Issei's POV

I wan on the living room with Rias and she's making a magic circle to teleport us to the Underworld.

Issei: "Are you sure you want to come Rias? I'm just gonna talk to your brother."

Rias: "Yes I'm sure."

Issei: "Alright then."

She created a Magic circle and we teleport the Underworld. When we arrived, we were greeted by Grayfia.

Grayfia: "Welcome back Lord Issei, Rias-sama."

Rias: "Thank you Grayfia. Is my brother here?"

Grayfia: "Lord Sirzechs is at his office. Please follow me and I will take you to him."

Issei: "Thank you Grayfia."

We followed Grayfia to Sirzechs office. And when we arrive, his office looked pretty normal for a Devil Lord.

Sirzechs: "Issei, Rias what can I do for you?"

Issei: "I need to talk to you about something."

Sirzechs: "What would that be?"

Issei: "I need you to clear Kuroka's name as a stray."

Grayfia, Sirzechs and Rias were shock when I said Kuroka's name.

Sirzechs: "I sorry but I cannot do that. She killed her Master because of her thirst for power."

Issei: "No, she only did that to save her sister from her Master."

Rias: "How do you know her?"

Issei: "I've met her before and she was attack by the Khaos Brigade."

Sirzechs: "The Khaos Brigade?! If what you say is true, I cannot clear her name easily. We need proof."

Issei: "Then take me to her Master's old home and I'm going to find it."

Sirzechs: "Then Me and Grayfia will come with you."

Rias: "I'll go too."

Issei: "Then let's go."

We walked outside of the mansion and head to the Garden and Sirzechs created a Magic circle. When we arrived, I saw and abandon looking castle in front of us.

Issei: "Is this the place?"

Sirzechs: "Yes it is."

We went to the front door and it was sealed very shut. So I summon the Nemean Cestus and destroyed the door in one blow.

Issei: "So wheres he's Lab?"

Sirzechs: "It's underground, the stairs is just behind that door over there."

I open the door he pointed and went down to the stairs. We we got down, I saw that it was just an ordinary Lab with some dried blood on the wall and floor.

Sirzechs: "This is where we found her Master's body."

Issei: "Let's start finding some evidence here."

I went to the book shelf to see if I can find something. I pick up some books and try to read something that this guys has done.

Issei: "Did you guys find anything?"

Rias: "Nothing yet."

Sirzechs: "Nothing here."

Issei(Thinking): "There has to be something to prove Kuroka's innocence."

I keep searching each book on the shelf until grab one book and a hidden staircase opened behind the shelf.

Issei: "Sirzechs, do you know this?"

Sirzechs: "No, I do not."

We went down to the staircase and it lead to another Lab. We saw saw some mutated creatures inside of a big tube and some dead creatures inside of a cages.

Issei(Shock): "What the hell is this?!"

Grayfia(Shock): "T-This is monstrosity."

We all look around and can't believe what we all see. Rias couldn't handle what she saw and she threw up While Grayfia help her out of here.

Sirzechs: "Kuroka made a right choice to kill him."

Issei: "That guy was lucky that I didn't kill him, or else his soul will be joining Jack in torment. Will this be enough evidence to clear Kuroka's name?"

Sirzechs: "Yes it is Issei. I will talk to the other Devil Kings about this."

Issei: "Fine Let's go."

Time Skip

Me and Rias went back to the mansion on earth while Sirzechs made an emergency meeting with the other Devil Kings.

Issei: "Rias, don't tell Koneko about her sister for now.

Rias: "Why?"

Issei: "Let's just surprise her. And tell the others that they can't tell Koneko too."

Rias: "Alright, understood."

Issei: "I'll be in my room while waiting for the others."

Author's POV

Issei walked up stairs heading to his room while Rias just watch him. Then Rias thought something what Issei said then an idea pop on her head. She followed Issei to his room and saw him laying on the bed with his eyes close. She locked the door and remove her cloths leaving only her underwear.

LEMON WARNING

She started to crawl into the bed and Issei felt the bed moving. He open his eyes and saw Rias is crawling towards him only wearing her underwear.

Issei: "Rias, what are you doing?"

Rias: "I was thinking of having fun while we wait for the others.~"

Issei: "Alright then, since I got nothing to do."

Issei started to take his cloths off only leaving his boxers. They started to make out first while Rias is rubbing her hands on his manhood to make it erect and Issei is rubbing her chest while the bra is in between the skin.

After they make out, Rias pulled down Issei's boxer revealing his fully erect manhood standing in salute.

Rias: "Even though I seen it many time, I'm still surprise that it's this big.~"

She put his manhood between her chest and start to move it up and down while she lick on the tip.

Issei: "R-Rias, I'm gonna-"

Rias: "Go ahead, release every single drop.~"

Issei climax and he release it in Rias' mouth and she swallowed everything.

