After a couple minutes of watching the two frog women go at it, Kyle could resist no longer. He'd already had sex with both of them so what would they care if he watched them have sex with each other? Kyle started stroking his erect penis while he watched the two girls kissing and caressing each other on the bed, their slimy green bodies rubbing against each other. He thought of how he had pleasured both of them earlier. Kyle had never had a frog fetish before, but he wondered if this night would be the beginning of one for him. Sam and Becca were too busy with each other to pay any attention to him.
Kyle realized his was sliding up and down his shaft with remarkable slickness. He looked down and was shocked to see the reason: his green webbed hand wrapped around his slimy green penis. A quick glance revealed his other hand and both feet were green and webbed as well.
"Oh shit" Kyle said. He was transforming back into a frog man from the arousal even though he wasn't wearing the costume anymore. It must be a side effect of the device.