Dohnaseek: Who are you?? Show yourself...
Sparda: I am standing here dumba** and who I do not matter to you.
Dohnaseek: Watch your mouth you pretty kid, but I would really like to break your arrogance before killing you.
Dohnaseek makes a light spear and throws that on Sparda with inhuman speed but as soon as the spear touches him it returns to Dohnaseek with triple speed and pierces his stomach. Dohnaseek falls on the ground with a hole in his stomach. He was still alive but was even unable to comprehend what happened.
Sparda: It would be an insult if I have to raise a hand to kill an insect-like you.
Dohnaseek: How dare you call me an insect???? I will kill you!!!!!!
Dohnaseek still managed to form a light spear and threw it at Sparda, gain the same thing happened but this time the spear directly pierced his heart. Dohnaseek could not even believe what happened he had a look of disbelief on his face before he died.
Sparda: As I said to even raise a hand against you would be insulting.
After saying that Sparda activated his EMS and used Amaterasu to burn down Dohnaseek's corpse. After that Sparda took out his phone and called Azazel. His phone rang 2 times before he picked up.
Azazel: Have you found out about their plan??
Sparda: I have done that and I killed a fallen, his name was Dohnaseek he attacked me so he had to die.
Azazel: Alright, so what are they planning?
Sparda: One of them had killed this generation's red dragon emperor but was revived as a devil by Rias Gremory and they are currently waiting for a Nun to come the day after tomorrow, they want to extract her sacred gear.
Azazel: Ok do whatever you want just bring the surviving fallens to me if any left.
Sparda: Ok I will do that.
After that Sparda cut the call and went home and found that Amy had prepared dinner. After having a nice dinner Sparda took a bath and went to sleep to his room and found Amy and Tia both in a mood to have some fun. Obviously, they had a lot of fun together and then they fell asleep.
The next day he went to school and saw Issei coming to school with Rias. Kiba came to call Issei to ORC during the lunch break. He decided to pay them a visit so that make clear to Issei that Akeno and Shirone are off-limits. Shirone was not a love interest to Sparda but most likely a sister. So he didn't want Issei to be leering over them with his filthy eyes.
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A/N: I know a lot of guys will rage about this but I have planned something for her in the near future.
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Sparda told Tia that he needed to something and he made his way towards ORC. He made a space barrier around him so that no one could sense him and listened to their conversation. As soon as Rias completed her explanation to him. Sparda decided to enter and he broke his barrier and knocked on the door. The door was opened by Kiba.
Sparda: Well that is a surprise.
Rias: What is??
Sparda: You really got some luck, you got yourself this generation's red dragon emperor as your servant.
Everyone in the room was shocked except Sparda and Issei. Issei had a confused look on his face as usual well he was Issei after all.
Issei: What are you doing here pretty boy, there is already a pretty boy here. Don't tell me you are also a devil.
Sparda: Yes I am a devil, but keep it noted I am not in her peerage.
Issei: You can't be a devil, Rias-senpai told me that holy objects are harmful for devils and you wear a cross.
Sparda: Believe me I am devil.
Rias and Kiba were shocked that she got someone in her peerage who can rival gods. But Akeno and Shirone were shocked for a completely different reason. They knew Sparda's brother was the white dragon emperor, meaning Issei had to fight him eventually. They felt pity for Issei.
Rias: Why are you here Sparda??
Sparda: I am here to make this pervert understand something. Stay away from Akeno and Shirone, Akeno is mine and Shirone is like my sister. This is the only time I am going to ask you nicely. If you disregard me I will give you a slow and painful death even Rias wouldn't be able to save you from that you understand me??
Issei was about to retort to him but Rias beat him.
Rias: I will be sure to keep him in check, I give you my word.
Sparda: You better keep your word or you will be searching for new pawns.
After saying that Sparda left ORC and started walking towards the school.
Issei: Who was he?? How dare he talk to you like that??
Rias: Issei please listen to me he is a very strong devil, even I won't be able to protect you if you incur his wrath. Please don't offend Akeno or Shirone in any way.
Akeno and Shirone felt really nice that someone would go to such high lengths for them. Akeno was proud of him.
Akeno: Just don't try anything perverted near me and we can be friends.
Shirone: Stay away from me pervert.
Issei was really devastated hearing that he can't be with Akeno and Shirone but he soon cheered up because he can make his moves on Rias and Sparda didn't warn him about her.
After the school was over Sparda went to talk with Sona. He played chess with her and then he and Tia left the SCR and drove to their home. After reaching home he followed his usual routine. While he was on bed he was thinking that if he should ask Sona and Akeno to move in with him. Next day Asia Argento would be coming into the town meaning things will get a little messy. Thinking all these Sparda fell asleep.