Author's Notes:

It's been awhile since I posted a story, but I've been hard at work trying to build up my creativity, motivation, and writing skills. So, I'm going to start posting these stories one at a time, every two days. This first one is a three-parter based on typical harem tropes. Please note that this was purposely written as a light novel. So expect goofy thoughts and antics. Although I did try my best to keep them as in-character as the situation (and tropes) allowed. I really hope you guys enjoy all these stories, and especially this one!

Thanks to lolifriend for supplying ideas and tropes to play around with.

And for now, enjoy~

Disclaimer: The Loud House Copyright Nickelodeon (2021)

I, A HIGH SCHOOL GRADUATE, SHOULD BE ENJOYING MY SUMMER VACATION, BUT MY TWIN LITTLE SISTERS FORCED ME TO GO TO THE WATERPARK!

I've lived an ordinary life. I have a small group of friends that have stuck with me since grade school. I'm not very athletic or smart, but I somehow managed to get into my dream college.

A specialized comic arts college that focuses on eastern formats.

That's right, I'm going to become a hentai artist.

My parents think I'm crazy. Some of my sisters now call me a pervert.

But I will show them all! I will become the richest eromanga artist in the world!

The catch is that this college is several states away. I will need to move away from my family's home in a few short weeks.

What sisters still see me as human say they will miss me. The others say they'll throw a party after I've gone.

This kind of chaotic familial love is what I've grown to both love and hate. Ever since I was a little boy, my sisters' emotions and thoughts seemed to come and go like freak storms. But it doesn't change the fact that I love them all just the same.

However, there are two that seemed to take the news of my imminent departure hard.

My twin younger sisters, Lana and Lola, have been extra clingy.

I can't get any time alone. They're always chasing me down, barging into my room, and holding my arms.

This kind of treatment would be fine in moderation. But I'm an eighteen-year-old man now. My twin sisters are both thirteen, and they've honestly developed into cute teenagers.

Lana, the oldest twin, has blonde hair that comes down almost to her shoulders. She normally wears it up in two pigtails, with a red baseball cap sitting backward on her hair.

She wears cutoff blue-denim bibs that barely cover her butt cheeks. One strap is always hanging past her shoulder, too. With a green T-shirt underneath.

Her outfit's complete with a pair of dirty sneakers and light blue socks that come halfway up to her knees.

Lola, the younger twin, has beautiful, golden hair that comes all the way down to her butt. She's spent years taking care of it, and ensuring she was as flawless as a teenage girl could be. A pink headband swoops her bangs out of her face, yet a few wispy strands still flow toward her left side as they did when she was younger.

A pink, flowery summer dress covers her modest body, with cutoff sleeves and a hem that stops a few inches short of her knees. A white collar circles her neck, with a bow clasping both sides together. Pink slippers protect her pedicured feet from any unsightly damage.

These two girls could stand side by side with the same gorgeous hue of golden hair, height, and figures.

They're shorter than I am. Their heads come up almost all the way to my chin.

They're alike in as many ways as they are opposite. Yet, they shared one last common feature. Rather, a skill that has been perfected over thirteen years.

A puppy dog eyed pout that could bring a man to his knees, groveling at their feet.

Sure enough, I continually fell victim to their overpowered skill.

And this is my story's beginning on how the end of my summer vacation was stolen away by my cute twin little sisters.

They convinced me to take them on a day trip to the waterpark in the next town over. Against their weaponized irresistible cuteness, I really had no choice but to accept their terms of surrender.

So, we packed everything we'd need before heading out. This included our swimsuits, sunblock, towels, and other necessities.

The twins were very giggly as they put their things in the back of my car.

Ah, I forgot to mention. Saving up all my money from working summer jobs the last few years allowed me to purchase my own car.

I wouldn't have to take Vanzilla out to pick up chicks. Well, if any chicks even wanted to get picked up by me.

Another cruelty experienced from having such clingy sisters, is their natural tendency to run off prospective girlfriends.

Clyde compared the twins to lionesses that were hellbent on running off any new females from encroaching on their rightful territory.

The sleek blonde hair, catlike hissing, and their tendency to clutch onto my chest every time another girl tried talking to me in public made the comparison a little too embarrassing.

Lana and Lola were my twin little sisters. I couldn't be entertaining any immoral thoughts about them, let alone any of my sisters. I love them all, but as their brother. That was all there was to it.

