Readers pov

It was another lunch break as me and the others were sitting a top a hill for lunch. I thought that I maybe proficient in magic what about my physical capabilities I need to build muscle. "Ban." I said looking at him. "Hmm what is it boss." Ban said looking at me. "Think you can help me with my physical capabilities." I said looking at him. "Why didn't you ask boss we can do a little spar right now." Ban said getting up. "Wait we're still in school grounds." Kaori said.

"Don't worry kaori we won't go to far." Ban said as I nodded. "Let's go over the basics your form is what is most important." Ban said as I got into a stance. He soon taught me on how I should throw my punches aim for the center of mass. "You also want to build muscle right." Ban said. "Yes I do my frame is a bit average." I said. "Do you have anything that could help with training at home." Ban said. "Actually there is a facility in the basement a time chamber to be exact but I haven't used it in a while." I said. "We'll start training tonight to help you build that physique." Ban said. "I also wanted to question Ban how did you get into this school." Sakura said. "Yeah you look like your in your late 20s." Sakura said. "(Y/n) was able to get me to become the home Ed teacher and I'm able to make any dishes I want." Ban said. "He was an instant favorite among the female students due to his cooking." I said. "Now try to punch me with what I taught you at least." Ban said leaving himself open. "Alright then." I said. "Also don't hold back either." Ban said as I nodded as I reeled my fist back and aimed for the center of mass.

"Agh." Ban coughing saliva feeling the wind knocked out of him. "Not bad boss that was a pretty good punch for someone of your caliber. But there still room for improvement." Ban said as I stood back. "Maybe we'll a new (y/n) after he's done with his physical training." Kurumi said. "A new (y/n)." Kaori said thinking about what kurumi meant as her face went read. "Kaori your face is red." Yuki said. "Ahh sorry." Kaori said as she covered her face. "Seems someone's embarrassed." Kurumi giggled. "Alright everyone seems lunch breaks about to end." I said as everyone nodded as we began to walk down the hill.

-Timeskip-

I was heading down into the basement where Ban was waiting for me there. "Hey boss so this the door." Ban said waving at me. "Yeah it is and Ban why do you call me boss." I said opening the door. He shrugged as walked through coming into the hyberbolic time chamber.

"So how does this place work boss." Ban said setting down some weights. "From what father has told me one hour in here is the equivalent to ten minutes in the really world." I said. "Also how are we able to back to the house." Ban said. "Simple my house is connected to the time chamber we don't need to use the door since we can teleport through my magic circle." I said taking off my shirt. "Yeah your right boss you are fragile almost like I can break you in two." Ban said. "Yeah this is why I asked for training." I said putting on some arm and leg weights. "Alright shall we begin with training boss im gonna mold you into the strongest king." Ban said as I nodded.

Ban pov

"Let's begin with sparring." I said as boss nodded and I got into a position. We both jumped and began to start fighting throwing punches seeing that I have the advantage in physical strength but boss has the advantage in magic. "Ora." Boss said punching me in the face making me skid back. "Hehe not bad boss why don't we turn it up a notch." I said as he nodded.

(Ban is Meliodas and You are Zeldris while you both are smirking)

The stare down between me and boss as both our aura's were leaking out. "Let's go Ban." Boss said it made me smile. "Don't have to tell me twice boss." I said as we both went in colliding fists and blocking each others attacks. "Try to incorporate kicks as well fighting doesn't mostly involve your fists your whole body is a weapon." I said while talking in our fight. He then threw kicks into his mix of attacks even with the weights on his arms and legs it feels like he is putting force into them. We both were breathing in heavily neither one of us were about to go out. "No holds barred." Boss said simply taking his weights off. "I thought we were." I said smirking. The aura of boss feels like he's about to rise into something new. "Now let's go." I said as I saw (y/n) do a flying kick as I grabbed his leg throwing him over and onto the ground. "Time to bring the heat." He said.

I jumped back seeing that the flames (y/n) incorporated into his attack are not at normal temperature there almost hot as escanors sun. 'The fire in bosses eyes are that to seek improvement and that same flame eye I saw yesterday.' I thought looking at that blue flame in bosses right eye.

"Let's go Ban." Boss said as we both began to fight at our hardest. His punches became even harder now with the weights off from our first fight a few minutes could it be that the flame in his eye increases his strength and the meditation his blows are more precise combining his Phoenix flame with physical attacks.

