Vicky looked at her hands. The webbing was now all the way to her fingertips. Her toes seemed twice as long as normal, and were completely webbed as well. Dark green blotches were developing all over her body. And still something felt very strange about her midsection - she could tell it was her groin specifically. Vicky turned the shower water temperature lower, trying to lose the feverish feeling. And despite it all she was feeling strangely horny.
"Vicky, are you still in here?" It was her teammate, Amelia. The two had been friends throughout high school, even before being on the swim team together. Vicky groaned.
"Are you okay?" Amelia asked. "No..."
Amelia pulled back the shower curtain to see her friend slumped against the wall of the shower, looking unwell and not just because of the blotchy skin and webbed feet. Vicky looked over to see Amelia wrapped in a towel, her hair still wet from her shower.
"What's happening to you?"
"Bad reaction" Vicky muttered. "PEDs. Please don't tell."
"Steroids don't do this," Amelia pointed out.
"No...something with frog DNA..." Vicky gasped.
"That would explained the webbing and the blotches" noted Amelia.
Vicky groaned. "Something's happening. Something coming out of me..."
The two girls watched in horror as the cause of Vicky's abdominal pain was revealed. Something was coming out of her vagina. It was big and green. "This can't be happening" said Vicky. "I'm growing a penis."
Amelia had a sudden realization. "Did you ever read Jurassic Park?"
"I only saw the movie" said Vicky. "Why the hell...ugh...does it matter?"
"The dinosaurs were recreated with frog DNA, but they used a species from Africa that can change biological sex when the male-female ratio gets thrown off. So all the dinosaurs start out female, but unexpected some of them started turning male. I think you got some of the same DNA. Being around a bunch of female swimmers for hours triggered it."
"This is crazy..." Vicky said. But the thing between her legs suggested it wasn't impossible. She slowly wrapped her hand around her big erect green frog dick and immediately moaned. "It's so sensitive!" Vicky began to absentmindedly stroke herself.
Amelia was becoming aroused watching Vicky. The half-frog girl still had her breasts, which if anything seemed firmer. The areolas, now dark green, ended it visible hard nipples. It occurred to Amelia that Vicky might be giving off some kind of pheromones. Even so, though she hadn't admitted it to anyone, Amelia already knew she was bi-curious. It wasn't unusual that her naked, horny, attractive friend was turning her on. Amelia slowly let the towel slip from her body and fall to the locker room floor. Then she stepped naked into the shower and sat down in front of Vicky, almost straddling her.
Vicky watched Amelia's naked body approach and felt her dick twitch. She didn't hesitate to kiss Amelia after she sat down. The girls kissed tentatively at first, then more passionately. Amelia realized Vicky's tongue had grown longer as part of her frog changes. Maybe later they could explore what that tongue could do. For now Amelia enjoyed the feeling of Vicky's webbed hands caressing her breasts. Amelia used her human hands to caress Vicky's penis. Amelia was a virgin, but she'd never wanted a cock in her as much as she wanted Vicky's cock. Amelia guided the big green thing slowly into her.
The two girls began thrusting even as they continued to kiss, arms now embracing each other. It didn't take long before Vicky felt another new sensation as she abruptly climaxed. Amelia clung tightly to Vicky, as an unfamiliar fluid was pumped into her own body, which in turn shook with orgasm.