Mike took a couple of steps back, giving him space and concentrated on something.
Mikes legs felt wierd as his legs were merging together to form a long snake tail about 6'8" long at his best estimate. As the tail thickened at the waist, Mike heard a cracking and felt pressure and stretching all around him. Then the pressure relieved itself as he heard a large rip. Which it so happened that the rip was his skin shredding itself apart to expose his scaled skin to Emily. The cracking was his bones dislocating, growing and relocating to their spots. Mike noticed that there was a vacuum sensation and watched as his penis disappeared to become a working vagina.
Mike looked at her chest as a pair of breasts ballooned out to FF cups. Mikes eyes turned reptilian and she grew fangs as her tongue split at the tip.
Emily looked surprised at the changed Mike.
"Thisss iss my naga form, itsss a sshame that it'sss female" you said to Emily.
"I dont care Mike whether you're a male or female naga"