Peach tries to bend the bars, turning into a Royal Koopa.

There were no guards in sight, the dungeon entirely abandoned with the sole exception of the cage and the woman occupying it. Peach walked up to the edge, grasping the thick metal bars in her dainty hands. It seemed like the only possible way out would be through breaking or bending the bars, but Bowser himself was perhaps the only person in the world strong enough to do so. Still, with a faint hope in her chest and a magical coin around her neck, Peach tugged as hard as she could on the bars, trying to bend them in opposite directions.

The gold coin hanging flush to her chest could read her thoughts and obliged her. Just when she was about to give up on this foolish enterprise, Peach felt the bars start to move, if only ever so slightly. Surprised, she dedoubled her efforts and watched as slowly but surely the metal groaned and moved. What she didn't see was a large turtle shell forming on her back, or her shoulders widening as her build become thicker and more hardy. New strength surged through her, the bars bending quicker, as her arms grew more muscular and the muscles all over her body followed suit, expanding and compacting. The smile on her face became a snarl as her face elongated out into a snout filled with razor sharp teeth, her pale fleshy skin replaced with scales, and her bright blonde hair turned a bright red. The whole she was making was almost large enough for her growing form when her stomach began packing on some pounds, growing a small budgy belly that was accentuated by her now larger breasts. A tail grew, spiked, and slithered out of her shell, and the last things to change were her hands and feet, growing claws and scales themselves. As Peach surveyed her handywork, now able to escape the cage, she looked down and saw the body of a Royal Koopa, not too different in size and shape from Bowser, was now her own.