King would never admit it, but he was infatuated with you. Not that he needed to admit it, everyone could tell from how he treated you. And by that they mean without contempt like he does with everyone else who isn't Kaido. The only person who didn't know was you, but only because you suck at reading social cues. While while occasionally inconvenient it was one thing about you, that he found endearing about you. However, one of his least favorite things about you was your height. You were around average height of a human, so he towered over you. Meaning he could never truly be physically intimate with you as a man, which frustrated him to no end but didn't stop him from wanting to be with you.
It was almost love at first sight for King when he saw you the first time. You had joined under a subordinate captain, and were taking a tour of Onigashima when he laid eyes on you. He had no idea who you were, and he didn't know what drew you to him, but he pulled a few strings to get you working under him as his assistant. You were responsible for keeping him on track, managing his schedule, and anything he asked. Much to King's pleasure, you proved yourself to be a valuable asset to his work. You even kept his office presentable, from replacing the floorboards he regularly scorches, to dusting the floor to ceiling shelves of his book case. The latter always puzzled him because he never saw you getting the ladders to get up there.
King never bothered to ask you how you managed it because he was too busy trying his hardest to get closer to you. He wanted to know everything about you. Your mere presence engendered a peace in him that he had never felt that made him content just to be around you. You were the kindest person he had ever met, and he loved your indomitable spirit that refused to let anyone kill said kindness or change you as a person. The intriguing thing about you is there were whispers that you had a devil fruit, but no one, not even your captain knew what it did. And you refused to reveal or use it, not even Kaido could get you to change your mind. Which intimidated most members of the crew since no one knew for sure what you were capable of.
The was until late one night King had gotten into a fight with Queen and the scuffle resulted in both of them destroying part of the crew's dorms, including yours, with all of your stuff with it. In fact, it was he, who wrecked your stuff, because it was all burnt to a crisp. King had caught sight of you during the fight, and he was surprised to see the look of rage in your eyes. After the fight King approached you to apologize.
"I will pay for everything to be replaced, and arrange for new sleeping quarters while yours are being rebuilt. I'll also pull some strings to let you have design input for your new quarters."
King grew nervous when you just gave him a hard glare and crossed your arms, while tapping your foot.
"I really didn't mean to.... It was just some stuff, please."
"Just some stuff!" You shrieked, "You have no idea what you've done!"
"Don't you think you're overreacting? Queen started the fight anyway," He huffed, trying to deflect the blame and your ire.
Out of nowhere you grew in size, becoming tall enough to look him in the eyes. You pointed a finger in his face and yelled, "You destroyed the only things I had left of my family King. My photo album was a pile of ash! I'm now going to forget what they looked like because of you. You boiled my rock collection, burned my book collection, sat on my glasses, and torched all of my clothes! You destroyed everything I owned, I have every right to be upset with you King!"
Your growth spurt shocked everyone in the room into silence, and half of the crew was watching you chew him out. King lowered his voice to show sincerity when he asked, "I had no idea, I'm so sorry. What can I do to make things right between us?"
King watched your rage and anger deflate, leaving behind exhaustion and sorrow. Guilt filled the Lunarian upon hearing the tone at which you replied, "... I don't know, I'm too tired and angry to think. I just want to be alone and to go to sleep."
King placed his hands on your shoulders and offered, "You can sleep in my bed if you would like, I'll take the couch." King knew how much you preferred your privacy, and there was nowhere in Onigshima that was more private than his room.
"I can't take your bed King, I'll just sleep on the couch in your office~" You started to pull away, while avoiding eye contact with him.
But King interrupted, "Yes you can, I just had clean sheets put on this afternoon. I also insist you take my bed for the night, because last time you slept on the couch in my office you messed up your back. I cannot have you out of service for a week like last time." Leaving no room for argument, he turned you around to lead you to to his quarters.
"You're shaking," you noted once the two of you were down the hall and out of earshot of the others.
King was admittedly excited because now not only did he know intimacy was possible. But he now had the opportunity to prove to you that he was boyfriend material. He excused himself, "I've never had a sleepover before... I'll have someone find you some pajamas and clothes for you to wear tomorrow." He'd rather look childish than like a creep.
"This isn't a sleepover.... Wait you've never had a sleepover before? How?"
King sighed, "I had an... unorthodox childhood, very isolated. But I know you probably don't have the energy for an actual sleepover, this is the closest I've ever gotten to one." He smiled when he heard to mumble in agreement but that perhaps tomorrow night the two of you could have a proper one.
In his quarters he left you alone to unwind while he went to call the tailor to get you some clothes to wear while he has a new wardrobe made for you. Upon his return he found you face down, half on and half off his bed, sound asleep. He watched you while mulling over his thoughts, there's a part of him that's scared of getting hurt again. That you'll turn him into the government for the reward money. But he knew you wouldn't, you had always expressed extreme disdain for the world nobles and their systems of power. However, that did not mean that he didn't trust you with his secret. Once he decided he would take this disaster he caused, and use it to open up to you. King moved to your bedside, took a seat and removed your shoes. After depositing them neatly beside the nightstand he picked you up tenderly and tucked you into his bed. The tall man took a moment to brush your hair out of your face, admiring your soft features, before he leaned in and kisses your forehead. His breath fanned over your skin as he mumbled, "Good night, and sweet dream dreams."