'If let this up I'll be put at a disadvantage.' I thought to my self as I threw my hand out. "Snatch." I said snatching some of (y/n)'s strength. Seeing him stumble gave me a chance as I threw an uppercut launching into the air. I jumped up and slammed him down into the ground. 'That should do it.' I thought dropping down to the ground. "Hey boss you ok." I said looking into the crater. "I'm good." He said giving a shaky thumbs up." I dropped into the crater helping boss out of it. "I feel like shit ban how long have been in here." Boss said. "The fight was about a good hour so in really world time we've mostly been in here for ten minutes." I said. "Know let's do weight training to built that physique of yours." I said helping boss up to help him with his physique.

-In the real world-

Kaori pov

I was in the kitchen with Yuki helping to get dinner ready since Ban was helping (y/n) train. "Yuki-san where are Ban and (y/n)." I said while peeling the skin of the potatoes. "They are in what is called the hyperbolic time chamber it's in the basement." Yuki said. "Ahh." I said. "(Y/n) wanted me to also help you with the development of your sacred gear he said it's known as the apostle." Yuki said. "It sounds almost related to Christianity." I said. "That's because it is a sacred gear that possess great magical power and healing abilities." Yuki said. "I see." I said chopping the potatoes. "So we're making curry for dinner." I said as yuki nodded. "Judging by the time they've only been in there for a good thirty minutes." Yuki said as it was only 6 pm. "What do you mean." I said putting down the knife. "The time chamber works like a normal clock but more advanced 1 Hour in there is basically ten minutes for us." Yuki said. "They've been in there for three hours." I said as yuki nodded. "Time works differently in there (y/n) could be a whole new person once he gets out." Yuki said as the rice cooker dinged meaning that it was done as I unplugged it. "Where Sakura." I said grabbing some plates. "Sakura is doing her own training while doing normal exercises like running and doing jogs." Yuki said.

"Yuki, Kaori we're back from training." (Y/n) said walking in with big brother. "Welcome back how was trai-." I was cut off to seeing a new physical (y/n)

"Did you get taller (y/n)." Yuki said. "I don't how tall was I earlier." (Y/n) said. "About 5'7." Yuki said. "Ban is 6'11 which towers me but I feel like I'm about 5'10." (Y/n) said. "To gain a six pack that quick." I said with my nose slightly bleed. "Kaori your nose." Ban said putting tissues in them . "S-sorry." I said blushing a bit. "Anyways curry is todays dinner." Ban said. "Yeah we were about to finish up." Yuki said prepping all the dishes on the plates. "I'll go get kurumi." (Y/n) said as we all nodded as (y/n) left. "Did (y/n) ever have a relationship." I said which caught yuki off guard. "He hasn't really had a relationship or been in an arranged marriage." Yuki said which made me think of (y/n) were to be in an arranged marriage.

Readers pov

"Kurumi dinner is ready." I knocked on her door which it was silent. "I'm coming in." I said as I opened her door to see her in her bra and panties as I ran back outside. 'What the hell was that was she just teasing me or was their another motive.' I thought to myself as I saw kurumi come out of her room. "You said dinner was ready." Kurumi said. "Yeah." I said hiding my blush. "Is the great (y/n) blushing." Kurumi said poking me. "It's not like that." I said heading downstairs seeing everyone was sitting down as me and kurumi sat down last. "Thanks for the food." We all said as we began to eat.

"So boss think you'll ever get married or have a fiancé." Ban said as I choked on some of food. "Ahh (y/n)." Sakura said as she passed me some water as I drank some of it down. "Where did a subject like this come from." I said putting the glass down. "It was kaori." Ban said pointing to kaori. "Brother!!!" Kaori said. "What made you this curious kaori." I said looking at her. "You are noble like your brother and usually you would be put into an arranged marriage." Kaori said. "Like my brother this is was based on the Gremory families decision to put Rias and My brother in an arranged marriage. I wouldn't know what father and mother would if a special case like me were in a marriage." I said eating. "So marriage hasn't been on our your mind boss." Ban said. "Marriage in the devil world is to maintain good relations with the two clans seeing that it be a dire situation like what brother said for all devil kind since the Great War." I said. "Even if Lord and Lady Phoenix were to put (y/n) in an arranged marriage he has no say in it where even if his soon to be bride doesn't deny the proposal." Yuki said. "Even if I were to be put into an arranged marriage I would if there is equal ground to both parties." I said. We were all eating and talking about necessary things in our lives and how I should grow my peerage as a king. 'My peerage is more like a second family.' I thought to myself looking at everyone.

Soon or later the room glowed a feint purple as me and the others were on guard seeing two people appear from the magic circle.

"Are you (y/n) Phoenix." The one in the kimono asked. "Yes I am and who are you." I said still on guard. "I am Tsukiko Shion of the Shion household." Tsukiko said. "Tell me lady Tsukiko why are you here in my house." I asked. "I want you to marry my daughter." She said as me and the others were shocked by this sudden proposal.