The events of the day were wrapping up and most of the athletes had already retired to the Olympic Village, aside from Mario and Sonic, who had agreed to have one last friendly race. Mario, of course, didn't expect to be able to come close to beating the famous blue blur, but he still enjoyed the challenge, and was honored to be in a one-on-one race with Sonic. Mario, panting, arrived at the finish line to find Sonic there tapping his foot impatiently and wearing a smug grin.

"You sure gots-a me beat on the track, but I'm-a more of an acrobat than a runner. Next time, let's-a make it an obstacle course!" Mario pleaded in his thick accent.

"You got it, pal!" Sonic flashed a thumbs-up. "For now, let's hit the showers and head back to the village."

Mario nodded and they headed into the locker rooms. Everyone else had already left, so the two were the only ones there. Sonic undressed first, removing his gloves, shoes, and socks and laying them on the bench. Mario suddenly had a strange thought... Sonic was an animal, and he didn't wear pants or a shirt to begin with. But somehow, when the garments he did wear were missing, he looked very... very.... naked. Mario shook his head and tried to clear his head of the thoughts. He started to undress himself, stripping his hat, gloves, shoes, socks, overalls, shirt, and underwear and stuffing them all into his locker. He blushed a little bit, feeling awkward as he realized that he was naked and alone with the hedghehog. Sonic noticed him blushing and gave a reasurring smile and nod, then headed into the showers and turned the water on. Mario let out a deep sigh trying to keep his composure and followed Sonic into the showers.

Mario turned on the showerhead adjacent to the one Sonic was using and started to lather up his body as deliberately as possible, trying not to make eye contact with the soaking hedgehog who had already started cleaning himself. Sonic gazed at the gruff italian's dripping figure.  Sonic thought, Mario couldn't be more cutely short, stocky, and round. A plump belly, thick thighs, bubble butt, and an overall soft and curvy body that ached to be caressed. Mario was famous for his thick, luxurious stache, and the hair elsewhere on his body held up to the same standard. Mario had a good amount of arm and leg hair, but what really stood out was the big, coarse piles of fluff padding his chest, underarms, and pubic area. Right below the thick pubes, Sonic could see Mario's short but thick uncut dick, the warm shower water continuously dripping down from it to the tiled shower floor. 

Before he knew it, Sonic had a big, throbbing erection that he couldn't contain. His dick stood tall, the shower's water dripping down the shaft and collecting on his furry blue balls before dripping to the floor. Sonic's fur was now completely soaked wet. His body was slick all over, his ears and tail drooping a bit from the weight of the water. Sonic, at first, blushed a bit, embarassed by his hard-on. But then he noticed that Mario was deliberately not looking in his direction at all. He took the opportunity to do a little teasing.

"What's the matter, big guy?" He stepped next to Mario and slung an arm around him. "We're all dudes here!"

Mario, who was looking down the whole time, was suddenly treated to a peripheral view of Sonic's raging boner.

"Mamma mia!" Mario cried in shock as he jumped a bit in surprise.

"Woah, calm it down Mr. Stache" Sonic held Mario still in his arms.

Mario let out a deep breath "uh... I ... uh... you just-a surprised me is all..."

Sonic positioned himself behind Mario, holding him close, pushing him lightly against the wall, while pressing his hard cock against Mario's butt.

"You like this, don't ya?"

Mario whimpered a bit. "Y-yes..."

Sonic teased Mario's tight hole with the tip of his penis.

"Think you can take it?"

Mario gulped "...Let's-a go"

Sonic pressed his hard dick into Mario slowly.

"Mmm... that's the stuff" said Sonic.

"Ohhh...." Mario lightly grunted as his tight entrance was spread open by Sonic's dick.

Sonic started humping Mario's plump bottom gradually getting faster and faster. His cock throbbed and leaked precum inside the tight plumber.

"You ready for Sonic speed?"

"Y-yes-a please!" Mario begged.

Sonic started pounded away swiftly, his hard member jamming in and out of Mario's ass with great speed. With every thrust, Sonic's dick throbbed harder and harder, as he approached a powerful orgasm.

"Ohhhh YES!" Mario moaned.

Sonic thrust faster and faster until finally erupting his thick Mobian spooge, the speed causing it to sloppily burst everywhere.

After panting for a while, Mario and Sonic rinsed off and stepped back into the locker room to dry off. Mario sat on the bench and noticed that now he was the one with a hard-on.

"Say Sonic, could I get a turn on top?" Mario asked with a nervous smile.

Sonic replied by getting on his knees in front of Mario and taking his thick uncut italian cock into his muzzle.

"Ohhhh..." Mario moaned in delight.

Sonic worked his tongue around Mario's dick, fast and agile, as usual. He then started to deepthroat him quickly.

"That's-a bit easy for you, huh, Sonic? Want to make it more of a challenge?"

Sonic's ears perked up at the word and he spit out Mario's cock. "How so?"

Mario went to his locker and took out a mushroom. He ate it, and instantly, his erection inflated to three times its normal size.

"Oh! Now that's what I'm talking about!" Sonic exclaimed.

Mario sat back down and Sonic started to try to deepthroat again, this time struggling quite a bit.

"I think-a there's only one place it will fit now" Mario said with a smirk.

Sonic smirked back nervously and turned around to hover is small rump over Mario's lap.

"Ya-hoo!" Mario shouted as he grabbed the hedgehog's thin body at the waist and pulled it down on his thick, bulging member.

Sonic trembled in pleasure and pain.

"You-a all right, Sonic?"

"Y-yes... please don't stop" The hedgehog whimpered.

Mario followed the request and continued to guide the hedgedog up and down on his enlarged cock, his throbbing erection filling Sonic's insides to capacity. He stuffed the whole length inside until his hairy balls were pressing against Sonic's rump, then he pulled him up and back down again. Tears of pain dripped down Sonic's face, but he was filled with pleasure as well, aroused and in complete submission. Mario began to pant as his cock throbbed, feeling ready to burst. Sonic squirmed and whimpered. Finally Mario's cock exploded with his warm seed deep inside Sonic.

"Ahh... yeah..." Mario moaned.

"...Good job... Mr. Stache" Sonic teased, blushing and panting deeply.

After panting for a while, Sonic and Mario got cleaned up yet again, then headed back to the Olympic Village together smiling and laughing. They would be keeping this unofficial Olympic event their little secret.