I kept reminding myself that even as they teased me, telling me I'm going to faint from blood loss when I see them in the new swimsuits they'd just bought yesterday.

Families went on trips all the time. Naturally, those trips often included beaches and waterparks.

I had to admit to myself that it could be a little weird for myself to go with just two of my sisters. But my intentions were pure.

I knew I'd be gone for a long time, and they wouldn't be able to see me for months at a time. So, I kinda also needed this trip, too. As a chance to make some wonderful memories with Lana and Lola before I move away.

The twins played rock, paper, scissors, and Lola won the privilege of sitting in the front passenger seat. A trophy that she evilly lorded over Lana.

The princess sat lightly onto her throne, and delicately fastened the seat belt across her breasts before laying her hands on her lap.

From this position, she was able to watch me the whole trip. And that's pretty much all she did. Alternating between sighing and giggling, my little sister gazed at me the entire drive.

Lana wasn't happy to be stuck sitting in the back. But she did take advantage of the situation. I wasn't aware of this until she teased me about it at the waterpark, but at one point she released her seat belt, slipped her bibs down to her lap, lifted her shirt up, and pressed her bra-covered tits against my seat.

Lola's the one that caught her doing it, and had quickly ratted her out for taking her seat belt off.

Yet, that was just the first of many strange happenings that would occur during this trip.

At the onset I had thought I knew the twins like the back of my hand. Even if they swapped appearances, I was the only one able to single them out correctly each and every time.

I called it a brother's love.

But perhaps I wasn't as in the know as I thought I was. As the day's events unfolded, I even began to think I didn't know myself as well as I thought I did either.

I'm getting ahead of myself, but we can just skip ahead to the waterpark.

We arrived without incident, although the twins were too excitable for my taste. They grabbed my arms and practically dragged me across the parking lot, as they impatiently stormed up to the entrance.

We'd bought tickets ahead of time and were promptly ushered inside.

This waterpark wasn't extraordinary. It was like every other splish-and-splash amusement park. Giant slides and deep pools, raft rides and child-friendly wading areas.

But the twins gazed at it with such twinkling wonder that I had to look at it once more, with the fascination and youthfulness of a thirteen-year-old.

It still looked ordinary to me, however. But the twins would not be dismayed by my casual indifference.

They yanked me over to the changing rooms. And they even tried to force me into the girl's locker room, but I stood my ground.

When they realized that wasn't going to work, they tried sneaking into the men's locker room.

I wasn't about to let my young sisters become defiled by memories of saggy old naked male bodies. Covering their eyes I forced them back outside and scolded them sternly.

Two young girls shouldn't be trying to peek at their only brother anyway.

Lana and Lola clicked their tongues simultaneously, gave me dirty looks, and sauntered into the girl's locker room. As the door closed behind them, they both gave me one last look that sent a shiver down my spine.

For a single terrifying moment I wasn't sure if I'd make it home alive…

I quickly changed my clothes and applied sunscreen. Then, I went outside to wait on them.

They were taking a long time, however. How could it take so long to change into swimsuits?

I walked near the door, trying to casually listen.

"L-Lana, don't touch me there!" I heard.

Moaning followed soon after.

"Sis, I didn't know your breasts were getting that big. What will you do if Linc starts seeing you as a girl?"

I shivered as I heard Lola gasp even louder.

"W-we have the same- ah! S-same body, idiot. S-stop groping them so much..."

This had to stop. Were they doing this in front of other girls!?

I knocked on the door, but neither answered.

Their moaning was getting louder.

"Lana! Lola!" I tried to yell as softly as I could.

Still they didn't answer me.

I looked around me. No one was looking.

I gulped and looked again. One last time, as my hand touched the door.

The twins' moaning was getting even louder. Someone was going to hear them soon. We were about to get found out and banned from the property! I had to stop them!

I had no choice but to open the door and run inside-!

"Lana! Lola! You can't be doing that-"

My mouth dropped open. I stood there like an idiot.

My twin sisters weren't harassing each other as I had thought.

Lana had her back to me. She was bent forward. Her round, perky ass was naked. She was just about to slip her bikini bottom over her cheeks right as I opened the door. She didn't have her top on either, and as she turned toward me her side boob glanced in my direction.

Lola was facing me. She already had her bottom on, but she hadn't the chance to put her top on yet. Her fingers were holding it up by its strings in front of her chest. The twin pink triangles failed to censor her equally pink nipples from my ravenous gaze.

