Crystal started bucking underneath Kyle as she moaned out an orgasm. The walls of her pussy constricted on his dick and he felt himself reach a climax as he put his frog seed into her. She pulled forwards and slid off of his erection as she started gasping for breath. She was already looking a bit green and he could spot the beginning of webbing between her fingers.
Kyle looked to the other two. Jen looked like she was already pretty far along. She was sixty-nineing Rebecca and he could see that her hands were already fully transformed. As he watched her ass filled out. To his other side Cassie was sitting on Samantha's face, working her hips back and forth. He wondered if that would be enough to change her but suddenly he saw her throat swell up and she gave a "Ribbit."
He turned his attention back to Crystal, who had now rolled over onto her back and was massaging her growing breasts with what were now fully froggy hands. Her legs and feet were also well along in their transformation and as he watched she stuck out her extra long tongue and straight into her own slit. It was only there long enough to give her a taste but she smiled at Kyle as she pulled her tongue back. "This is so weird..." Kyle guessed from her tone that weird in this case did not mean bad.
"Looking good Crystal," said Jen. Kyle looked over to see a fully transformed Jen sitting next to Rebecca. Both girls looked a little worn out, which he supposed that the mutual frog tonguing that they'd just given each other accounted for.
A scream drew all of their attention to Cassie. Who it was immediately apparent was absolutely fine, just a screamer as her body actually shook with pleasure while turning an ever darkening shade of green.
"This is so hot," said Rebecca. "What do you guys want to do now?"