Pound and Pumpkin Cake were sitting at the beach with their aunt Pinkie, who was struggling a bit with the beach umbrella.


"Erg! There!" Pinkie grunted. "That should do it. Now onto you two."


Pinkie grabbed a big bottle of sunscreen and slathered the white substance all across the toddler twins’ body, even in places where the sun wouldn't shine. Despite the sky being mostly cloudy, Pinkie knew that the sunlight could pierce through the clouds. She learned that from experience, and it was a good thing bakers have adequate health insurance. 


"Wow! We got the whole beach to ourselves!" Pinkie exclaimed as she applied the sun lotion to herself.


It was true. There was not a single pony present at the beach except the trio. There couldn't have been a storm coming, and while the beach houses behind the tall, grassy dunes were spaced far apart, there would still have been a handful of ponies gathered around.


Pinkie shrugged. "Lucky us." She turned to the twins. "Now play friendly, you two. Don't go too far, and if you feel even slightly thirsty, let me know. Got it?"


“Got it.” Pound and Pumpkin nodded. 


They went to the sand covered by the umbrella's shade. The two then dug a hole.


"Woo! Sure is hot today," Pound said. 


"Well, it is summer," Pumpkin replied.


"Yeah. Give me a second."


Pound Cake stood up and grabbed the bottom of his shirt. He pulled it up over his head. His head slipped out of the opening, followed by his arms leaving the sleeves. He then tossed the white fabric onto the beach blanket.


"Why did you take your shirt off?" Pumpkin asked.


"I just felt like it," Pound replied. "Nothing wrong with that, right?"


Pumpkin shook her head. She looked at Pound’s body. Her twin brother, aside from the discarded shirt, wore a dark blue swimsuit and black flip-flops. His top half laid bare. Pumpkin couldn't help but wonder.


"Hey, I've got an idea!" Pinkie exclaimed. "There’s a snack bar not too far from here. Why don't I get us some snowcones?"


The Cake Twins nodded excitedly. 


"Great." Pinkie grabbed her bit pouch from the beach bag. "Stay here, you two. There are some juice boxes inside the bag if you feel thirsty."


Pinkie left to find the snack bar, leaving the twins by themselves. It may sound irresponsible, but the Cake Twins were obedient and trustworthy enough to be by themselves for a couple of minutes.


"You know, Pound, I've been thinking," Pumpkin said as she twirled the sand. "Have you noticed that a lot of colts and stallions can go without a shirt on, but you never see a filly or mare do the same?"


"I guess, but why would you ask?" Pound replied with a question. 


"I dunno. Why would they? Why can't mares go without a shirt?"


Pound sat down. "Hmm, I have one idea. Remember how we used to drink milk from our mommy?"


"Yeah."


"And remember how we thought Pinkie had milk when she took her shirt off?"


Pumpkin covered her face. "You had to bring that up?"


"Well, maybe that is why mares have to wear something to cover their chest. They don't want foals to think they have milk."


"Wait, if that is true, then why do I have to wear something to cover my chest?" Pumpkin stood up. "Do I look like I have milk?"


Pound observed Pumpkin's body. She wore a red two-piece swimsuit and pink flip-flops.


"No," Pound replied. 


"So, there's no need for me to wear this." Pumpkin pointed at her top. "I'm going to take it off."


“Alright. Go for it.”


Pumpkin slipped her fingers underneath her top. She lifted the swimwear until her nipples were exposed. She then snaked her arms out of the arm holes, followed by her head. Once the top part of her swimsuit was off, she threw it on top of Pound’s shirt. Now, like her brother, she was shirtless.


“There,” Pumpkin said. “No need to wear anything to cover my chest.”


“I guess not,” Pound said. “We’ve got the same chests.”


“That’s why we’re twins. Do you…want to feel mine?”


“Okay.”


Pound leaned over and rubbed his hand across Pumpkin’s chest. Her nipples were the same as his. He felt his own to confirm it. After asking for Pound’s permission, Pumpkin did the same thing. It was enough to say it was quite a discovery.


After the twins’ curious touching, Pound asked, “Should we continue digging?”


“Yes, we should,” Pumpkin replied.


After about a minute of digging, the twins heard Pinkie approaching.


“I’m back!” Pinkie sing-songed. “And I got snowcones!”


Pinkie held three rainbow snow cones. One was in each hand, and one was held by her mane. The twins never questioned how she could hold stuff with her mane. They always saw her quirks as being normal for her.


“Wait a second,” Pinkie said. “Pumpkin, why do you have your top off?”


“‘Cause I felt like it?” Pumpkin replied awkwardly. “Is that bad?”


“You know what? I think you’re still young enough to go topless. You can leave it off.”


“Thanks, Auntie Pinkie.”


“Don’t thank me yet. I still gotta give you both your snowcones.”


After Pinkie handed the Cake Twins their snow cones, the two foals thanked her and dug right in.


Anypony would know that no matter what kind of food you would give to foals, they would always find a way to make a mess. Unfortunately, this was one of those times. Even though Pound and Pumpkin had their tummies filled with the sweat and refreshing shaved ice, the sticky syrup dripped down their bare chests and stained the bottom of their swimwear.


“We should get cleaned,” Pound said.


“There’s only one place to go to do that.” Pinkie pointed at the ocean. “Right over there.”


“Okay,” Pound and Pumpkin said as they got up and kicked off their sandals.


“Remember, don’t go too deep, watch out for big waves, and never drink the sea water. It’s super-duper salty.” Pinkie put on some shades and lied on her stomach to get a tan.


The twins hurried to the water and dunked their bodies into the sea. Swiftly, the syrup dissolved from their coats and swimsuits, returning them to their original colors.