Rias: "Yum, delicious as always.~"

Issei: "Too can play it that game."

Issei laid on the bed and Rias sits on his chest. Rias stroke Issei's manhood with her mouth while Issei is licking the entrance of Rias' womanhood.

Rias: "Ahh~ Yes Issei!~ Keep licking me there!~"

After a few minutes of session, the two of them climax at each other. Rias is now sitting on Issei's hips and she's rubbing the entrance of her womanhood to his manhood.

Issei: "You know, your just teasing yourself if you keep doing that."

Rias: "I was just testing you if it works against you, but I guess not."

She re-position herself and inserted Issei's manhood inside her. She moan in deep pleasure as she keep moving up and down.

Rias: "Ahh!~ Yes~ I love this feeling!~"

Issei sits up and sucks Rias' left breast while he grope the other one.

Issei: "Rias, I'm about to cum."

Rias: "Do it inside!~"

Issei reaches into his climax and release it inside Rias. The two of them are now laying on the bed panting.

Rias: "Your the best.~"

Issei: "Heh, tell me something I'm not."

LEMON END

The entire ORC arrived at the mansion along with Sona and Tsubaki.

Sona: "Thank you for letting me come with you guys."

Akeno: "No problem, but what do you wanna talk about with Issei-kun?"

Sona: "Something important. Where is he by the way? I haven't seen him in school."

Akeno: "He said that he need to talk to Sirzechs about something. I'm guessing Rias is with him too."

Tsubaki: "But where is he now?"

Xenovia: "Maybe he's up to his room, I'll go check."

Xenovia went upstairs to Issei's room to call him that Sona whats to see him. She knock at Issei's door.

Xenovia: "Hey Issei, are you here? Sona needs to see you."

There was no answer so she knock a second time and still no answer. She just twist the door knob and it was unlock so she open the door and saw Issei and Rias were sleeping while naked. She walked towards Issei and poke his cheek with her finger trying to wake him up.

Xenovia: "Hey Issei, wake up. You have a guest."

Issei: "Xenovia? What are you doing here?"

Xenovia: "I was trying to see if your here because Sona wants to talk to you, but then I saw you and the President naked here and the blanket is a little wet and I guessing that you went sex. Can I be next?"

Issei: "Maybe next time. Tell them that I'll head down, I'm just gonna put some cloths on.

Xenovia: "Okay, I'm expecting my turn next time."

Xenovia went to the door and closed it and went back down stairs to the others.

Sona: "Is Issei in his room?"

Xenovia: "Yes. He and Rias just finished their sex and going down here in a few minutes."

Everyone blushed madly when Xenovia boldly tell them that Issei and Rias just had sex.

Akeno: "Ara-ara, I'm so jealous of the President right now.~"

Koneko(Blushing): "O-Onii-chan and President just had s-s-s-sex right now?"

Xenovia: "Yeah, they just did."

Sona(Blushing): "I-I-It's just normal I guess. I mean, Rias is his fiance."

Issei then came down the stairs along with Rias. He saw all of them except for Xenovia blushing while Kiba drag Gasper out of the situation.

Issei: "Hey Sona, what do you wanna talk about?"

Sona(Blushing): "R-Right, I wanna talk to about the situation we have."

Issei: "Very well, follow me."

Issei went out of the door and walk to the garden while Rias and Sona follow him.

Issei's POV

I walked outside of the mansion and head to the garden while Rias and Sona follow me.

I sit on the chair while Rias sits next to me and Sona sits in front of us.

Issei: "So Sona, what do you wanna talk about?"

Sona: "About Kuroka. You already talked it about Sirzechs, did you able to clear her name?"

Issei: "Yes. Kuroka's former master was a monster that meant to be killed. It was enough evidence to clear her name."

Rias: "Wait, How did you know about Kuroka's situation Sona?"

Sona: "Because we saw her getting attacked by the Khaos Brigade while Issei and I were still on our date. So Issei decides to help her and hide her at my house for the time being."

Rias: "You knew and you didn't tell me?"

Sona: "I already knew that your going to know because your going with Issei to talk to your brother."

Rias: "You always get ahead of me huh?"

Sona: "So Issei, are you going to tell Koneko about her sister being free?"

Issei: "I will, but I need to talk to her first. Can you bring Kuroka here?"

She nodded and summons her Magic Circle on the floor and Kuroka appeared on it still wearing a black kimono.

Issei: "How you doing Kuroka?"

Koruka: "I'm good, resting on Sona's house recover most of my strength."

Issei: "I see. We've got a news for you. Your name has been cleared and you are now free."

She just stared at me for 5 seconds and her eyes starting to tear up and she hugged me tightly.

Koruka(Crying): "THANK YOU!! THANK YOU!! THANK YOU!! THANK YOU!!"

