the penis was white. It bore an uncanny resemblance to the underbelly of a great white shark.
Perci was astonished. "I can't believe it... I have a shark penis! Or... I guess, a penis that looks like a shark? What the heck!? " She swung her girly hips from side to side, making her new oceanic endowment wriggle like a fish out of water. The polka dot swimming bottoms slipped down her legs, falling to the floor.
Eva reached down and picked up the bottoms. "These are amazing! Gee, I wonder what would happen if other people wore them..." At this thought, Eva's own dolphin cock began to harden. Its sleek, blue curved look was in definite contrast to Perci's much fiercer looking new addition. It was also slightly smaller... not that size mattered to her, of course.
Perci's eyes lit up. "We have to show the others our new penises!" Perci's large shark member suddenly stiffened, perking up at the thought of going out to the pool. "Also, for some reason I have a craving to get into the water... do you feel that too?"
Eva blushed as she observed Perci's sudden arousal. "Good idea... I kinda want to swim too... Let's go!"
Grabbing Perci with one hand, and the magical swimming bottoms with the other, Eva raced out of the locker room. Not caring to cover their junk, both girls' nude nautical penises jiggled as they ran.
Arriving at the poolside in a fit of giggles, Eva and Perci each dove into the pool headfirst. As they began to tread the water, they immediately realized their swimming ability had improved.
"This feels sooo amazing!" Eva laughed as she spun around in circles, enjoying the feeling of cool water currents caressing her dolphin member. Perci continued to tread the water, and flashed a toothy grin at Eva. In some strange way, this made her look like a shark - albeit a flirty, rather feminine-looking one.
The coach and other girls stood watching by the poolside, stunned. Diane's stomach turned as she realized she knew the source of this chaos. Those polkadot swimming bottoms that Eva was holding belonged to her. She had recently lost them, before she even had a chance to try them on.
Perci, still grinning, called out to them. "Come on girls, jump in!! What are you waiting for?"