"You want to duel me?" Serena asked with a bit of surprise in her voice, her green eyes a bit wide as they stared at the boy in front of him. "Yuya, do you think we have time for this?"

The words felt strange in her mouth, Serena wasn't one to pass up a chance to demonstrate her strength and worth. But they had little more than a week before they traveled to the Synchro Dimension to fulfill their mission.

The guy with the bi-color hair didn't look as worried, simply smiling as he spoke. "It's just a small one, we have been a bit stressed lately and it will do wonders to help us relax."

Yuya's reasoning was sound enough but Serena was a bit unsure, despite what personal feelings she may hold for him, Yuya was sometimes more worried about having fun and being an entertainer than his duties.

Maybe he sensed her restlessness because he smiled and leaned forward a bit. "Let's make things a bit more interesting then, whoever loses will have to obey the winner for a whole week. How about it?"

Now that got her attention, Serena could establish she was the superior duelist and get to order him around for a week? Talk about killing two monsters with a trap card!

With an excited smile and determination burning in her emerald eyes, Serena got into position and activated her duel disk. "No hard feelings when you lose."

Yuya didn't say anything but matched her smile and activated his duel disk, his body more relaxed as he drew his hand.

xXx

"Now that was an amazing fight! Nothing better than two friends having fun, that was an amazing duel. Close too!"

Serena was having a bit of trouble sharing the sentiment, she did agree on something, the battle had been close.

Her moonlight deck put up more than a valiant fight, her draw was good and her strategy solid enough to force experienced duelists down to their knees. But the more the battle went on the more problems Yuya's Pendulum summon gave her, eventually overwhelming her until her life points went to zero while he rested at sixty-nine.

A curious number.

A small, old, angry part of the girl refused to admit her defeat but she pushed it down. Yuya won fair and square. "It was a good duel, but next time luck will be on my corner."

Luck had little to do with it but she couldn't let Yuya's ego get too big, even if he wasn't the type to gloat. Besides, next time she will win without a doubt.

The boy's eyes glinted with mischief as he spoke. "I'll take you on whenever and wherever but don't tell me you forgot our little bet?"

"Of course not." But she hoped he did. "I'm not the type to ignore my own words."

"Amazing! Follow me, then!"

It wasn't as much of a suggestion but an order, for the boy's hand grabbed her own and dragged Serena behind him before she could even ask where they were going. At least while he was walking in front of her, Yuya couldn't look at her red-cherry blush or the way she was looking at their hands locked together with great delight.

Yes, Selena had a huge, teenage-girl crush on Yuya despite her best sense. She couldn't help her heart going crazy when they were close or, in this case, holding hands. And if she was being honest to herself, Serena liked it that way.

The two of them didn't see any other person as they walked together and the girl was very grateful for that, it allowed her to bask in the sweet moment. Eventually, curiosity began to overtake her elation. Where was Yuya taking her? And more importantly, what would he have her do as his reward?

She had expected him to ask for another duel, maybe to hang out or watch some movie.

Maybe something more intimate...

"Here we are!" Serena promptly halted that line of thinking before it could affect the color of her face. Regrettably, her cheeks reddened all the same once she saw the place Yuya dragged her to. "Don't just stand there with your mouth open, come inside!"

Not even stopping to rectify the boy about her mouth being open, it felt welded shut to her, Serena took a step inside the room.

His room.

The girl's green eyes darted from one corner of the room to the other like lighting or a predator hunting for prey, in this case, she was hungry for any details about the boy she could devour to gain knowledge about Yuya.

The room wasn't much different from hers, the furniture was the same since they both lived in the academy. But Serena could see some key differences: a few cards scattered on a desk, some posters featuring monsters, and the smell was different too.

Yuya's scent...

The fact that she didn't take a long whiff at that very moment was a testament to the girl's self-control, and so was the fact that her voice remained even and calm as she spoke. "Well then, I hope we didn't duel for half an hour and I was dragged along to the other corner of the campus so you can show me your room. You could have just asked."

