disclaimer: i do not own one piece
Demon AUin the prestigious school named the Reverie academy where the richest and some troublesome people attend the more popular girls of the school are a group of long-life best friends that includes: Sarie Nantokanette, Kinderella, Komane, Mororon and Ban Dedessinnée; they are the most popular in the school because of their beauty, their charismatic behavior and intelligence so they are called the Queens. all of them alongside the other students have listen to story of the demon king that has been looking all over the city for the woman that will his queen, of course most of them think that the legend is farce to scare the women from all around the city, but the Queens decide to see if that is true or just a fairy tale before graduating.
when the weekend came the Queens while being in Komane's house prepare everything to do the ritual to summon the demon king by using an ancient game that has been used to contact the spirits and in some occasion demon from hell itself: the Ouija. all of them have a task that they will do while the spiritual session is going: Sarie will be the one summoning the demon, Ban will be the one writing every word that the demon spell with the Ouija, Kinderella will be the one recording the session and Mororon and Komane will the ones talking in turns to the demon.
when everything was ready the session started at midnight and after saying the magic chant to summon the demon the Queens waited for a couple of minutes until they were able to get in contact with the demon, but what they didn't expect is that from the Ouija will appear a dark smoke that will take the appearance of a demon that look at them with interest while they were looking at it with a mix of fear and excitement. during the whole session the demon answer each question that Queens made to him with the honesty they deserved until he asks them two simple questions which were answer with the same honesty, he has given them during the session, having his questions answer the demon disappear after promising to them that they will meet again.
a week after that session of spiritism in the Reverie academy while the Queens were gossiping with their classmates the homeroom teacher came to the classroom and before starting the class, he made an announcement of a new student: this student was a handsome man with dark shaggy hair, red eyes, and a scar under his left eye. this man brought to himself lovely looks from the female students and some death glares from the male students, but he didn't mind them because he was paying attention to the Queens. he presented himself as Monkey D. Luffy and wanted to have a great time with everybody.
the days passed and the new student prove to be quite an interesting fellow because not only he was handsome, but he also was so smart and athletic that even the most difficult test was a child play to him, so strong that he could take the toughest criminals from the school with ease, but his greatest fit was his kindness that gain him the loyalty of many people and earn him the nickname of the king. on the other he was called by another nickname that was use by those who dare hurt his friends and in return he shows them his merciless side that earn him the nickname of the dark king, but no one could explain the reason behind that name.
during Luffy's stay in the academy the Queens started to develop feelings for him so strong that Sarie and Kinderella have break up with their boyfriends without any kind of remorse, but the problem was that none of them couldn't confess their feelings for him without affecting the others, so they decide to confess their feelings for him all together. when they did confess their feelings for him, he surprisingly reciprocated all of them and tell them to wait until the graduation party so could marry all of them a request, they all agreed.
for the next month until the graduation they were doing all the things a normal would do spending time together, chatting whatever they feel like, feeding each other and so more things. when the moment to graduate came the Queens decided to go with their most dresses (that will the dresses they normally use on one piece), but before they could even go to the school, they were kidnapped by Sterry and Wapol (Sarie and Kinderella's ex-boyfriends) and some other more because they wanted the Queens to pay for breaking up and rejecting them in the past.
the Queens were retained in an old warehouse near the sea where they were offered to get away unharmed from that situation: kill Monkey D. Luffy and accept their captor as their lovers. it was simple demand they could not reject if wanting to keep living, but the Queens rejected the offer by saying how amazing Luffy was that the Queens compare him to their captors to be lot better than them.
the captors were infuriated with being compare to a "commoner" that they couldn't care less of what would happen to their hostages, but before they could something the gate of the warehouse was break with a kick that was delivered by Luffy who was angry as hell. Luffy said that he was worried to not see the Queens in the graduation party but now he understands the reason of it, and it make so furious that his appearance changes to a demonic one, the Queens finally understand who Luffy really was: he was the demon king they summon.
Luffy decides to take care of Sterry, Wapol and their minion in cruel way before releasing the Queens, the "battle" was done in a matter of few seconds. after the battle Luffy release the Queens and with a snapped of his fingers all of them were transported to Luffy's manor. in the manor Luffy explain the situation to the Queens by revealing who he really was he was Monkey D. Luffy the demon king from the legend, that he has been looking for the woman share the eternity and he found the women who he would like to share it. after the explanation he asks the Queens if they still love him even though they know his secret, the Queens accepted Luffy for he was and wanted to prove him how they care for him.
Lemon scene
the next morning Luffy hold out a graduation party in his house and a wedding as well that everybody that was loyal to him was invited. Luffy and his queens spend the eternity together show towards each other a passionate kind of love.
