Mario's feet kicked and squirmed as he was held by the overalls, trying desperately to charge Bowser. Seeing him chowing down stoked Mario's anger to no end - if he couldn't enjoy his food, why should Bowser? The thought of retribution remained in his mind only as long as it took for Jr. to issue his command - after which, Mario could feel his body go stiff, as though absorbing the younger Koopa's command into his very essence.
As soon as his feet touched the ground, Mario felt himself move as though on autopilot. He walked through the drab, grey brick corridors of Bowser's fortress thoughtlessly, but with the vague sense of security in where he would end up. Soon he found himself before a heavy steel door, and behind it lay... A surprisingly benign closet of cleaning supplies. Mario's brow furrowed as he began to pile items onto a cart - he recognized that he was acting oddly, and the thought of cleaning Bowser's room definitely felt strange, but he just couldn't stop himself. Rather - he couldn't muster enough... Motivation to stop himself.
Mario pushed the cart down the halls - passing patrolling Koopa Troopas on the way. They paid him no mind - not even regarding his presence with a sense of surprise or novelty. He just blended in, like he belonged there.
Eventually he arrived at Bowser's room, gated by a set of massive doors - even more imposing to the still-diminutive plumber - with a stone bust of the Koopa king glowering down at him from above the doorway. Mario felt his body quake at the sight, quickly averting his eyes. Usually the sight of his archnemesis inspired a bold sense of resistance, but... Admittedly, he couldn't shake a sense of intimidation from where he was standing now.
Bowser's room was... Very much scaled to the Koopa's size - making all of the furniture loom over Mario. Despite this, he quickly got to work, grabbing a broom and beginning to sweep a fine coating of ash on the floor into neat piles, beginning to scrub scorch marks off of the brick... Eventually he managed to clamber up to Bowser's bed - the thought of simply jumping up to it not occurring to him - and he started to tidy up the sheets, but... As Mario leaned down to do so, he found his body compelled to do so oddly. Rather than reach down with his hands, Mario found himself taking a corner of the sheets in his teeth, starting to drag it into place. Strange as it was, Mario felt like it was... Preferable, so by the time he was ready to hit the next corner, he did it again, and again...
Working with his mouth became much easier than using his hands - using it to grip tools with a surprising sense of ease. When his mouth was empty, Mario started to huff and grumble. Even if the work was easier, it was still frustrating to do. He didn't like it - but started to think he had no choice in the matter. What else could he do - stand up to Bowser? ... He couldn't do that, right...?
In reality, Mario's mouth yawned open wide - wider than was normally possible for the plumber. His head and mouth had become considerably broader - distinctly oversized, and the beginnings of a fang poked out past his lower lip. He'd begun to snore loudly, interrupted occasionally by a grumpy grumble. Beneath the covers, his arms were wrapped around his body - and even then, the sleeves of his pajamas had come to cover them entirely; his arms starting to grow smaller while his head and even his feet grew disproportionately larger. By now, anyone could notice something was distinctly wrong with him - but the question was, would anyone notice before it's too late...?