No one POV

It's been a few days after issei was introduced and has revealed his sacred gear which Rias says is just a twice critical but Jason can sense something stronger in it that the pervert just hasn't unlocked yet. It's the middle of class and Issei obviously looks a little troubled and when the bell rings for lunch Jason does something

Jason POV

I walk up to the pervert and grab him by the collar dragging him

Issei: "what the heck John I was doing something" I ignore him and take him outside and I start flying making sure not one is watching "HEY COME ON MAN I DIDN'T DO ANYTHING!"

I fly us to the field that I showed Koneko my forms at and I drop him

Me: "look I don't like you but it's obvious this devil thing is getting to you" he looks away as he gets off the ground so I get in a stance and out my hands up "that's why I'm going to train you" he looks at me weirdly like he's suspicious "look I know your dream is to become the king of harems or whatever but right now you may be stronger than a human but you need to get stronger. Now hit me"

He steps forward and throws a weak punch connecting with my hand so I give him a light tap to the ribs which is equivalent of a full strength human punch

Issei: "ow what the hell man?" I throw a jab and he dodges and I keep coming after him with him dodging and he slowly starts to get it and after dodging a swing he throws a harder punch and keeps going and I change it up by deflecting his attacks and seeing how he reacts as he is a fast learner and after a few minutes I leg sweep him making him fall on his back

Me: "let's get one thing clear okay? Control your perverted tendencies and I'll keep training you. Deal?" I hold my hand out to him and he hesitates before grabbing my hand and I pull him up "lunch is over so let's head back" I put my hand on his shoulder and use instant transmission to teleport us in the bathroom and he instantly goes for a toilet and pukes "sorry I should have warned you"

TIMESKIP

It's night and I'm currently flying above Issei making sure he doesn't do anything stupid on his contracts when I sense Kuroka in the area and I look to my left and see her sitting on a roof and I fly to her and hover as we stare at each other

Me: "hello there" she blushes and shyly looks away "you come here for me or for your sister?"

Kuroka: "I came to try to talk to Shirone" I land on the roof and she stands up still blushing "and to see you again also. I never asked your name"

Me: "the name's Jason. But if there are people other than Koneko call me John" she tilts her head in confusion which is honestly very cute "I don't trust easy but your her sister so I trust you" I grab her by the waist making her blush harder and I use instant transmission

I teleport us outside the gravity chamber as Koneko is currently using it

Me: "I'm gonna let her know. I'll tell you when to enter" I have Luci deactivate the chamber and open the door and I walk in keeping the door open and see Koneko sitting on the ground sweaty and her training clothes torn in certain places "remember when we talked about having you sit down and talk to your sister?"

She looks up at me confused and I look out the door to Kuroka and nod for her to enter

Koneko POV

I'm confused until I see my sister shyly walk in and smile warmly from seeing me

Kuroka: "hi Shirone. It's been awhile" I stand up glaring at her until I see Jason behind her shaking his head and I calm down

The chamber closes and he stands off to the side as me and Kuroka stare at each other

Jason POV

They stare at each other for a few minutes until I reach out with my telepathy

Me: "{Kuroka say something to her}" she jumps a bit and looks toward me and I nod towards Koneko and she moves forward and hesitates before hugging her

Koneko doesn't do anything for a few seconds then slowly returns the hug as Kuroka starts apologizing

Kuroka: "I'm sorry Shirone. I shouldn't have left you. I should have told you" they hug as I watch and Kuroka looks at me and I smile and she smiles back as Koneko looks up at Kuroka

Koneko: "was what he said true?" She nods and Koneko reveals her nekoshou form as the two keep hugging and I approach

Both of them look at me and Kuroka stands up and hugs me

Kuroka: "thank you" she unexpectedly gives me a kiss and Koneko shoves her away from me

Koneko: "Jason is mine" Kuroka tries to reason with Koneko and then she pulls her over to talk and I respectfully not listen with my enhanced hearing so I head over to the chambers console

I'm working on the console of the gravity chamber to see what needs fixed when I feel Koneko hug my right arm and Kuroka hugs my left putting it between her breasts

Me: "um what's happening right now?"

Koneko is blushing as Kuroka has a lustful look on her face

Kuroka: "me and Shirone have decided to share you" I blush hard from this information

Issei POV

Me: "that sucked balls" I finished my last contract and got rewarded with a doll for my efforts as I walk back to the clubhouse thinking about what happened with John today "man with a mentor like him I'm sure to be harem king" I shake my head remembering the deal I made when I see that I'm almost there

I arrive at the clubhouse and see John's gravity thing he mentioned and I see it's not active meaning he is probably done training

Me: "I should see if I could train in there"

In hell Sirzechs POV

I leave the meeting room sighing at how much stuff needs to be done when a devil informant runs up to me out of breathe

Devil: "sir I have information you need to hear" he's panting from exhaustion and looks at me with a serious look "Kuroka has been found and she's in Kuoh"