Y/N POV
"C'mon Issei hurry it up" Rias called out while i just chuckle myself as Issei struggles to carry a heavy backpack while Kiba passes him wearing one thats even bigger while We pass Issei as Shirone is carrying not just Kuroka and I but also a backpack ten sizes bigger than Issei as he falls over panting.
I sigh yo myself before calling out "Issei what's your dream?" As he quickly responds "To be the Harem king!" I response formulates in my head to encourage him "If you wanna have a harem, then your going to have to be stronger, women don't like weak men!" As soon as i finished that sentence he had new found energy and blasted of leaving a trail off dust behind him. "Did you really have to encourage him?" Kuroka asks as i turn to her "As much as i don't support his dream Rias will need him as strong as possible if he's going to be the Red Dragon Emperor, plus i'm sure Vali wants him strong as well, they are rivals." She sighs knowing i'm right leaning her head on my shoulder "well you're right about one thing" she tells me "oh and what's that?" I question as she wraps her arms around mine "that women like a strong man" she finishes feel my arm.
"If you're gonna do stuff, get off my back" Shirone calls out from below us. We chuckle as in the distance the cabin comes into view with a collapsed Issei just outside the entrance.
Timeskip
As the members of the ORC line up infront of us Kuroka stands by my side "Okay, these ten days we have are going to be spend training almost non-stop. Kuroka and I will be working which each of you personally and hopefully you can get stronger and ein the rating game" i call out as they look at me with a fire in their eyes "Now Devils of the House of Gremory, welcome to your bootcamp" i call out. Observing my fight with Issei, Kiba and Akeno has given me Basic ideas of what they need training in while i don't have alot of ideas with what Asia, Rias and Shirone need training in.
Timeskip
Kuroka's POV
I'm sitting down as i stare at the aftermath that was the first day of 'Bootcamp' as Y/N calls it and suffice it to say, they got shown how much more powerful he is compared to all of them: Issei can't fight very well, always depending on the strength his boosted gear gives him but one hit while build his strength and it all goes. So Y/N tried teaching him how to fight by kicking the shit out of him till he learns to fight back. Kiba doesn't have much technique always relying on his superior speed, so when fighting someone who's as fast or faster he doesn't fair very well, so Y/N is teaching him how to fight with a sword (thanks to his training with arthur he is proficient is sword fighting). Asia is quite cowardly in a fight and has high magic reserves but can't use anything but healing magic so I am teaching her protective magic such as barriers and magic shields while also trying to raise her confidence his isn't going well.
Shirone relies on strength to much so we are trying to up her speed and reaction times but Y/N fighting her upclose while i sit back and use magic, needless to say she's quite good when using sage arts but holds back due to our past she is still hesitant to always use it. Akeno well... we found out she's quite the sadist, the hard way and therefore she isn't serious in battle so if she can hold back her tendencies she can be quite powerful. Rias isn't good at battles as she always deals the killing blow so I tried teaching her to use more various types of magic other than destruction magic as if you try to use it on someone stronger than you it doesn't work as well. While Y/N tried teaching her some hand to hand combat and that didn't work well nor did teaching her how to counter or dodge attacks. Maybe because everytime they tried Y/N would just yell out 'DODGE!' And hit her.
Asia is finishing healing Issei as we head inside to bathe Issei starts up his perverted antics "Woohoo! Mixed baths" but Shirone quickly shuts him down "There's seperated baths" she tells him as his head quickly slumps down and Y/N gives her a chocolate bar as if to say 'good job' she quickly starts to eat it. "Well i don't mind sharing, Ehat about the rest of you?" Rias asks "I don't mind~" Akeno says with a sultry tone " It's f-fine with me" Asia states as she looks away blushing "No" Shirone says as Issei's hopes are shot down once again "Sorry Issei maybe next time" Rias calls out as we head to our seperate baths
Timeskip
Y/N POV
After stopping the many, many attemps of Issei attempting to peek on the girls we head out and get changed to get ready to cook dinner. In the kitchen we meet up with the others as Kuroka quickly joins my side "Issei's not the only one disappointed with the segregated baths y'know. I would have loved to get washed by you~" she tells me as i chuckle. "Hey! What's so funny?" She questions me as she pouts slightly "we are sharing a room are we not?" I ask as she nods "then we can do 'that' without having to worry about others" i answer as a blush rises on her cheeks before she returns to her normal demeanour before kissing me on the cheek and smiling innocently. A noise pulls us out of our interaction as we see all the onions unpeeled and Issei rubbing the back of his head "well guess we're having onion soup for dinner" he says as i stare at him.