A bit snarky but she had to sound like that, either the excitement would seep into her voice. There are not many reasons why a boy would invite a girl to his room, even fewer if a bet with the words 'do whatever I ask of you,' are involved. But will he ask such dirty things? They didn't go on a single date yet. He wasn't even aware of her feelings for him, was it?

A more important question: Would she say yes?

Serena's brain was working overtime and finished chasing that train of thought by the time the boy spoke. "Of course not, I called you over so you can clean it!"

What?

"What?" Serena wasn't quite sure if she should be completely bewildered or simply angry, maybe both.

She scanned the room again, this time with a more critical eye, and while it was true that there was some dust and a few shirts and pants laid discarded on the floor it wasn't something so bad that Yuya couldn't clean himself in less than an hour. Why waste his win just to humiliate her?

"Almost forgot!" He said. "You will have to do it while wearing this!"

Out of his closet, the boy procured a set of clothes still on a hanger.

A short, plaid dark skirt with a tiny white apron with frills at the front, and a short top with spaghetti straps of the same color as the skirt.

A maid uniform.

A sexy maid uniform.

The surface of the Sun was cooler than her face at the moment and Mars was jealous of the healthy red color that her face displayed. This couldn't be real, Yuya couldn't truly be asking her to wear such scanty clothing while serving him! That would be so... so...

"Humiliating? Perverted? Hot?" She was having trouble picking the exact words to use or the feelings that bubbled inside of her. Finally, she asked, "Why do you want me to wear such a thing?"

Yuya cocked his head to the side. "Is it weird?" Asked the boy. "Just thought it would be fun to dress up and act a little, ya know, to help you get into it a bit. That and... Well, I was always curious how it would feel to have a maid. Ah, you don't have to call me master though!"

Serena should have gotten out the door the moment the costume was revealed, but she didn't, she looked at the sheepish smile on the boy's face and how cute he was when he smiled.

With a sigh and a blush, she grabbed the clothes. "If you tell anyone about this, I will kill you."

"I'll be quiet as a grave!"

Ignoring his excitement, the embarrassed soon-to-be maid briskly went inside the bathroom and locked the door behind her. A few silent minutes passed but eventually, the door swung open to reveal...

"How is it?" I didn't know your sizes so I had to... to... Woah..." No one could blame Yuya for running out of words to describe the sight before him.

Puberty has been more than generous with Serena's development in regards to her body.

Long legs that widened up to a plump set of soft-looking thighs in full display thanks to the length of the skirt.

An ass that could be seen even from the front and that made all the men, and many women, turn around in awe of its size and slight bounce as she walked past. It was all but a miracle the skirt managed to hide her panties, a small break for the duelist.

Over a slim waist rested the two mountains of flesh she called tits. Enormous globes that defied gravity even without the help of a bra, which she clearly wasn't wearing at the moment thanks to how much cleavage the small top provided. And in retaliation for it, Serena's breast seemed determined to push the fabric forward until the outline of her nipples was visible.

Right now, Serena looked like a maid out of a cheap porn flick thanks to her attire and hot as hell body. All except for her face, a big angry scowl directed at the boy in front of her as she pulled the front of her skirt down.

"You planned this, disgusting pervert!" She spat at him, face completely red.

Yuya took a second to defend himself from the accusation, he had problems looking at the girl in the eyes for some reason. "I-I swear on my deck that's not true! I didn't know your sizes so I just got the medium one, you have to believe me!"

The girl's eyes gleamed with danger as she judged his words and face, searching for any sign of lies. She didn't find any, just a very flustered boy who didn't know where to look. By all means, she should go back inside to change into her regular clothes before leaving the room and never come back.

But she saw Yuya's face when she came from the bathroom. How his eyes went wide with surprise before he looked her up and down, committing to memory every curve and inch of flesh visible. It was the first time he looked at her like that. Not like a friend but as a sexy woman.

Serena loved it.

"Whatever." She crossed her arms under the heavy bust, making it look even bigger. "Just sit down over there and don't get in the way while I work."

