Rick found he couldn't move his legs. Twisting his torso as much as he could to look back and feeling with his hands his tail continued to grow, drawing his legs into it. The transformation was tearing his pants apart. He took off his shirt to find his chest becoming more muscular.
"This is incredible!" said Rick. "I'm turning into a naga from having sex with you."
Vipress was smiling eagerly. "All the better to mate with you" she said.
Rick could smell that the snake woman was still in heat. "This is going to be much harder to hide from Tabitha."
"Don't hide it" said Vipress. "I am willing to sssshare."
Rick stared at Vipress in disbelief. A moment later, his body spasmed and he slowly start to regain feeling below his waist. He looked at where his legs had been, twisting in a way not previously possible. He had a tail like a snake, except that it was still the same color as his flesh. It was not much longer than his legs had been and left him smaller than Vipress. Rick recalled how Vipress had needed to feed to sustain her growth and allow her changes to progress. He felt hungry now too, both for food and for more sex.