A/N: Yo, everybody. Yep, this is my fourth story, but compared to the others it will be a harem one. This story's idea comes from another writer, and as the title and the summary suggest, Fuutarou will be very different. All that said, let's go!
'Where the heck am I?', thought the young man known Uesugi Fuutarou while observing the place he was in.
All around him was dark, with a series of eerie violet flames that looked to form a circle.
"Nice to meet you, lucky man.", suddenly said an unfamiliar voice that seemed to ce from above the boy's head.
He looked up to see something that scared him: a freaking humanoid creature with horns, claws, a pointed tail and bat wings was flying above him!
"Aaaaah! Get me out of this nightmare!", shouted the boy, starting to freak out until the creature started laughing.
"Hahahaha, calm down, boy. I'm not going to hurt you."
"W-who the hell are you?! And what is this place?!", were the loud 9 launched by a little calmer Fuutarou.
"We're obviously inside your dream, and my name's Mephistopheles, the Demon King of Hell.", replied the creature, making the boy's golden eyes widen.
"D-Demon King? Mephistopheles?! So you demons from demonology are real?"
"Oho, it looks that someone knows a little about us. Well, I guess it's expected from a smartass like you. Anyways yes, we demons are real and lived for thousands of years in Hell. Why am I, the Demon King, talking with you in your dream you may be asking yourself? Let's say that I'm here to make something good for you.", explained Mephistopheles with a grin.
Something good for me?", asked Fuutarou, raising an eyebrow.
"Simple: I'm here to make you an Incubus haha.", was the demon's reply.
And hearing that made Fuutarou gasp before blushing and shouting, "W-What?! You want to turn me into a sex demon? What for?!"
"Relax, young man. The reason why I want to turn into an Incubus is to help you; by becoming that type of demon your intelligence and physical strength will rise up just like your confidence.", said the Demon King while patting the boy's shoulder.
The idea of increasing his intelligence and his strength perked up the young man's interest, but he was doubtful. It was impossible that a creature like the Demon King would turn into a demon without something in exchange.
"Are we sure that you want to turn me into an Incubus just to help me? That there is nothing you want in exchange?"
Mephistopheles sighed before smiling, "Tsk, you worry too much, boy. I'm not how those craps of demonologits described me, so you can stay sure that I won't ask for your soul or anything else. It just a good demon that likes doing something good for the others. After all, if you want to know it, I managed to stop fights between different demons in hell after becoming the King."
'Hmm, by judging from his eyes and the way he talks he doesn't seem the type to lie. Yeah, I'm speaking of a freaking demon that has just appeared in my dream, but I got scared enough earlier. Becoming an Incubus would mean that I will stop being a human, but obtaining great advantages. It's better that I ask him this.', thought Fuutarou with a hand on his chin before looking at Mephistopheles again.
"Mephistopheles-San, if I become an Incubus, will I risk to m-make women c-come by just looking at me?", he asked him, blushing.
The demon made a surprised face before bursting out laughing and falling on the ground to hold his stomach. "Hahahaha, w-what kind of question is that?! It's hilarious!"
"J-just answer me, damn it!"
"Hahaha, no, you won't haha. An Incubus is indeed a demon that attracts women easily, but he won't provoke what you said with just his gaze. His gaze has the ability to enchant women to do what he wants while his most peculiar trait is being able to make the women he fucks his eternal lovers.", explained the demon after finishing to laugh.
"In a few words, g-girls would lust for me, right?"
"Exactly. So, what do you think? Will you accept to become an Incubus?", asked him Mephistopheles with a smirk.
After getting all what he wanted to know and due to his interest in becoming smarter and stronger, Fuutarou nodded in confirmation, making the Demon King grin again.
So Mephistopheles pointed one hand towards the boy while starting to murmur some strange words. During this, the violet flames around them went to cover Fuutarou's body, but instead of feeling like burning, the young man could feel like something was changing inside and outside of him.
"Have fun, Fuutarou!", told him the demon while feeling that his vision was slowly becoming darker…
"Ah!", exclaimed the young man, suddenly waking up. He then touched his face to see if he had some burns due to the flames, but it wasn't the case as he didn't feel anything strange.
'W-what kind of dream was that? Did I really meet a Demon King that turned me into-What a-?!', he thought, interrupting his train of thoughts when he started to touch his arms and his stomach.
He quickly got up from his futon to check himself in a mirror, and what he saw left him astonished; his arms were now very muscular, his pectorals were toned and he had also a sexy six pack.
He also felt something big inside his pants, so he gave a look to see that his junk got bigger. A sight that made him blush.
However, these changes weren't the only ones he noticed: he saw that his once golden eyes changed to purple, as if he had some kind of contact lens.
