Nathan shuffled uncomfortably as he adjusted his clothes. Formal clothes.

He was wearing a white shirt and black pants, with a green vest on top of them. To top it off, he was also wearing a cloak - a green cloak, decorated with a floral design and pauldrons on his shoulders.

'It's so easy for the cloak to fall off when I'm walking around, and the vest is too tight…', Nathan mentally complained as he headed through the halls, towards the area where the party would be held- the ballroom.

When he approached the door, he noticed two people standing beside it; Sekirai's parents.

Nathan sported a look of confusion, "Mom? Dad? What are you guys doing here?"

The two smiled, and Alisa replied, "We wanted to see you before the celebration."

"...Okay?",

When Nathan was in front of the door, 'his' mom hugged him and said, "I'm proud of you, my little hero. Now go, it's your party."

'You make it sound like I'm gonna die.'

Nathan smiled but said nothing as he opened the door, where guests waited for him.

He scoured through the crowd, and instantly, he noticed the heads of the families discussing something- specifically the Bael, Gremory, and Agares head.

His entrance to the ballroom brought attention to him, and Nathan momentarily became embarrassed as he didn't think there would be this many guests.

Fortunately, this was another part of his preparation, something that allowed him to recover from his flash of embarrassment.

'Alright, let's do this.'

Nathan was supposed to give a small speech- one that has been prepared by his father, to the crowd.

He took a deep breath, before approaching the microphone that awaited him on the stage that he was standing on.

Nathan smiled before, speaking, "Good evening. It's a pleasure to have all of you attending my coming of age party. Every one of you here are distinguished guests, and I cannot overstate how much of an honor it is to see you tonight. I hope that you all have a great time at the party, and once again, thank you all for coming.

"Congratulations on your 13th birthday. Welcome to the Devil Society, officially."

"Thank you."

Nathan conversed with the guests, accepting their congratulations with a smile on his face, as he tried to find his targets for the night.

'Sairaorg Bael, Rias Gremory, Sona Sitri, and Seekvaira Agares…', he mumbled their names in his head as he walked around, looking for his targets.

As his gaze passed through the groups that was formed, he stopped on one person standing alone.

'There he is.'

His gaze stopped on one Sairaorg Bael, who was enjoying a variety of dishes, and who was also his new destination.

"Good evening, I'm Sekirai. Have you been enjoying the party?"

Sairaorg looked up from his food with a dull gaze and replied with a nod, "I'm Sairaorg. As you can see," Sairaorg gestured towards his food, "I'm enjoying the food provided quite a bit. Thank you for inviting me."

"It's only natural to have the heir of the Great King at the party, is it not?"

At the mention of his father, Sairaorg's face soured noticeably.

Nathan instantly noticed that, and he took the initiative to salvage the conversation, "I apologize if my words offended you."

"No. It's nothing.", Sairaorg waved it off with a nonchalant look, although Nathan could see the frustration in his eyes.

Nathan attempted to continue the conversation with Sairaorg, trying to forge some kind of relationship with him with the limited amount of time that he has, "If you don't mind me asking,", Nathan drawled, "Do you have a bad relationship with Lord Bael?"

From what Nathan remembered of the DxD canon, Sairaorg's relationship with his father… wasn't the best.

Sairaorg hesitated for a moment, before replying, "Our relationship is… strained."

"I see…"

Sairaorg finally took a deep breath and sighed, "Let's not talk about this at your party. The topic doesn't fit the atmosphere."

Nathan smiled, grateful that Sairaorg decided to break off the awkward silence between them, "Yeah. Let's talk about some other things."

Nathan and Sairaorg then continued their conversation for quite a while- talking about various topics such as their daily lives, their hopes and dreams for the future, and the plans that their parents have for them.

The end of their conversation was signalled by the end of the party, which prompted them to say their goodbyes to each other.

"I hope that I'll see you again in the future.", Sairaorg smiled pleasantly, shaking Nathan's hands as he bid goodbye.

"Likewise. I hope that you come to visit our mansion in the future. You'll always be welcome here." Nathan returned the smile and the gesture, while inviting Sairaorg to his mansion in the future as well.

'If I'm not wrong, Sairaorg will be sent to the outskirts of the Bael territory soon… I'll make my move then.'

"Sekirai, you have a guest."

Nathan's training was interrupted by Sekirai's father, who leaned against the tree as he called 'his' son.

"You're still training your body?", Sekezer asked Nathan as he noticed the sweat on the younger man's bare body.

"Yeah. Our power inherently lacks offensive capabilities. Might as well train my body to be safe."

"... I see. Well, as I said earlier, you have a guest waiting. Not just any normal guest, mind you."

"Who?", Nathan asked as he wiped the sweat off of his body, and put on a shirt.

"Important guests. Take a shower before meeting them. They're already here, so don't take too long."

"Okay."

Nathan hurried back to his mansion as he mentally made a list of people who would visit him.

'Sairaorg… and…', Nathan then realized, no one would visit him, except for Sairaorg, who he met a month earlier at his coming of age party.

'The few times Sairaorg visited, he always made it a point to notify me ahead of time…'

Nathan thought as he washed the dirt and grime off of his body in the shower, before drying himself and putting on fresh clothes.

After finishing his shower, Nathan headed to the living room, where the guest would be waiting for him.

As he opened the door, he noticed that Alisa and Sekezer were talking with someone, and he looked to the other party.

The first thing he noticed was the absolutely absurd amount of demonic energy that his guest had. The second thing was the green hair.

Absolutely absurd amount of demonic energy + green hair =... Ajuka Beelzebub.