"We have an order for a snake girl, rattlesnake, long tail, extra sensitivity, large size penis tongue. This one will do nicely." The doctor said. He jabbed a syinge into Jen's arm. She immediately felt the effects. First her figure improved greatly, becoming bustier and curvier. Then all the bones in her legs vanished, her legs fused together and became a snake tail, tipped with a rattler. Her pussy moved towards the front just before, to avoid being sealed. Brown scales covered the tail. Then her tongue felt very strange. It swelled to a massive size and became very fleshy. She couldn't hold it in her mouth. She opened her mouth and an erect dick came out, stuck in her mouth and so large she had to hold her mouth open as far as it would go. It appeared to be permanently erect. Her change complete, they carried Jen to the next room, where many girls were trapped from the waist down in vacbeds. The vacbeds were suspended in midair and had vibrating dildos and armbinders attached. They forced Jen into an empty vacbed and inserted the dildo into Jen's pussy. They put her arms in the armbinder. Then they turned on the dildo at the maximum setting. Jen's increased sensitivity kicked in, and unable to moved or find relief, she began to let out moans and screams muffled by the dick-tongue, which had begun to throb with pleasure.