'W-woah, this is absurd... Mephistopheles-San really turned me into an Incubus. My body looks like I went to the gym who knows how many times. Still, I d-don't think I needed that to get bigger.', he thought, admiring his new body.
"Onii-chan, why did you scr-Onii-chan?!", suddenly said his little sister Raiha while entering in the room, shouting upon seeing her brother's appearance.
"Oh, good morning, Raiha. What's wrong?", he asked her while looking at her.
"What happened to you?! I don't remember that you were so muscular!", she asked him quickly.
In fact, her brother had never been so jacked like he was now, since his appearance was always normal. However, the newborn Incubus managed to tell her that he secretly trained at the gym as reason why he was completely different now.
Sure, it was a lie like the fact that his eyes were purple due to some contact lens, but he couldn't tell her that he met a nice Demon King that transformed him into a demon that seduced women. She would take him for a crazy and call a psychiatrist, even if they didn't have the money for that.
Anyways, his lie looked to have worked as Raiha smiled and told him that it was impossible now that he wouldn't find a girlfriend. So after telling him that breakfast was ready and exiting from his room, Fuutarou sighed.
'I don't like lying like this to my family, but I have no choice; now that I'm not human anymore, they would be scared of me and think that I'm a monster if I said the truth.', he thought, opening his small wardrobe to change his clothes.
Fuutarou always wore his school uniform since he started to go to Asahiyama High School, but maybe due to his new demonic nature, he decided to go for a change.
So he grabbed a short sleeved black shirt, a blue t-shirt and a pair of navy blue trousers, wearing them with the shirt kept unbuttoned to show off his muscles under the t-shirt.
After that, he exited from his room and went downstairs to join Raiha and their father Isanari for breakfast, making the blond man gasp at his son's new appearance.
Isanari then scanned him for good, noticing how his son was basically muscular like or even more than him, which made him smile while telling him that same thing Raiha said earlier about girls.
Smirking, Fuutarou joked by saying that if the girls saw the new him, they would probably ask him out immediately. Both Raiha and Isanari laughed at that while the three of them started to eat.
But during this, the young Incubus suddenly heard again Mephistopheles' voice in his head, who contacted him telepathically from Hell to ask him how he felt with his new body.
The young man said that he felt great, getting more interested in his abilities when the Demon King told him that he could fly with his demonic wings by explaining him how to take them out.
"However, be sure to use your powers with wisdom, Fuutarou. I know that you feel more confident and stronger, but don't let power get to your head, ok?", warned him Mephistopheles with a serious tone.
"Don't worry, I won't. I will use my new abilities to excel more in my studies and to help my family at my best.", was the boy's reply, making the demon smirk while he told him that he could contact him again if he needed.
After this little conversation, Fuutarou continued to enjoy the breakfast with his family until they were done and it was time to go school. So while Isanari accompanied Raiha to her elementary school, the young demon took his school bag and started to walk towards Asahiyama.
He could have tried to fly with his wings, but he preferred walking to test how much his body's limits changed, grinning for seeing how his stamina got a huge boost. It was like the fatigue was something unknown to him now.
So, after taking like 10 minutes, Fuutarou arrived to Asahiyama, quickly getting the attention of all the students because of his change.
"W-who's that guy? Do you know him?", asked a boy to a girl.
"O-oh my gosh! That's Uesugi Fuutarou!", she shouted.
"W-what?! The top student of our school? Since when was he so jacked?!", exclaimed another guy.
"I-I don't know, but I like what I see.", said another girl, blushing and smiling at the sight of Fuutarou. Said boy noticed her gaze and winked at her, making her and other girls blush deeper while the guys felt jealous.
'These girls are already getting attracted to me after only seeing my new attire. And following what Mephi-San told me, those that have sex with me will be my lovers forever. Basically, it's like I will get an harem.', he thought, chuckling while referring to the Demon King with the nickname that he told. me to use, since it was easier to pronounce.
Then Fuutarou continued to walk until he entered inside the building, attracting other looks from other girls accompanied by blushes and drooling. But suddenly, he bumped into someone, flinching slightly while the other person felt.
"Ow, that hurt. You should watch where-?!", started to say a female voice before cutting herself off.
The young man looked down to see a beautiful girl with mid long red hair and ocean blue eyes, who was wearing a black and white school uniform and blue headphones as accessory. And just like the other girls, she had a huge blush on her face.
"Oh, sorry. I was distracted while thinking about something. Are you ok?", he asked her while offering his hand.
Shyly, she took it and got up while looking down and blushing more. "I-I'm fine, t-thanks."
"Your uniform is like the ones from Kurobara. Are you a new student?"
"Y-yeah, I-I transferred today from Kurobara. The principal t-told me to search f-for the 2-A class.", she told him, still blushing and unable to look at him in the eyes.