The girl found it amusing how Yuya's jaw dropped in disbelief, he was expecting her to leave too but today was a surprising day for both of them. Still confused, the boy made his way to the chair of his desk and sat down as Serena got to work.

Serena gave a glance at the duster that came with the sexy costume before tossing it aside on the bed, she still had a bit of pride left. The girl in scanty clothes that looked out of the wet dream of a horny boy worked diligently on her task. She picked up the clean clothes scattered around the place, folded them, and put them in one of the drawers. Her cheeks went red when she found Yuya's underwear drawer by accident.

But besides that small hiccup, nothing else happened and the minutes passed. Why did Serena feel disappointed? Shaking her head, the girl bent over to pick up a sock from the floor, her eyes glancing at the full mirror in front of her. Her hand froze an inch away from the discarded sock. There, on the surface of the mirror, she could see Yuya looking directly at her ass.

Bent over like she was and wearing such a short skirt, it was no doubt the boy was getting a full show of her white panties and an impressive ass. His eyes were wide as saucers and the boy was leaning forward ever-so-slightly to get a better look at the full moons. He didn't realize Serena wasn't moving.

A strange warmth spread through her body once again, once again he was looking at her with such amazement and lust. Her heartbeat in her chest was akin to a drum and she gave her hips a small wiggle without thinking. Serena smiled at how Yuya followed her ass like a hypnotized snake.

An idea popped in her mind and she slowly straightened herself. She wanted more of that feeling and she knew how to get it.

The boy snapped back to reality once Serena turned back. Her hands rested on her wide hips as she spoke with a sweet voice. "I'm done cleaning, master. Shall I move on to my next task?"

Oh, the face he made when Serena called him master, and much more importantly, the way the bulge in his pants twitched. Serena had never been wetter in her life as she imagined the size of the monster those poor pants held captive. Caution and shame flew through the window and she made sure to shake her hips in an exaggerated way as she walked to the sound system in the room and put on a song.

She wasn't picky, the maid just needed a good beat to start the show that would change their relationship forever. Said beat blasted from the speaker and Serena made her way back to the boy who was equally stunned and excited, and with a final look, Serena turned around and did something she never thought possible for her.

She twerked her round bubble-butt inches away from her crush's face.

As much as Serena considered herself a proper and serious person, she was still flesh, blood, and hormones like anyone else her age, and so, was interested in sex and ways to catch the eye of the boy of her dreams. Twerking was one of her many research topics but she determined it was too vulgar for someone like Yuya.

She looked over her shoulder and was more than pleased to see how wrong she was. The duelist boy didn't lose a single detail of the way Serena's hips threw her ass back, the way they clapped loudly with the roll of her hips couldn't be fully covered by the music and his hungry gaze only made her go harder.

She wanted to push him to the edge.

Serena's massive cheeks devoured her tiny, wet panties as she twerked to the beat of the music, her perfect round ass clapped in the most obscene way possible and its jiggle was enough to make lesser men ruin their pants after witnessing it for too long. But Yuya wasn't one of those men, he was a true stud if the bulge going down the length of his pants was any proof of his virility.

Just a final push. "Please, master, don't hold back. I'm yours... to please you in any way you desire~"

The words managed to snap him off from the hypnosis of her twerking and back to reality long enough to look at her face, then back to her shaking booty. But this time, his face was different. Full of determination.

When Yuya stood back up, his crotch pressed against her cheeks which caused him to grunt and her to roll her hips harder. He looked at her and lifted a hand. "You... you slut!" The hand landed on one of her oversized cheeks like lighting and the slap echoed across the room like thunder.

Fitting, because Serna felt a jolt of electricity course through her until it struck her brain. "Y-yes! I'm your slut!" She moaned without thinking.

More spanks fell on her ass like rain over the earth and each time she moaned and clapped her cheeks for him. But it wasn't enough, the two of them knew but Yuya was the first to move. Hastily, he undid his tight pants and Serena could feel his sheer girth landing between her booty. The girl didn't see it directly, busy with her obscene dance as she was but she didn't need to.