Timeskip
Kuroka and I are laying in our bed for the next ten days as she snuggles up next to me i would do the same but im currently thinking of training for tomorrow. 'Issei could do with the help of magic, perhaps using all that stored up energy can be used as an attack' i'm dragged out of my thoughts as Kuroka rolls on top of me " I know your worried about the Rating game" she tells me as she gets up slightly her hands holding my shoulders as i now look up at her. "But worrying will do you no good, and if they lose you can always crash the wedding" she finishes as a smile crosses my face "you always know what to say" i inform her as she smile as well, we stare into each others eyes for 20 seconds as a comfortable silence fills our room before she leans in and kisses me on the lips. I'm shocked at first but melt into ot as we break apart a blush adorned on both of our faces she rests her head on my chest.
"At first i saw you as someone who was strong and could help me repopulate my race" i tells me as i'm shocked that she wanted to use me like Rias did "but the more time we spent together, the more my ferling towards you developed." She finishes as i wrap my arms around her "I may not be experienced with women nor do i have the confidence for what i want to say, but you do know what i want to say don't you?" I ask her as she nods in my chest as she starts to purr as we fall asleep together.
Timeskip
I walk out my room with Kuroka wrapped around my arm as Issei charges towards us "How the hell are you so damn lucky?" He questions as i gain a look of confusion "what do you mean?" I ask as as he quickly responds "Not only do you get to Sleep in the same bed as a girl but you come out with those kinds of expressions!" He shouts at me as it falls into place as i punch him in the back of the head bringing him to the floor "YOU GODDAMN PERVERT!" I yell at his so loud the it spreads through the manor and everyone comes rushing to us as they see my scowl and Issei sitting on the floor holding his head and quickly get the idea leaving us alone.
Timeskip
"Now Issei i want you to build up your sacred gear till it's fully boosted" i tell him as he summons his sacred gear as does it. After waiting for about three a half minutes he calls out "it's done!" "Now stick your hand out and focus all that energy in front of you" i command as he does it and after a couple attempts a small ball of energy is infront of him " is this it?" He questions as i nod walking infront of him "Damnit!" He yells out frustrated at the size of it puching the ball as i massive wave of energy approaches me. I equip my shield and try to block the attack as it does it's job before breaking and sending my back.
The dust cloud settles that was built up from the attack as everyone lools to see me with my arms raised damaged as my jacket has and hoodie had been blasted to smithereens leaving me in my white dress shirt on my top half, i have bloods drippind own my forehead as there are light first degree burns on my fore arms but the most damage was done to my left eye as a third degree burn covers it

(Like Todoroki from My hero)
Everyone runs up to me as Kuroka envelopes me in a hug happy I'm not too injured "Asia heals him please" Rias asks as she looks hesitant and after a bit she speaks up "I'm sorry i can't" she speaks softly as Rias, Kuroka and I understand her hesitation. I speak up as Kuroka does her best to heal me though she isn't anywhere close to Asia twilight healing " Issei, great job on the attack but next time aim at soneone who isn't an ally, i'm not fight for proper training today to i'll summon my familiar to help out" i finish as Kuroka continues to heal me as i stick out my hand aiming it to the sky as i call out "Alucard, come forth!"
A massive transportation appears in the  sky as Alucard flies out and roars shocking the members of the ORC. "That the same roar we heard in the familiar forest!" kiba says "You're familiar is a dragon?" Rias asks "Isn't Alucard just Dracula spelt backwards?" Issei questions as Akeno gains a pleasured expression? Asia dawns a Shocked/terrified one and Shirones face reamains neutral. "Until i recover you will be fighting Alucard, Good luck." I tell them as they get ready for a challenging foe.
Timeskip to last day because i don't know what else to write
We are resting after dinner as we finished the final day of training. Issei and Rias leatnt to dodge the hard way and Issei make a magic skill 'Dress Break' he calls it as when he touches someone a snaps his fingers the enemies clothes are destroyed and Rias wasn't able to learn much except an increase in damage to her destruction magic. Asia learnt how to make a barrier so she block an enemies attack though is isn't as strong as my shield it can take a hit, Akeno is able to hold back her Sadistic tendencies... a bit but not much. Kiba and Shirone had the most growth by learning some proper sword techniques he can hold his own in a fight and Shirone and move fairly quickly now and doesn't rely on just strength, and i gained a burn on my face that isn't going away thanks to Asia's unwillingness to heal me.
Kuroka rests her head on my shoulder as i snake my arm around her and pet her causing her to purr.  "Do you think they can win?" i ask her as she lets out a content sigh before answering "honestly i'm not sure, if you where fighting with them sure, but on their own well... it's debatable" she tells me before i leaning down and kiss her head as i stop petting her letting my arm fall down to her waist as i rest my head on hers.

(Lemme know what you think)