"2-A? That's my class! Do you want me to get there together, mm-"
"M-Miku. My name's Nakano Miku. And Y-yeah, I'd like it mm-"
The boy smiled while still holding her hand, "Fuutarou. My name's Uesugi Fuutarou. Nice to meet you, Miku."
Finally, she lifted her gaze to meet his beautiful violet eyes, getting more flustered while she felt some kind of big attraction to him.
'W-what's this…I-I've just met this boy and c-can't help but feeling so attracted to him and wanting to hug him and k-Nooo! Bad thoughts!', she thought, having some steam coming out of her ears for imagining to kiss him.
This didn't pass unobserved to the boy's eyes, making him blush and smile; it looks that his charm was more dangerous when the distance was shorter, increasing the lust of the girls more easily.
Still, since he didn't want to arrive late to class, he started to walk while holding Miku's hand, telling her to hold tight to not get lost.
That made her pout because she felt treated like a kid, but that gorgeous smile of his managed to make her blush again while she tightened her hold on his hand.
The other students were shocked to see the famous top student holding hands like that with the new student, with the girls frowning or pouting in jealousy as they desired to be in Miku's place.
And this went on like this until the two teenagers reached their class, with all the Fuutarou's classmates and baldy homeroom teacher getting shocked before his new aspect. Without forgetting the fact that he and the transferred student were holding hands like lovers!
"U-Uesugi-kun? Is that really you?", asked him his teacher.
"Hmm? Of course, Sensei. I just hit the gym way too often.", replied the young demon with a grin.
"O-oh, I see. And you also accompanied new student to our class. That's very nice of you."
Fuutarou just continued to smile, glancing at Miku and making her blush and look away. His amethyst like eyes were so attractive that she would stare at them all the day if she looked at them.
Anyways, the top student left her hand and went to sit to his desk, with Miku frowning as she wanted to hold his hand a little more. Nevertheless, she presented herself to the class, with a lot of boys and girls welcoming her warmly. And as if she was lucky, she saw that there was a void seat at Fuutarou's left, so she didn't think twice about sitting there.
"P-please, take care of me, F-Fuutarou.", she told him bashfully.
"Count on me, Miku. Just be careful to not bump into other people.", he told her teasingly, making her blush again and pout.
'U-Uesugi-kun is such a hottie!', thought the other girls meanwhile, looking at him and admiring how sexy he was. And like at the school entrance, he could feel those gazes upon him.
'It's like Dad's high school life, with the difference that I'm a demon that seduces women and I'm not an idiot like him.', he thought, chuckling internally at the funny episodes that Isanari told him often in the past about his school life.
The black haired boy also noticed that Miku didn't have any textbook to follow the lesson, so he didn't think twice before joining their desks and letting her look at his book.
This action caused her to blush a storm as her shoulder was touching his, but she mumbled a shy "Thank you" anyways. In response, he smirked and caressed her hair without looking embarrassed at all, catching her by surprise again while her heart started to beat faster.
'I m-met him only some minutes ago and he did nothing but making me all flustered with his actions. A-and I liked holding his hand just like I'm loving his headpat. I-Is this what they call as love at first sight?', she thought, blushing more while feeling the need to envelope him in a hug.
On the other hand, the young man was pretty calm, not showing any sign of embarrassment. He guessed that due to his new nature as Incubus, he wasn't affected anymore by the common embarrassment that a teenager boy could feel whenever he was very close to a cute girl for example.
And speaking of cute, Miku was indeed a very beautiful girl, making her look as the most gorgeous one in the school to Fuutarou's eyes. Her eyes and the color of her hair also looked quite familiar for him; as if they reminded him of someone he met in the past.
When the two first lessons ended and it was time for lunch break, the top student got immediately surrounded by his classmates that started to ask him which gym he went to and what happened to his eyes. Obviously, it was more the girls that made the questions, looking at him with sweet eyes.
But since he was hungry and lunch break never lasted very much, he answered to their questions in the same way he did with Raiha, asking Miku if she'd like to have lunch together.
The girl's eyes widened and she blushed at that, accepting anyways to avoid the storm of questions that some classmates were throwing at her. So Fuutarou took her hand again and they got out of their classroom to reach the cafeteria.
The two of them then started to talk during the way to know each other better, with the headphones girl telling him that she was the third sister of a group of quintuplets and that her sisters would come to Asahiyama too from next day.
"You have 4 identical sisters? That's incredible.", he said, finding it amazing.
"Y-yeah, but we have different hairstyles and accessories. S-so it will be easier to distinguish them when you meet them. I-I met you only two hours ago, but you're already a friend for me.", she told him with a nervous smile.
Fuutarou was stunned at how she already saw him like that, but considering how nice and straightforward he was with his lovely gestures, he kinda expected it. So he told her that he looked forward to meet her sisters, making Miku smile brighter.
