Cassandra giggled as she lay down on her stomach, though she guessed her whole body was her stomach now since she was basically a giant worm with a human head at this point. But she quickly put her mouth to the dirt and bit into the dirt. A large clump of dirt pulled out of the ground and went into her mouth as she chewed before swallowing, feeling the dirt going through her new digestive system as Cassandra frowned, her tiny mouth unable to eat enough for her whole body to get into the ground. "I wish that my neck was a fat as my body, and that mouth mouth was the size of my head." Cassandra wished as her body started changing again.
Her neck quickly started plumping up, fattening until she didn't even have a neck at all, her head was simply attached to her body. But the second change was much more drastic. Her mouth started to expand, Cassandra's mouth forced itself open as her eyes moved to the sides of her head as her head pretty much split open. Her nose was just gone as the front of her face became one giant hole of a mouth, big enough that it took up the entire front of her head and leaving her eyes at her sides.
With her new giant mouth Cassandra bit into the dirt, ripping out enough dirt with her mouth and swallowing to make a hole the side of her head. And she continued eating this way as she slowly made her way underground by eating. At the other end of her body long strands of dirt colored pooped were forcing their way out of her tail, something that gave Cassandra great pleasure as she continued eating until she was entirely underground.
Dirt clung to her naked body as she settled underground, stopping to a moment to let herself digest and poop out all the dirt she had eaten behind her. Cassandra was happy and amused at what she had become, and she was wondering what to do now.