Pound giggled. “The water is so cool! We should get Auntie Pinkie to—”


“Poundie! Look behind you!” Pumpkin yelled as she ran to shore.


Pound swung around to see a big wave approaching. With little time to react, he held his mouth and nose shut as the wave crashed into him and sent him tumbling across the sand.


Pumpkin ran up to Pound and helped him up. “Are you okay, Pound?”


“Yeah, I’m okay,” Pound replied. “I’m glad I…uh oh!”


Pound’s swimwear was all the way down to his feet, covered in a mush of wet sand and seawater.


“Uh, you better hurry back to Aunt Pinkie,” Pound said as he covered himself. “I need to wash this swimsuit some more.”


“Right. Hurry back.”


As Pumpkin headed back to the beach blanket, Pound stepped out of his swimwear. He then went into the ocean to rinse off the sand. Once the last grain was washed away, Pound quickly slipped back into his shorts and hurried back to join Pumpkin and Pinkie.


“What do you want to play next, Pumpkin?” Pound asked.


“Let’s build some sandcastles!” Pumpkin pulled out a bucket and shovel.


The two then went on to build the sandcastles. Pound was building the moat when he noticed Pumpkin staring at his lower body.


“What’s wrong?” asked Pound.


“N-nothing,” Pumpkin denied. “It’s just that…I saw your peepee.”


Pound blushed. “Uh…okay. So? My swimsuit was down. Of course you were going to see it.”


“I know. But…it looked a lot different than mine.”


“Really? But why is that?”


Pumpkin scratched her chin. “You know what? It’s my turn to have an idea. Remember when we saw our mommy and daddy in their underwear?”


“Yes.”


“Well, daddy had a…uh…thing down there. Just like your swimsuit right now.” Pumpkin pointed to the wet bulge on Pound’s trunks. “And mommy didn’t. So…it must be that…stallions and colts can only have one type of peepee, and mares and fillies can only have the other.”


“That is a good idea. Hmm.” Pound pulled his waistband a bit. “Do you think that is how the grown-ups know that we’re a colt or filly when we are born?”


“Maybe. Say…uh…could I look at your peepee again? I don’t think I’ve ever taken a good look at it before.”


That was true. Despite the two of them taking baths together, they never examined each other’s genitals.


“Well…okay…but you have to show me yours as well.”


“I will. I promise.”


“Good.” Pound grabbed his waistband again. “Wait…I have a better idea. Be right back.”


Pound Cake got up and went over to Pinkie Pie, who had just flipped over.


“Aunt Pinkie, uhm, can I ask you something?” Pound asked.


“You just did, but what is it?” Pinkie replied.


“Could I uhm…” Pound twiddled his thumbs. “...get nakie?”


Pinkie removed her sunglasses. “What for? Didn’t you get all the sand out of your swimsuit?”


“I did. It’s just that…since we’re here alone…and nopony but us here. It would be nice to…stop wearing my swimsuit.”


Pinkie looked around. “You’re right about us being the only ponies on the beach, and it’s not like I’ve seen you naked before. So go ahead.”


“Really?”


“Yeah. And if Pumpkin wants to, tell her I gave her permission to get naked as well.”


“Thanks.”


Pound went back to Pumpkin.


“Okay, here we go,” Pound said as he grabbed his swimsuit.


He then pulled his trunks down to his knees. Once he let go, it plopped to his feet. He quickly stepped out of his swimwear, and instead of taking it to the ocean to wash it, he put it on the blanket. Pound was now completely naked.


“Gee, Pound, heh,” Pumpkin said. “You didn’t have to go that far.”


“Since you were going to see my peepee, I was afraid Pinkie might catch us. It was better to ask if I could get nakie, and luckily she said yes. So here’s my nakie body.”


Pumpkin looked down at Pound’s crotch. Without any water or clothing, she could see the two quail-egg-sized balls behind Pound’s two-inch pecker.


“Wow. So that’s what a colt’s peepee looks like,” Pumpkin said. “Or what yours looks like.” 


“Well, I can’t say if mine is the same as other colts, since I never saw theirs.”


“Okay, I guess it’s my turn to be nakie now.”


Pumpkin stood up. Just like Pound Cake, she slipped her fingers underneath the waistband and pulled down her bottomwear. After she got out of her swimsuit, she put it in the pile of discarded clothing like the rest. The only thing she wore now was her trademark blue bow.


“Now we’re both nakie!” Pumpkin exclaimed. “And this time it’s not for a bath.”


Pound nodded as he stared at his twin sister’s private area. It looked smooth and small, almost unnoticeable.


“I can barely see your peepee, Pumpkin,” Pound pointed out.


“Well, you can see why fillies don’t have a thing down there.”


“Can…can I touch it?”


“No, that’s a bad idea!” Pumpkin said sternly.


“Why not?”


“Because mommy and daddy said to never touch our peepees. If we can’t touch our own, then it’s safe to say that we’re not allowed to touch each other’s.”


“Oh, that makes sense.”


“So do you want to finish making sandcastles?” Pumpkin sat down.


“Actually, I have a better idea.”


“What is it?”


Pound quickly tapped Pumpkin’s shoulder. “Tag! You’re it!” He then dashed off.


“Hey!” Pumpkin chuckled as she got up. “No fair, you can’t get a headstart like that!”


Pumpkin quickly chased after Pound. Pinkie watched as the two foals ran across the beach, naked as the day they were born.


“Ah the innocence of youth,” Pinkie said to herself. “It must be so fun to streak around like that at such a young age.”


Pinkie then looked down at her purple, one-piece swimsuit and rubbed her chin.


“Nah.” She shook her head. “I’ll save it for another fanfic.”


So Pinkie continued to watch the Cake Twins play nude tag. She hoped that someday Flurry might tag along with them the next time they go to the beach.