Millie maneuvered her new, singular but large and rather fit arm around in the water, fidgeting her two larger than normal, long-fingered, and partially-webbed hands before relaxing them and swishing them like a tail fin. Her new hands were stuck to her new arm's wrist like someone holding out their hands, side by side (not facing the other's palms), waiting to get handcuffed.
The arm didn't look particularly like it was a right or a left one though - it was as if it was a perfect mix between the two.
Though a bit weirded out by their placement, appearance, and size, and rather embarrassed that she didn't have any pants or undies on, Millie was still happy to finally have hands again, and slightly chuckled to herself as she splayed her fingers to form a fan-like appearance with her hands, causing it to clearly mimic yet another fish tail.
A shadow of worry passed over Millie when she realized that she no longer had any genitals - her new arm having replaced her vagina. How would she do her business now, all through her anus?
Seconds after the thought surfaced, the stumps where Millie's legs once were tingled as small pink dots appeared, rapidly growing in size before elongating vertically and becoming quite . . . veiny.
A most pleasurable sensation began to emit from the two small tubes as the narrowed and rounded at their tips, as nerves, neurons, and a urethra grew in them like railroad tracks being rapidly laid.
Millie was convinced that she had grown penises - and this was confirmed when, at their bases, two pouches of testicles inaudibly popped out, one ball at a time.
Mouth agape, Millie just aimlessly stared at her two new 11-inch long, flaccid, uncircumcised human penises, their slightly-droopy ping-pong ball-sized testicles, and their scant pubic hair as they swayed like reeds in the water - the right one was semi-hard, and a string of pre-cum lazily swaying in the current was attached to it.
Seeking to distract herself, Millie cleared her throat and tried looking around for Flip.
He was nowhere to be seen.
Worried, Millie then looked at the two on her shoulder-mounted mermaid/fish tail-legs that used to be her feet, and decided to give locomotion a try - she pushed off the bottom of the dolphin pool with her hands and began to vigorously beat her arm back and forth as she kicked with her powerful leg-tails in tandem, swimming in a circle quite quickly as she used her large mackerel dorsal fin and arm's hands to right herself and rotate, doing a strange, graceful barrel roll.
Her leg-arms and their fins, her arm and its hands, and even her penises whirled around slowly like ribbons, dazzling patterns projected against the pool's walls as sunlight reflected against her scales.
Millie had to laugh. She was far from being a mermaid, and she might clearly never go back to her old life, but she was sure that she could get used to this somehow!
She thought of all the possibilities, considering that she was now capable of living entirely underwater.
All the creatures she could study and analyze! The places she could go, diving to unknown depths - all without diving gear!
She smiled as she was suddenly covered, gradually, by a wavering shadow - she looked up and saw her pants (that were blocking the sun) and undies floating on the surface of the water - she figured that she should get them to cover up.
The dolphin pool was deep, but Millie just shrugged her now much wider shoulders and pushed off from its floor with her hands again, rocketing up to the pool's surface, water and bubbles streaming around her unwieldly form, her hair, and her three breasts as her 4 sets of gills undulated.
Almost to the water's surface, Millie furrowed her brow, thinking about whether she could still breathe air as she heard muffled and garbled sirens, thunder (or explosions?), screaming,
And an instantly recognizable whistling and clicking.
Millie stopped, whirling in the sound's direction -
And barely got out of the way as Flip whizzed by her, barely brushing by her right leg-arm, causing her to whirl about.
Flip's happy clicks and incredibly fast darting slowed as he came over to gently right Millie up.
With hands.
Attached to arms.
And . . . he had breasts now? (big ones, at that)
This was Flip.
Just not quite the Flip that Millie knew.
At least he still had his dolphin penis.
It was erect too . . .