While Cassandra swam around the reef,a white flash of light suddenly blinded her temporarily.
She rubbed her eyes.After a moment,she could see again though she noticed that her vision had improved underwater.She wasn't sure what to make of it,so she went out of the water back to her camp and went to sleep.
That night,she had weird dreams of her and the mermaid making out.She also saw herself with webbed hands and fins instead of normal feet.
She woke up quite early.The sun just went up on the horizon.
"That mermaid makes me have weird dreams...it sure is just the confusion about the kiss from her...",she mumbled to herself.All that thing about having fantasys with a mermaid and herself being changed...now,it was weird for her,but she didn't know that all of that would play a role later.
She was still nude because she stripped herself of her clothing when she went swimming last evening.As she tried to put her clothes back on,she noticed how tight her bra was.Now she noticed that her breasts were larger than the other day,surely being D-size now.
"What the...?Why the sudden growth?Well,nevermind.I don't need clothing on a deserted island.That way,i don't have to strip everytime i go swimming!",she said cheerful.
She then looked at the ocean...it would be sure nice to take a morning swim,she thought and dashed into the water.
This time,the water felt even better on her skin.It caressed her even more than last evening.She joyfully decided were to swim to now.While swimming,she noticed that her nipples had hardened.She was aroused.
"Well...i kinda hadn't let myself feel good for a long time..."
She swam back to the beach.As she laid herself on the sand,she started to caress herself.She played with her erected nipples,plunged her fingers into her vagina and statisfied her need of masturbation.
As she had her orgasm,more changes began...
Her feet transformed into long fins,her hands became webbed and her ears took on a fin-look.
"What the...?!",she thought to herself."Am i..."
She got interrupted in her thinking when suddenly a sharp pain erupted from her sides.She looked and saw that her skin developed three slits on each side of her body.
"Those must be gills!I'm turning into some fish-human hybrid!"
She started to panic,but then she remembered the mermaid.
"Maybe I'm turning into a mermaid.That mermaid i met early...she must have applied some kind of magic or something.It seemed to have started when i went swimming earlier."
She looked at her feet,which were now fins...then at her webbed hands and gills.Then,she looked at the sea in front of her.She suddenly wanted to dive into the water,let the land of humans behind her,evolve into something else.It was like a primeval urge she couldn't resist.And she didn't want to fight it.
She pulled herself hastly into the sea.The water felt like it was hugging her sexually,caressing her skin and arousing her like nothing else she ever felt.She moaned as her gills started working,sending waves of pleasure through her body as she breathed trough them.
After she got quite a distance between her and the island,she started to masturbate,intiating the final transformation:Her tailbone started to grew into a fishtail,giving herself multiple orgams.
Her legs grew shorter,till there were fully absorbed into her new tail,leaving only the two fins on her hips.On the tip of her tail fins sprouted.She had transformed into a mermaid!