--Evan was eager to help in anyway he could. After all, here he was in the Mushroom Kingdom. It was like a dream... he would finally be able to help out the Princess he adored and respected so much!

"Thank you so much for coming!" Princess Peach said with her light voice and with a polite bow. "We're preparing a big banquet for my hero, Mario~" she said trailing off in as if day dreaming, before coming back, "So it's nice that you want to help out! So we'll need you to help hang up some decorations here, and set up some things there..." she said, pointing here and there.

Evan nodded along, enjoying the fact she was speaking to him at all! "Big...cake...shroom...and..." all these words came a little scrambled, as he was focused on her face so her words went in one ear and out the other.

He snapped out of it and tuned back in:

"...and you can use those mushrooms to help you reach the highest places and lift the heavy things! They're safe, don't worry! We use them all the time. Have fun! Thank you~!" she said blowing him a kiss with a wink as she skipped off to check on the next group of Toads to give instructions.

Mushrooms? Oh, right, like in the games. Wow! He would get to use one of those too? This really was getting better and better. He wished he heard all her instructions clearly, but he was just too distracted with her beautiful face...

Easy enough though! He headed back to where she pointed, spotting the crates with all sorts of mushrooms. He gave them a look through. Green ones. Purple ones. White ones...? Where were the standard red ones?

He looked for a bit, but shrugged. Any of the others should work, he figured. They're all safe (even the purple ones?). He figured he would err on the edge of caution. He liked the look of the white ones, after all. They had a certain air of royalty to them.

And so he grabbed one, and found himself feeling the changes coming. Yes, he was certainly getting much bigger! So it was a good alternate choice. He figured everything was okay.

But that's when it went wrong. He found himself falling onto all fours, gasping, getting bigger and bigger --but his clothes weren't changing with him as they were supposed to. Instead they were tearing at the seams as he grew, his legs thickening with his arms! His belly was getting larger and larger, as he found his hands and feet starting to harden and change, the digits joining together and becoming rock-hard, making a "clap clop" sound as he moved to redistribute his weight!

What?!

He groaned, finding himself heavier...and heavier...he felt his manhood was oddly warm, yet getting smaller...while other things got bigger. He felt as the weight between his legs got lighter, it got heavier slightly higher up below his belly --four nubs were growing, followed by a pink bulge, growing and growing. His pants finally gave way, tearing straight down the middle, a bit left hanging over his back as a rope-like tail grew out with brown hair that matched his hair on the end, as his sweater tore around the shoulders, leaving some on his back and the two down his sleeves.

Oh no...!

He moaned, his voice deepening as his throat thickened, but he felt that he was no longer a he either, as the tail swung over a new sensation... she moaned, moving a leg, feeling a mass slosh and swing, as she looked below herself, seeing the swaying udder far behind her. It was from seeing this she gasped in shock, horns growing out of her head, her face widening, breaking her glasses in two, as her ears turned long and floppy.

Mmmngh...?! Muhh...Mmmnn...

She was resisting the temptation to do it... but it was getting harder to resist. The udders. The horns. The mass...so large...her face pushed out, the large snout with a nose ring... large like a ...

Mmmmooooooooooooooooooooooooooo~!

Cow.

The cow moo'd away, large and clunky, unsure of what happened, exactly, as Peach ran over, looking the cow over, and giggled a little after the shock wore off.

"Oh dear! What happened to you?"

Mooooo~ was all Evan could reply!

"My my, you must have eaten a Mooshroom. Didn't I warn you about those?" she said, looking over. "Hmm but it seems like all the regular mushrooms ran out...oh well! You can still help me this way, you know~?" she said with a bit of a devious grin.

Moooo...?

"Welll we need to bake this giant cake! And that will need a lotttt of milk~" she said, removing one of her gloves, twiddling her fingers.

Just seeing this made Evan excited, her udders filling with milk as if on cue...

"Hehe~ see? You still get to help after all~" she said, signalling a Toad to bring her a bucket...

---

A commission for a user on deviantart of their character Evan getting transformed into a full cow by Princess Peach from the Mario series. Hope you like it~

(Peach and the Toads/Mushroom Kingdom belong to Nintendo, and Evan to his respective owner. I own neither of them).