Author's Note: Thanks for your patience regarding Part 2. I promise Part 3 will arrive sooner than this.
Thanks to Lyse for editing this story.
Part II: Exploring
Sylvia began to move around. She wasn't entirely sure where she was, only that she was underwater in Colwyn Llyn. That much was certain. It was also clear that she could now breathe underwater, a thing that humans can't typically do without some mechanical assistance. That she found fascinating. But she was surprised that this was the only thing about her that seemed to change. Everything else about her seemed...normal, with some exceptions. This worried her to some degree. After all, it's only been a few minutes since she had woken to find herself about 15 meters underwater wearing nothing but a belt of jewels that weren't there before, with 5 or so more meters below her.
Her lack of experience in the water showed at this moment, for in fact her body had changed a lot. When she was "processed," her body's physiology transformed internally to adapt to underwater life. Obviously, that included breathing, but she was also able to open her eyes underwater, and her body adjusted to pressure and buoyancy seamlessly. She didn't need to move around as much to stay where she was. This carried...interesting side effects as well. One which Sylvia felt already: a near-constant state of semi-arousal. She could feel the heat just simmering in her body, waiting for her to act on it, but not in a way that was overwhelming.
That Sylvia felt so aroused despite orgasming what seemed like moments ago was unusual. She hadn't felt that since the last time she had a sex bender. Slowly, it dawned on her why the village women were so intent on her going for a swim: She was like them. Sex-driven, lusty, playful. They too took a fun little swim into Colwyn Llyn, and ended up like this. Which only means there's more pleasure to be had.
Sylvia touched herself. The sparks that bounced around her body made her quiver and spin around in the spot of water she floated. It was both intoxicating and liberating, being naked and exposed in the open water and masturbating with no care in the world. It certainly helped that the water and her body's changes put her in a near-instant state of ecstasy. The way the hot water pressed against her clit and pussy only engorged them further. Her fingers, despite the water, could feel the wetness pouring out of her. She was extremely sensitive, with each touch making her quiver and wiggle.
The benefit of having near-absolute freedom of position and movement meant she had zero restraint on how she moved her limbs around. It helped that she felt more limber and flexible. She took advantage of these facts by shoving some fingers into her asshole alongside her ravishing of her pussy. Her hair billowed about her like cloth in the wind, while her body looped about, moving more because her pre-orgasmic twitches than by any particular motion.
It was barely a minute since Sylvia started, and already she was on the verge of cumming. She made no effort to control herself, to draw it out. No, she wanted to be hit by that orgasm, fast and hard. She knew there would be many more orgasms ahead. To what degree, by what, she didn't know. But the mystery itself is what drove her lust. In the process, as her eyes stared blankly, she sensed a presence, not far from her. She could swear she saw something move in the vague distance. However, she could not find anything as she twisted her body about, facing many directions. Still, she felt those eyes staring at her, watching her embrace her sex.
The thought of being watched drove her over the edge. As the explosion from her pussy spread, she writhed madly, spinning out of control through the water. She let out a yelp, muffled by air bubbles. At a certain point, she withdrew her hands and let herself ride it out without so much as touching herself. The orgasm continued, the water causing her pussy to twitch in ecstasy. Never before had she let an orgasm where there wasn't some form of physical contact involved occur. And it felt amazing.
A couple moments would pass before Sylvia recovered. Just as quickly, she was ready for another round of that. But she realized she would spend all day here doing that if she did. There was much to explore, and other ways to feed off her lust. As she began swimming, she also had an unanswered question: What were these jewels wrapped around her waist? When she came to post-processing, they were there. Someone put them on her, and it was certainly not the creature that processed her.
Speaking of which, she would find said creature on the seafloor not far from where she awoke, inert. She looked at it with some yearning, but she recognized that she wouldn't have another go with it, at least for now. It was a tool, after all. An organic tool with limited intelligence and the ability to enter her mind, but a tool nevertheless. Sylvia was interested in who put that there, and whether they gave her the jewels. There was something interesting afoot under the waves of Colwyn Llyn.
Sylvia began to dive towards the ocean's bed, swimming in a particular direction for reasons she could not explain.. She tried different methods: Front stroke, doggy paddle, some misguided attempt at breaststroke, and an attempt at moving like a mermaid. She was in no rush though, despite having an innate awareness that the effects in her body weren't permanent.
The water's embrace of her body put her at an ease she rarely felt, even when she was on the prowl. Despite being in an unusual place, there was a serenity in her that drowned out even the slightest bit of worry. Even now, she could feel someone's eyes on her, watching, following where she went. Under normal circumstances, she would pay them some mind, making sure they weren't too much trouble. But even that seemed to be too much effort now. The ocean felt calm, and thus did she.
At first, upon reaching the ocean floor, there were only rocks and sand. If Sylvia really wanted, she could just stand still and look for whoever was following her. However, she seemed to care increasingly less about it. Continuing onward, life began to emerge from the ground. First there were small creatures that resembled crabs, flowering weeds, and some other plant life scattered about. Then she saw a reef develop, mixing coral-like creatures with groups of fish swimming about, streaking across the sands. After a while, she saw vine-like apparatuses grow out of the silt, some combining into something resembling a tree. There were even coral-kelp mixtures that were a sight to behold. Before Sylvia knew it, she was in the middle of a space resembling a kelp forest, but far denser and lusher. The kelp looked like trees here. It was an underwater forest in all but name.