Thumper was at the beach, enjoying a nice day out with his family - but before he went to swim, he had to go change! 
"I'll be right back!" He told his family, as the lil bunny took his swimsuit and hopped along the sand. He found the changing tent area where animals were coming in and out, getting dressed and undressed. He politely waited in front of one of the changing rooms, until he noticed one was free! It was a tall, green, rectangular tent - the flap covering the front was loose and wavey, rather than tightly closed like the others. It looked available enough!
Thumper hopped right over, and pulled open the front, starting to walk inside as he noticed a little fox cub inside.
"Hey!!" The fox yelped, raising a leg to cover themselves.
"Oh! Sorry!" Thumper apologized, not thinking anyone would change in a tent that wasn't properly sealed. "I just... this was open?" Thumper held up the flap.
"I know it is!" Nick Wilde whined, "It won't close! There weren't any others, and my mom's waiting for me..."
"Sorry..." Thumper apologized again, though, staring ahead, Nick had his swimshorts around his ankles, and a little short foxy part poking out next to it... "Um! If you want, I can hold this closed while you change?"
Nick put his leg down, a little confused - happy to hear he'd get some help! But it was still sorta strange. But, as he stood up a bit baffled, he wasn't covering his small, foxy penis anymore. Not only was it a bit small due to his age, but a bit shrunken from the cold water of the beach! His balls were fairly tight and compact too. Not loose or hanging at all! 
"Okay..." Nick agreed, "Thanks." He raised his leg and grabbed his shorts, realizing maybe Thumper should have held the tent closed from the OUTSIDE instead of in here with him as he was naked. But... too late for that, or too late to seem worried.
"Don't... say anything!" Nick puffed out his chest, trying to seem tough. "I'm still a growing fox! This is normal!" His face grew serious, trying to sound proud of his body. But he shyly looked down at his shriveled little winky, "Also it was kind of cold in the water... don't hop in all at once." 
Thumper blushed, not expecting Nick to go on about his privates - but the little fox might have realized he was enjoying this too!
"Alright." Nick nodded, typing a towel around his waist - looks like he was done with the beach, out of his suit, and just ready to head home in a towel!
...Though, he turned around to get his stuff and go - since it was tied above his tail, it showed his little naked butt cheeks easily! Thumper gasped, as, when Nick's legs spread a bit, he was certain he could see the little fox's tiny innocent hole back there. Accidentally showing it off to another boy in the tents, unaware!
"Ah!" Thumper wanted to warn him.
"What?" Nick looked back.
"Y-you might want to tie your towel on around the front..." Thumper warned Nick.
The clever fox felt a breeze by his buns, and realized what he meant. "OH!" He quickly took off his towel - baring his buns for the bunny, and tying it under his belly button. "Okay, thanks carrot boy. You saved my butt, literally!" Nick turned around, butt covered, but his towel parted around his tummy, and with his tail under the towel, it lifted it enough to spread and show what was underneath the front of Nick's towel. His small, cute, tightly-packaged little...
"Nuts! I gotta get going!" Nick hopped over to Thumper, patting the side of his bunny belly to get him to move so he could rush out. "Take care, kid. Thanks!" 
Nick dashed on ahead to go meet with his mother - accidentally having many beach boys and girls see his little penis flopping with each little step and skip of his!
"Well... better than him showing off his..." Thumper thought, remembering that little secret fox hole hidden under Nick's tail. He shook his head and began to get changed - not wanting to make it hard for his own little parts to squeeze into his swimsuit!