Issei: "It's alright, It's okay. Do you want to see your sister?"

Koruka(Crying): "Yes I do."

Issei: "I gonna talk to her first. Rias, can you call Koneko hear? And Kuroka, you need to hide first."

Rias went inside the mansion to call Koneko while Kuroka hide somewhere near and she hide her Senjutsu so Koneko won't be able to detect them. I then saw Koneko walking towards me and sitting right next to me.

Koneko: "President said that you want to talk to me about something, Onii-chan."

Issei: "Actually, there is. Do you know exactly what happen to your sister?"

Her eyes went wide and she gritted her teeth.

Koneko: "O-Onee-chan, left all alone. No where to go, don't know what to do."

Issei: "There's a reason why she's force to leave you. So you cannot be harm by the others who wants to kill her."

Koneko(Crying): "Onee-chan..."

Issei: "Koneko, how do you feel about your sister?"

Koneko(Crying): "I... I... I want to apologize to Onee-chan."

I look over where Kuroka is hiding and wave my hand signalling her to come out.

Kuroka: "Shirone..."

Once Koneko heard a familiar voice, she look up and saw her sister crying while looking to her as well.

Koneko: "Onee-chan!"

The two of them run on each other and hugging one another while crying.

Koneko(Crying): "Onee-chan, I'm so sorry!"

Kuroka(Crying): "No Shirone, I should be apologizing to you for leaving you!"

Koneko(Crying): "Onee-chan!"

Kuroka(Crying): "Shirone!"

I got up on my chair and walked inside the mansion to leave to two sisters alone to reconnect their bond.

Rias: "So how did it go?"

Issei: "Better than I expected. Let's just leave them alone, they still have some catching up to do."

Rias: "Alright then. I'm happy for the both of them. I still worried though, Now that Kuroka is free, there's still some devil out there that will hunt her."

Issei: "They'll have to get to first. I'm kinda hungry because of our fun. Tohru."

Tohru: "Yes, Master Issei?"

Issei: "Can you please get dinner ready?"

Tohru: "Yes Master, were already on it."

She went to the kitchen to inform the other maid to prepare the dinner.

Issei: "Hey Sona, why don't you stay here for dinner?"

Sona: "I'd love to."

Issei: "Why don't you call Tsubaki and Saji to come here??"

Sona: "Are you sure about that?"

Issei: "Yeah, even thought that Saji is a pervert, he's still a good guy."

Sona: "Alright then, I'll call them."

Issei: "Hey Rias, have you seen the others?"

Rias: "I think I saw them by the pool."

I went by the pool and saw them testing their powers. Kiba is wearing the shoes I gave him and he's walking on the water. Asia is helping Gasper by throwing tennis balls to him while he freeze all of them. Xenovia is trying to create a new move by dual-wielding the Durandal and Sandalphon, while Akeno is just sitting there watching everyone.

Issei: "Looks like all of you are improving. And I'm glad to see that."

Akeno: "Hello there, Issei-kun.~"

Kiba: "Hey Issei-kun."

Xenovia: "Hello Issei."

Asia/Gasper: "Onii-san/Issei-san!"

Issei: "'Onii-san'?"

Asia(Blushing): "W-Well even since you came alone, I always see you as a big brother figure and the way you saved me from Lady Raynare. That's why I call 'Onii-san'. I-Is that okay with you?"

Issei: "Yeah that's totally fine. Now I got a new little sister."

Asia: "Thank you Onii-san!"

She run to hug me and I hug her back while patting her head.

Issei: "Alright that's enough, let's go back inside the food might be ready."

All: "Hai."

We all went back to inside and they all saw Kuroka next to Koneko. Akeno, Kiba, and Xenovia was about to attack Kuroka but I block their way.

Akeno: "Issei-kun what are you doing? She's dangerous!"

Kiba: "I agree with her Issei-kun, she's an S class stray devil."

Issei: "No she's no anymore."

Akeno: "What do you mean?"

I explain everything to them on what happened to her and how I clear her name and What we saw inside that Lab.

Xenovia: "So she's not a stray anymore?"

Issei: "No, she's free now. But others will come after her, but they'll have to get to first."

Akeno: "So you didn't kill your former Master for power?"

Kuroka: "No, I only killed him to protect Shirone from him."

Asia: "Um, who's Shirone?"

Rias: "That's Koneko's real name."

Asia: "It's kinda cute."

Koneko: "Thanks."

Maid: "Master Issei, your guest have arrived."

Issei: "Thank you, you can let them in."

Saji: "Hey Issei."

Tsubaki: "Thank you for having us here Issei."

Issei: "No problem. Come on, I think dinner is ready."

We went to the dining room and everyone sit on the table.

Tohru: "Everyone, Dinner is serve."

Issei: "Come on guys, let's dig in."

ALL: "ITADAKIMATSU!"