The pool is closest

Aiden decided that the pool should probably be first. Not only was it the closest, but he also wanted to wash the cum off his chest. Plus, the few occupants of it had already seen him.

Three guys, all with varying shades of brown hair, and two women, a blonde and a redhead, were now in the pool, all of them pretty average in terms of looks and figures. One of the men with longer hair tied back did seem a little flabbier than the others, and the redhead did seem more endowed in the breast department. Aiden watched them as they watched him as he strolled to the edge of the pool and jumped in.

He knew he didn't have time to infect them all individually, so he came up with a different idea. With a thought, he grew another dick next to his first, then wrapped his hands around them both, stroking them quickly. Holding nothing back, he balls grew as a monumental load built within them. He stayed underwater, not really needing air, as his orgasm quickly built. With a yell muffled by the water, his cocks jerked and twitched, filling the water with a huge amount of infected cum, which rapidly dispersed. Aiden immediately came again, filling the pool with the virus even further. It replicated at a ridiculous pace, saturating the entire pool within 30 seconds.

Meanwhile, the other five occupants of the pool looked at each other in confusion. "Who the hell was that? Why was he naked?" one of the men asked. He subtly reached down and adjusted himself inside his swimsuit, strangely aroused. The redhead seemed to have the same problem, shifting her one-piece suit over her suddenly sensitive breasts.

"I don't know," the blonde said, looking towards where Aiden was still submerged. "He hasn't come up back up yet, do you think he's okay?"

"I'm sure he's fine," another man said, his eyes fixated on the blonde's bikini clad ass underneath the water, his speedo straining at the groin.

"Yeah, you're right...." the thicker man said with a slight groan, his eyes losing focus for a moment as his dick twitched and spurted in his suit, one of his hands snaking under his swim shorts to jerk it. The redhead turned around at the strange sound, her eyes going wide as arousal shot through her body at the sight of her friend cumming in the pool.

"Tyler, wh-what the hell?" she asked, her nipples rock hard and visibly poking out of her suit.

"Oh shit, Ivy, you've got no idea how good that was. But I'm still so fucking hard. You want to help me out?" the man asked, laying back in the water as he pulled his swim trunks off, his cock spurting again. Ivy froze in the water before bolting away, her fear overcoming her sudden desire to jump on him and get fucked. But before she could get far, Tyler let out a beastial roar and something wrapped around her waist. She turned and was horrified to see that it was Tyler's arm, the skin bubbling and forming suckers. She tried to fight, but his leg shot out, loosing its original shape as it changed into another tentacle and bound her hands together and started to reel her back in.

The blonde Julia, on the other hand, was having no such reservations. When she saw the other two men's stretched swimwear, she had given in to the virus and went for them. Neither was anything more than average, but she didn't care, submerging herself underwater and yanking her own swimsuit off. She immediately took one of the men, Seth, in her gaping cunt and Warren, the other, into her mouth. Both groaned and came quickly, their cum instantly being absorbed into Julia's changing body.

Julia spontaneously orgasmed as she felt the men's cum flow through her body, the hot liquid spreading through her. Her thoughts lost form as her physical body followed, her arms and legs dissolving as she lost control of herself. Her skin turned a light blue shade and her entire body collapsed on itself, turning her into a blue blob with two dicks in it. She slid off of them and slowly came back to herself and managed to reform her body, with some notable changes.

Her breasts swelled to massive proportions, forming perfect teardrops on her chest. Her ass likewise exploded outward, becoming plush, jiggling spheres. Her head sprouted, her features indistinct but beautiful none the less. No longer able to speak, she burbled at the boys, who were much more muscular and sported longer dicks and were quick to slam them into her again, though this time Warren plunged directly into one of her tits and Seth into the back of her head, the new goo girl's gelatinous body welcoming them and beginning to massage them, hungry for more cum.

Ivy's transformation was also coming along, the scared, naked woman now being fucked by the changed Tyler. His body had become that of an ancient ocean leviathan, tentacles coiling in the water and wrapping around Ivy, securing her in place. One tentacle in particular, the man's altered dick, was pistoning in and out of Ivy's pussy, the woman moaning weakly at every thrust. She could no longer fight her captor and didn't want to, surrendering to the pleasure of being fucked by the monster. He came inside her for the third time when she finally started to feel her changes begin.

Her legs, long and muscular, became harder and harder to separate, until she couldn't move them at all. She felt them prickling as her skin changed. Despite her restraints, she managed to look down and saw purple scales appearing all over her lower half. A thin membrane encased her legs, quickly becoming thicker. She lost sensation below her waist for a moment before it came rushing back, only instead of feeling two legs, she now felt one powerful tail. Fins grew out of it, as well as along her back and arms, and gills appeared on her neck, allowing her to breathe underwater and completing her transformation. Through it all, Tyler continued to fuck her, his cum flowing out of the mermaid's cunt into the surrounding water.

From afar, Aiden observed the five humans fuck, change, and keep fucking. He watched them for a minute or two, idly jerking his own cock and debating whether to join them or not.