Jen fell back onto her bed as her body went numb. Try as she might, she couldn't move. Even her eyes were fixed in place, the rythmic beating of her heart filling her ears. The silence was agonizing. And then she felt her arm bones disintegrate.
What the fuck is happening to me?! she thought, as the transformation began. She felt sick as her arms and legs atrophied and disappeared. A pressure built in her chest as it puffed out, her abdomen following suit. She grimaced in pain as her spine began to lengthen, rib after rib expanding under her skin. She felt her organs push and pull, shifting around under her skin.
Her skin.
A shiver went over her body as she felt her skin grow cold. It dried out, becoming scaly. Her spine cracked as it lengthened, the growth speeding up. She felt her abdomen, long and muscular, begin to thicken. Her neck followed suit as her pelvis finally dissolved. With a sickening pop she felt her anus pull forward, merging with her vagina into a huge cloaca, She wanted to cry as she felt it push further and further away, her spine growing a foot per second.
The second passed like hours as her body grew. She felt it push against the far wall, bending far more than she thought it should be able to. It pushed against the next wall soon enough, knocking over her dresser and crushing a chair in the process. Eventually she felt the numbness subside, and her growth finished. A final jolt passed through her skull, her tongue forking as her jaw split in half. She felt her nose and mouth smooth and push out into a large maw, blocking the lower half of her vision. A sigh of relief pushed through her foreign nostrils as her transformation finally finished.
She pulled her head up, and would have screamed if she still could. Instead, a mortified hiss echoed through her bedroom. Coiled all around her was the massive body of a 14-meter long snake. She had become a titanoboa sphinx.
She wanted to cry as she looked at her new, huge form. Brown-green scales covered her new body. It filled her bedroom, all of her furniture smashed and destroyed by her powerful bulk. Even the thinner parts of her body, like her neck and tail, dwarfed her old body's thickest measurements. Her tongue flicked out of her new mouth, delivering a barrage of sensory information. Her head swam as the sheer size of her new body overwhelmed her human brain.
As she took stock of her new form, her eyes glanced at her old mirror. Half hidden under her coils, she made eye contact with herself. Her blonde hair was still tied up in a ponytail, her eyes filled with sorrow. Directly below them, her head turned into the massive snout of a titanoboa, no semblance of human remaining. Tears rolled down her cheeks as she opened her mouth, her jaw opening wider than her old human one ever could. Her pink mouth stared back at her, agape. It dwarfed the rest of her head. She realized with horror and shock that she could swallow her old body easily, as easily as she would have eaten a grape. Her new mouth alone was larger than her former human torso.
And then she felt her new, huge stomach rumble...