Vipress eagerly rode up and down on Rick, making sounds of pleasure that weren't quite human. Rick was amazed how lubricated the naga was. Both had been almost continuously aroused since the snake had achieved her human form and it didn't take long before one particularly deep thrust caused Rick to orgasm. Vipress moaned with delight as Rick pumped into her and she began to orgasm as well, her body shaking with ecstasy. Rick and Vipress held each other close until their bodies finally stilled.
The snake woman slid off her human mate then eagerly used her long tongue to draw a last few squirts from and lap up the fluids remaining on Rick's dick then rested her head on his chest. Rick noticed Vipress face was looking slightly more human, her neck a little shorter and more to human proportions. She let out a slight gasp and sat up to reveal a nipple had form on each of her breasts.
"That wasss delightful" said Vipress. "And you have helped me changed further."
"You are wel...ooooo....you are welcome, Vipress" said Rick. "I think my changes are beginning."
Rick's legs began to undergo a similar change to Tabitha's, slowly zipping downward from his crotch into a snake tail.
Tabitha slid into the bed from the floor next to Rick on the opposite side from Vipress and kissed her husband.
"I ssssee you are becoming one of usssss" said Tabitha.
"Us?" asked Rick.
"I feel so sssexy and ssstrong assss a naga " said Tabitha. "I don't think I want to go back to being human."