I felt my cheeks start burning. I yelped and turned around.

"I'm sorry! I-I thought I heard noises and..."

And what? What was I going to do in the girl's locker room? I completely forgot myself as the images of my twin sisters' naked bodies was burned into my memory forever.

Lana laughed, "I knew you wouldn't be able to resist yourself!"

I groaned as I felt her hands slip around my sides. Lana hugged me closely from behind. I groaned even deeper when I felt her hard nipples poking into my back.

"L-Lana, you shouldn't be hugging me without your clothes on," I tried scolding her.

The naughty girl rubbed her breasts up and down my ribs.

"What difference does it make? My swimsuit is so thin I might as well be skinny dipping~"

I shook her arms off me, and, turning around, I put my hands on her shoulders and nudged her away.

"L-Lana, don't be so gross," Lola scolded her as well.

I turned to my other twin sister, and my cheeks flushed even deeper.

She seemed to be furious with Lana. Although I couldn't guess what could make her so angry, the teen had balled her fists at her hips. And her top was squeezed between her fingers.

Her naked breasts were moving as she breathed. Each small, pink tip sharpening as the chilly air caressed them.

I pointed at her, "U-um, Lola, your top..."

I didn't finish. I couldn't look away either.

As my sister looked down, both of our eyes were transfixed on her boobs.

Lola quickly blushed and covered up her chest. I turned around and hid my face behind my hand. And Lana cackled to herself.

Another thing I didn't realize about my sisters was how womanly they were becoming. Their bodies were basically identical. Lana was in good shape from her laborious activities, and Lola maintained her body like a German train station.

Yet, they still had rounding hips as their maturing bodies prepared them for eventual motherhood. Their soft breasts were growing quicker than their sisters' had before them. I was sure they'd at least be a B cup by now. Their smooth, fleshy mounds would be comforting pillows to lay on, or fun mounds to squeeze and play with-

I pinched my cheek to stop those evil thoughts from rooting deeper inside my mind.

I absolutely should not be thinking about my beautiful little sisters like that. Especially when they're navigating the awkward phase of puberty, as they transition into womanhood, develop mature bodies, and become sexy predators that could claim any man they come across-

I pinched my cheek again for good measure.

"Hey, big bro," Lana called for me, "Can you help me?"

I slowly turned around, wondering if it was safe to do so.

Lana was standing right behind me. Once again she had her back facing me.

I noticed she was wearing her top now: an ocean blue stringed bikini that wasn't exactly skimpy, but it didn't hide her curves either.

She turned her head so she could glance at me with one eye.

"I need help tying this string."

I looked down. The bikini top looked like it would stay in place. What was the problem?

"Look lower~" she whispered.

I looked down and saw her bare ass. Only one side was tied together. Lana was holding the strings apart, incidentally allowing me a full view of her rear.

"Lana, I-"

"Please," she begged me with those soft, wet, pitiful eyes.

I sighed and took the strings away from her hands. I wasn't strong enough to say no to those eyes, even when they were asking me to do something highly questionable.

I had to squat down so I was eye level with her ass- I meant with her bikini briefs. I pulled the strings together tightly. My fingers naturally had to stroke her soft hip.

This level of silky smoothness seemed out of character for this rough tomboyish girl. I suspected she had help from Lola...

Her bottom was the same shade of ocean blue as her top. The back piece was rounded and only held about half of her cheeks.

When I finished tying the string, Lana reached down and tugged on the swimwear. Then, she put her fingers underneath the fabric, hooked her finger in it, and pulled it out. Right in front of my face, before I had a chance to even blink, I watched my teen sister fill her bikini briefs with her round ass.

I leaned forward for a second, but then I remembered that I was her brother. She was not my girlfriend. We were siblings. I couldn't just casually grope her ass...

Lana turned around. She was smirking at me.

The front piece was tiny in comparison to the back, and it just barely covered her pubic mound. She was smooth, hairless everywhere. She absolutely had help from Lola.

And she absolutely caught me checking out her body.

I looked away, blushing, and stood up.

Lana was holding a hand over her mouth, not really trying to stifle her laughter.

"U-um, Lincoln?"

I felt a mixture of fear and brotherly warmth as I turned toward that soft voice.

Lola had her back toward me. But her long flowing hair was pulled over her shoulder.

"Y-yes?" my voice squeaked.

