The next morning, Undyne woke up at the crack of dawn, just like she always did. Having followed Alphys' instructions, she was still wearing the collar. She sat up and yawned, but involuntarily released a rather large belch. Immediately, she clapped her hand over her mouth, taken aback slightly. Gas buildup? How? Was it something she ate? She stood, and thumped on her chest a few times, before feeling her belly. She...felt fine. Didn't feel sick or anything. She walked over to her mirror and looked at herself. She reasoned that it must've been a side effect of the collar. If it worked like an appetite suppressant, it must've somehow simulated the action of eating food, which must've confused her body somehow, and that was what caused it. Satisfied with that explanation, she got dressed.
Little did Undyne know, that yesterday, after receiving her collar, Alphys approached Toriel, Asgore, Frisk, Papyrus and Sans, and given them each a simple red collar like the one she too now wore. She told them it was an experimental, but perfectly safe, method of weight loss. That it would purify whatever food was eaten with it on, and filter out the beneficial nutrients from the excess gluten and saturated fats and that sort of thing, resulting in a far healthier diet without having to sacrifice anyones favorite foods. She suspected Sans knew she was being dishonest, but if that was the case, he didn't care enough to say anything. And so, as Undyne sat down to her own hearty breakfast- rich in proteins, minerals, fibers, all the nutrition one could need for a full days worth of workouts, she was unaware that her abs were less defined than they were yesterday, belly bulging out the tiniest bit and just a tad softer, her flesh was bulging ever so slightly out from her waistband, forming the faintest hints of a muffin top. These were the effects of a relatively subtle layer of fat that had formed from when she'd technically consumed seven entire dinners- counting her own- last night. And she didn't notice as her mildly snug jeans became slowly tighter and tighter, as she inadvertently consumed six full breakfasts- aside her own which she normally ate- all at once.
After Breakfast, Undyne went outside, for her customary morning jog. She made it a few blocks, but found herself getting winded, far sooner than she'd usually be. Only a couple blocks later, she was panting, and sweating, way more than she should be. It felt like she was nearing the end of her run, when it'd only been a fraction of what she was used to doing. Her thighs, squeezed into now tight jeans, rubbing into each other far more frequently than they should. As she jogged her wider than normal hips and enlarged ass swayed and bounced in tune with her slowing steps. Her exposed midsection, bulging outwards and spilling over her waistband in all directions, a small but respectable muffin top, was jiggling in ways it hadn't in a very very long time. Her breasts had grown to the point of straining her bra, the flesh of her cleavage also spilling out from her shirt. She slowed, slowed, and stopped, panting heavily and glistening with sweat. She felt like she had to sit down, so, she went over to a nearby bench and plopped down, her new stomach fat bunching up slightly as she did so. How could this be happening? She thought, could the collar have done this? No, no, that didn't make any sense, Alphys was a genius. There's no way she'd get it this wrong. But, that's when she realized, maybe it wasn't wrong. It was supposed to make her bulk up, gain more muscle, right? Well, weight train and cardio are different workouts, they affect the body differently, maybe an adverse effect of being stronger was being slower.
"Yeah... makes sense..." Undyne said, out loud, to herself. No one else was around, but, she just felt like saying it aloud, for no particular reason. She just needed to hear a voice, even her own. "I guess I'll change my workout routine... light cardio, more lifting... I'll replace the jog in the morning with some bench presses...I might have to change my diet too, more protein... just more food in general. Need to get some mass."
Undyne stood up, wiped away some sweat, and licked her lips. Maybe it was thinking about the food she was gonna start eating, or maybe that run took more out of her than she thought, but she was feeling a bit hungry.
"Speakin' of which, might as well start right away. Second breakfast, gonna get way more protein up in there if I wanna get real ripped!" And so, she began to walk home, at a nice leisurely pace, her fat ass straining her jeans, wobbling and bouncing even at the reduced pace she was taking.
Meanwhile, Toriel was treating herself to an extra slice of pie...and, just one more. She couldn't help it, the knowledge that there wouldn't be any consequences to overeating, thanks to the brilliant Dr. Alphys, made the temptation of a little extra snacking impossible to resist. Alphys herself was eating at the moment too, in her lab, reading over some old research and devising an experiment or two to further test the proposed hypotheses, she was stuffing herself with a party sized bag of chips and a liter of soda. She was also planning to eat a chocolate cake she'd had lying around for a while later, but she hadn't before had the opportunity to enjoy. She admitted to herself she was being excessive on purpose, so more food would go to Undyne, but that knowledge that she wouldn't gain anything, no matter how much she ate, it was very freeing. And so, as Undyne herself walked home, she ever so faintly grew fatter and fatter by the second, without even realizing it,
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