Mac has finished the first half of the circuit, and now for the probably much slower trek home. He realizes he may have put on some weight, sure- but he can burn it off before he gets back. Enjoy!
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"Hngh!" Mac grunted mightily as he pulled on the wagon, starting to pant— the stallion was starting to have a real problem understanding just what was going on. Were the supplies he bought to help him with the second leg of his journey really that heavy? He hadn't felt so tired just by carrying something in years. Finally, as he began to pant, he had to stop, resting one thick arm against a sturdy tree.
"Agh— ah… Y-yup… Nope. Takin' a break. Jus' for a couple minutes…" Mac grunted as he turned to look back at the wagon. With a low grunt, he rested his considerable bulk on a nearby boulder and winced slightly as he saw his fritter and pie-stuffed belly pool against his overalls and filled his lap and then some, thick reams of fat starting to spill over his trunk-thick thighs.
His mouth twisted as he looked over himself— he hated that Applejack had been right. Again. She had warned him about putting on weight, but Mac figured there was a difference between "Oh you might need to wear your fat pants for a month or two while you burn off the few extra pounds," to "you look about as round as the apples you're hauling."
The stallion's thick musculature was only just showing itself under several plush layers of blubber. Every part of him was soft and pliable, his face rounded with extra chins, his growing, bench-crushing rear bouncing with each step as his over-grown thighs rolled off one another, and his enormous belly sloshed against his clothes whenever he moved. Was this really it? He was going to have to start his way back to Ponyville to make it back for the big celebration at Hearth's Warming, but was he just a big, fat blob now?
"Nope," he shook his head, snorting angrily. He wasn't going to let himself be some fat, useless lump. With a new, invigorated sense to prove himself, he heaved himself up, having to rock back and forth to get his belly building up momentum to let him stand up. He stomped over to the wagon, squatted down as best he could until his belly brushed against the road, and heaved the wagon up over his head with relative ease. Huffing as he held it aloft for a few seconds, he set the wagon down again.
"A'right… a'right. Y'see? Yer still plenty strong— jus' not so… good with stamina." He reached into the wagon, snatching up another apple fritter. "Just… just gotta get somethin' to keep up my strength, that's all. I'll get Rainbow Dash to get me on some cardio after this… eeyup," he muttered to himself, picking up the reins as he gulped down the fritter and then moving down the road again. He kept thinking about getting on to the next town— they had a nice diner, and he was going to earn a good meal after all this. Honestly, he had been getting a little tired of apples anyways…