She was wearing a pink bottom that was more modest than Lana's. A sarong wrap was tied on one side and covered the opposite hip. The wrap was also pink, but transparent.

Whereas Lana's swimsuit seemed mature in a bold way, Lola's was mature in a soft, subtle way.

"Can you..." Lola wasn't looking at me, but I could see her blushing spreading to her ears, "Help me with my suit?"

She wasn't wearing the top. Surely, that's what she needed help with.

God help me.

I gulped and nodded. Then, remembering she couldn't see me, I replied.

"Sure."

Lana watched me with narrowed eyes as I stepped behind her twin sister. I couldn't tell what emotion was swirling in those sinister blue eyes, and I hoped I wouldn't find out soon.

Lola's back was normally covered by her long hair and her pink dresses. Seeing it bare like this was making me nervous.

She turned a little.

"Here."

She was handing me her top with one hand. I noticed her other hand was covering her breasts.

However, once she turned back around, her arms moved. She grabbed her hair and lifted it up.

Suddenly, I realized what she was expecting me to do. I gulped again.

I heard a quiet snicker from my side as my fingers just played with the bikini top.

It was a vivid bright pink like the rest of the swimsuit. The triangular pads were fuller and would naturally cover more of her breasts than Lana's did. A white banding connected them from underneath, and I suspected that would help lift her chest, making it even perkier.

It tied together in two places: behind her neck, and behind her back. That was no problem at all.

Since Lola was stuck needing both hands to hold up her bountiful locks, that meant only my hands were left to position her top.

Looking back on it now, I don't remember why I conveniently forgot that Lana could have done the saucy part. Though, perhaps a part of me, even back then, wanted to touch my little sisters breasts...

I slouched forward, trying to get closer to her level.

My hands hesitated a few more seconds before finally, they slipped around to her front.

I heard Lola gasp as she presumably saw my hands grasping both cups.

Her breath hitched as my hands raised. We both made soft noises as my hands pressed both triangles in place.

Lola's tits were just as soft and squishable as I had involuntarily imagined they'd be just moments ago.

Using my fingers I made cursory motions, making sure that the pieces were in their proper place.

Then, I draped the strings over her shoulders, and I pulled the white band around her sides. I tied the bottom together first, and then did the part behind her neck.

Yet, my work wasn't done.

"M-make sure I'm not slipping out..."

That mental image - Lola's young breast falling free - was enough to weaken my knees.

My throat was too dry to respond. Something niggled in my mind, trying to remind me that this was going a step too far. My fingers didn't give a damn as they brushed across her ribs.

I used my pointer fingers to slip over her fleshy mounds and stuff her breasts under the twin fabrics.

Once I was sure Lola's modesty was protected, I raised my hands-

And I stiffened.

What the hell am I doing!? I thought to myself as my hands were only hairs away from cupping her perky breasts.

I yanked my hands to my sides.

"Th-thank you," Lola said.

She started fixing her hair into a bun, and I aimlessly wondered why she didn't do that before putting her top on.

Lana was staring at me, and she was smirking once more.

"You better go before someone catches you perving on your little sisters," she teased me.

I looked at the floor, grumbled, and walked out the door.

I didn't know what the hell's up with them, but I had a strong suspicion that this day was only going to get weirder.

We initially got in line for the big water slide.

The queue was crowded, and my brotherly instincts urged me to keep them close.

Lana took this as an excuse to rub herself against my side. Lola leaned into my shoulder while hugging my arm to her breasts.

I really had no one else to blame but myself for encouraging them to meld their bodies against mine.

The sun was beating down on us, and eventually even the girls peeled their sweaty skin from me.

When we were finally near the top, the twins played rock, paper, scissors again - who knows what for - and this time Lana came out victorious.

I paid it no mind until it was our turn to slide down into the pool below.

"Two at a time, please," the bored teenager drawled.

Ah, that might be a problem.

"Um, can we-"

"Excuse us!" Lana butted in, pushing me forward.

Suddenly, I was sitting down on the slide, and Lana was sitting on my lap. She was staring into my surprised face.

I felt Lola sitting down behind me.

Both girls wrapped themselves around me while the temp ignored our blatant rule-breaking.

Lana smirked and my face heated up as she grabbed my hands and placed them on her ass.

"I know how badly you want to touch it," she teased.

And then, she kicked off the platform. And our tangled mess of bodies and limbs careened down the slide at a startling speed. We yelled all the way down, and when we shot off into the air at the very end of the slide, we finally broke apart into three distinct shapes.