The two of them then finally reached the cafeteria, where they took their lunch trays and sat down together to a table. Miku took a look at Fuutarou's tray to see that it wasn't enough for a big guy like him, so she asked him if he'd like a piece of her sandwich.
He assured her that he was fine, telling her to enjoy her lunch while he'd do the same with his. She smiled at him and complied, beginning to eat like he did.
However, both she and the boy could hear that the other students were talking about them, saying that they were already a sweet couple . And hearing that made the shy girl blush a storm and fidget.
'T-they see me and F-Fuutarou as a couple?! I already like him and he's nice and handsome, but I-I still met only some hours ago! Is he annoyed by-?!', she thought, widening her eyes when she glanced at Fuutarou that continued to eat calmly.
He noticed her glance, so he looked directly in her ocean eyes and smiled at her, giving her the idea that he liked what he heard. And that made Miku's heartrate go faster another time, making her like her new school life even more.
And after lunch break ended, she and Fuutarou went back to class and followed the rest of the lessons in the same way of the morning, with her smiling blissfully for being so close to him and the boys glaring at Fuutarou in jealousy.
Miku also asked him if he could accompany her to home later, blushing a storm for her sudden audacity. Such question surprised him a bit, but he accepted as he didn't mind, making some students that heard them gasp.
'First he becomes a hottie and then he gets along so well with the new student like they were lovers?! Mouu, I'm so jealous of Nakano-San!', thought the girls, wishing to be in Miku's place.
And when even the last lesson ended, they frowned at seeing Fuutarou walking with Miku and holding her hand again while the boys felt envious of him. Still, the girls blushed when he turned around and greeted them, with them doing the same.
He and Miku then left the school building and were now walking towards her home, with her not letting go of his hand either once.
'D-did I get lucky by any chance? It's been my first day at Asahiyama and I've already met a handsome, smart and nice boy…And now he's t-taking me h-home while holding my hand!', she thought, smiling happily for all that happened until now.
"You know, you should smile more often.", suddenly told her the hot demon.
"Eh? W-what do you mean?"
"I mean that I like it when you smile. I find it beautiful.", he replied, glancing at her with those dangerous violet eyes of his.
And hearing that compliment caused Miku to become red as a tomato, with some steam coming out her ears; did he just say that her smile was beautiful? He'd make her want to hug him if he continued to make her heart skip a beat like that!
Anyways, she managed to mumble a shy "Thank you, Fuutarou", getting a grin from him in return. They continued to walk together for some other minutes, finally arriving to an enormous apartment complex in the richest area of Tokai: the Pentagon. A sight that made Fuutarou stunned.
"W-Wow, you live in this building, Miku?", he asked her.
"Y-yes, I live in a big apartment with my sisters on t-the last floor. I'd l-like to invite you for some tea for all that you did for me today, but I-I'm not sure if my sisters would be fine with that.", she replied, smiling nervously and fidgeting.
"Oh, that's ok. Helping a silly clumsy girl like you was like a duty for me haha.", he told her, chuckling while she pouted.
But then she closed her eyes and lifted her heels to reach his face and plant a kiss on his cheek, catching him by surprise and making him blush.
After that, she got immediately flustered and looked down embarassed. "T-That was t-to thank you for all you've done for me. S-see you tomorrow, Fuutarou!", she told him, nervously and stuttering.
"Oh, you're welcome. See you, Miku.", he replied while he was touching the spot she had kissed.
Miku then bowed her head to him and went inside the building, still flushed for the bold move she had just made.
On the other hand, the young Incubus was smiling; he didn't expect her to give him a kiss on the cheek already, but maybe it was inevitable as his looks and his new attitude of Incubus attracted her more and more. Plus, Raiha and his father would beam once he told them how his school day went.
'Everything seems still surreal, but I'm liking already this new life as an Incubus. Miku also told me that her sisters will started to attend Asahiyama from tomorrow; I'm curious if she will tell them about the kiss she gave me haha. For now I will just go home since I want to study.', he thought, chuckling while recalling everything that happened and searching for a blind alley.
Once he found it and made sure to have no one around, he tried to spread his wings like Mephi explained him to do. So he closed his eyes and concentrated, and after a minute or two, a pair of black and purple bat wings came out from his back.
He took a look at them and grinned, starting to flap them to take the flight in the air. And when he reached a considerable height, he began to fly in direction of his house while the wind blew on his face.
It was the first time that he flew, and he was doing it with a pair of demonic wings that he gained by becoming a sex demon thanks to a weird but nice Demon King.
He'd lie if he told somebody that he wasn't amazed at all before all these changes in his life; a life that promised to be very particular from now on. And maybe it would be it more when he'd meet the rest of the Nakano sisters, but only the next day would confirm it. And the handsome demon looked forward to that.