The way it spread her cheeks without effort, the warmth radiating from it, the way it twitched, the sheer girth of it... Every detail was already burned in her mind, and her knees trembled. If such a thing went inside of her... What would happen to her?

Her hesitation was for naught, Serena wasn't in control of the situation, her master was. His hands grabbed her waist in an iron grip and jolted her awake, her panties lying around her ankles. When did that happen? Not only that but she felt something hot rubbing her moist, lower lips. That was bad, she was too sensitive and-

Yuya slammed his whole length inside of her with a single thrust and Serena's mind crumbled.

The girl's howl of pleasure filled the room. Her body, unable to control the orgasm ravaging it, trembled and her love juices squirted all over both of their legs, and on the mirror, her shameful expression was reflected for them to see. Her eyes crossed and her tongue lolled out of her mouth.

Yuya broke her with a single thrust of his amazing cock, which was still resting inside of her pussy, stretching it just by being inside.

But she couldn't rest yet, not while his master had yet to relieve himself. The girl gathered the shards of her broken mind and shook her ass one last time. "M-my body, my mind, and my heart. Everything belongs to you..."

His pussy tightened around his manly rod, hugging it like a clingy lover but couldn't stop Yuya from reeling his hips back until only his tip remained inside of her. The next thrust was as strong as the first one and if not for the boy's grip on her hips, Serena wouldn't be able to stand while pleasure filled her to the brim. He repeated the action, each time a bit faster, a bit harder until the sound of his hips slamming on her fat ass and the girl's moans were louder than the song that still played in the room.

Yuya's hips were a blur, his skin gleaming with perspiration, and the way he grunted with effort. He was the prime image of a stud dominating his woman. A new side of him that he fell madly in love with.

Somehow, Yuya went even faster, changing his posture so he was now hugging her from behind and kneading her soft tits with his dexterous hands. Another part of her he owned without effort.

Some part of Serena knew what was about to happen, a primal part of her mind that hungered for the man's seed, that desired to be filled by him. That part knew he was about to cum.

Serena's mouth opened to do something else besides moaning his name, she was about to beg him to creampie her besides she was silenced by a kiss. Yuya didn't need her permission to cum inside of her, as his maid, he could do whatever he wanted, like dominating her tongue with his own.

Finally, with a thrust that made his cock penetrate her deepest chamber, Yuya came. His balls tightened with great power as a torrent of virile, steamy cum flooded her womb and pushed the thick maid towards another mind-melting climax. They stood in that same position for a full minute, moaning into each other's mouths while he filled her to the point part of his seed broke the seal of his member and trickled to the floor and she kept squirting and rolling her eyes. Their fluids mixed on the floor just like their hearts did.

Yuya's balls eventually took a break to refill themselves and with a clearer head, the duelist boy gently placed the maid on his bed. He took a step back to take in what just had happened and to observe the fruits of his job; a semi-conscious maid with a pussy full of his cum and a satisfied smile. Her heavy chest heaving as she muttered nonsense and her gaze drifted...

xXx

A head full of indigo hair tied into a ponytail rhythmically bobbed up and down between Yuya's legs. Plump, soft lips hugging the thick piece of meat resting on his crotch with nothing but love and adoration for his master.

The girl took about ten minutes to recover consciousness and the moment she came to be, she squatted before him and begged to serve him further.

Now there was Yuya, sitting at the edge of his bed while his sexy friend gave him a sloppy blowjob and looked at him with love in her eyes. And she loved her back, how could he not after what just happened.

Serena awakened something inside of him and it wasn't going back to sleep anytime soon. Yuya was determined to ask her to be his girlfriend after the seven days were done and she wasn't obligated to follow his order.

In the meantime? Well... He still had six days to use the thick, sexy maid as he saw fit.

Yuya felt himself get harder inside her mouth, a smirk on his face.

"The fun has just begun!"