And crashed into the pool below.

We surfaced with a gasp. Lana laughed loudly, already wanting to ride it again. Lola fidgeted with her swimsuit, making sure it still looked perfect in every spot.

The awkward beginning aside, this day was turning out to be fun!

At least, I had thought so until Lola and Lana were holding my swimming trunks up between them.

"Are those..."

I looked down instead of finishing my question.

Yep, I was stark naked.

I hurriedly covered my front.

"Give me my trunks," I whispered, as to not attract anymore unwanted attention.

Lana was smirking evilly again, and even Lola seemed to be staring with darkened eyes.

"H-hurry up," I tried again.

But the girls ignored me.

"Do you want to do it?" Lana asked her sister.

Lola's eyes widened. She instinctively shook her head.

"I'll do it then."

Lana took the trunks and then dove underwater.

Lola drifted closer to me as I held my hands firmly over my groin.

I could see a distorted Lana shape under the water. When I felt her hands touching my leg, I stiffened.

"Don't be so tense," Lola finally spoke up with a motherly tone.

I stared at her, surprised at her sudden recovery - and the surprisingly mature tone she used to soothe me.

I felt the swimming trunks getting pulled up my legs. But when they reached my thighs, they stopped.

"I-I can handle the rest," I tried to nudge Lana away by tapping her with my leg.

But the teen wouldn't be shaken. And Lola put her hands on my arm, and smiled at me.

"It's ok. Lana just wants to help."

I stared at her like she was crazy. But people were starting to look our way. I didn't have many choices left.

Lana poked my hands. My groin quivered, knowing just how deliciously close her fingertip was to my center...

I reluctantly pulled my hands away.

After a few seconds, Lana pulled my trunks up, and she even tied the drawstrings for me.

I didn't know what was worse.

Flashing my underaged sister, or feeling regret because she didn't go ahead and touch me...

I came back to my senses when I heard the two start splashing away.

"H-hey, where are you going?" I called out to them.

"Just having a sisterly talk! Meet us by the ice cream stand!" Lana returned.

I had an idea of what those two were likely going to gossip about behind my back, but I tried to ignore the nagging anxieties growing inside my mind.

I paid for three ice cream cones and went over to my sisters.

They were blushing, gasping, giggling, as if they were ordinary middle school girls talking about boys.

I sighed as I sat down on a bench and called them over to me.

Lana sat on one side, and Lola on the other.

My tomboyish sister quickly devoured hers like an animal, while Lola gently licked and savored hers like a delicate princess would.

I tried my best not to look at their small pink tongues licking up soft serve. But the instinct proved too strong for me. Especially when Lana's messy eating habits had a small trail of cream dripping down her thigh. Or when Lola squeaked in surprise as a freezing drop of cream fell between her breasts.

I had to get up and shove the rest of my cone into my mouth just to get their luscious bodies out of my head. The ensuing brain freeze was a godsend.

"Big bro," Lana called out, "What do you want to do next?"

I sighed and turned back around. My sisters looked up at me expectantly. I smiled and shook my messy white hair with my hand.

"Let's try everything and have lots of fun!"

We ended up sampling everything the park had to offer.

We swam in the pools, and raced each other down a twisty water slide with multiple lanes. We even went through the tunnel of love - well, I had to go through twice; once with each sister.

No weird incidents really happened though. The most my sisters did was hug me and sigh as we slowly went through the romantic ride.

They behaved well during everything else, too.

I was bewildered, left wondering if I was the sole pervert that had fantasized about his sisters all day...

"Lincoln!" Lola called for me.

Ah, it was getting late in the day now. We really should think about leaving soon.

"We want to do one more thing!" Lana waved at me, too.

"Alright, I'm coming."

They led me to a familiar door.

"Isn't this the girl's-"

Before I could finish, Lola yanked me inside and Lana had wedged the door shut with a plumber's wrench.

Don't ask me where the hell she was hiding that all day because I didn't have a clue.

All I knew at that moment was that I was trapped inside the girl's changing room, and both of my sisters stood between me and the only exit.

Their faces were flushed - and it wasn't from the sun's heat, I was willing to wager.

"The truth is," Lola started.

"We lured you into our trap," Lana continued.

"And you fell for it, hook, line, and sinker!" the finished in unison.

Oh shit. My virginity was suddenly afraid it was about to be extinguished from existence.