Hyperdimension Neptunia belongs to Compile Heart, Idea Factory, Sega and whomever else worked on it.

So this idea came to me and I had to write it out.

Sitting behind her desk, Blanc looked at the young man that had been brought before her by her sisters. "So you're from another dimension then?" He nodded at her, showing a level of nervousness that she didn't think was warranted, but decided to not worry about it. "I see. Do you have any clue how you got here?"

He shook his head. "No, I was helping with an experiment involving teleportation across dimensions and got blasted here instead of where I was supposed to go."

"I see," Blanc nodded, "and from what Ram told me, you claim to be... A Devil from your world?" The boy nodded at her. "I'd be a little skeptical of you, but I can certainly feel some energy from you that is... Impure, but I also feel another energy from you. What is it?"

The boy chuckled nervously and held out his left hand as it glowed for a moment and a red metal gauntlet with a green gem in the center of where the back of his hand was located at. "This is Boosted Gear, it holds the soul of Ddraig."

"Interesting." Blanc looked at the gauntlet. "Can I ask what it does?"

"Well, it has the ability to boost my abilities."

"I see, is there some sort of trick to it?"

"It doubles my abilities every ten seconds." The boy shrugged at her questions. "I can use it to transfer the power I store up to others to boost their abilities."

Blanc stared at him, her face showing awe and worry at hearing that. "That's... Troublesome. If you boosted someone strong enough, that could be dangerous."

He nodded at her. "Well, I can boost more than just someone's abilities."

"Like what?" Blanc was curious.

"Well, ah..." The boy blushed while giggling in a way that reminded Blanc of Neptune whenever she was in a mood to grope Compa, Noire or Vert when they went to the hotsprings. "I've used it to increase the size of my girl's breasts."

Blanc suddenly stiffened and sat up straight. "...Say that again."

"..." The boy tilted his head in confusion. "I can use this to boost a girl's boob size."

"And because of that, I'm known as the Breast Dragon Emperor!" A male voice cried out in despair from the gauntlet. "IT SUCKS!"

"...I take it that's the dragon inside the gauntlet speaking?" Blanc asked, getting a nod from the boy. "...You may be stuck in Gamindustri for some time. Your name is..."

"Issei Hyuudou," the boy answered her. "I hope it's okay for a Devil to be in a holy land with a Goddess and..." He stopped as Blanc held up a hand.

"Knock it off with that holy land crap." Blanc gave him an annoyed look. "If any of us Goddesses cared about that shit, we wouldn't live with humans."

"...Fair point." Issei conceded. "Sorry, just that I've met a few Gods in my world and some of them are really scary people."

"Don't worry about that." Blanc smirked at him. "Feed Neptune some pudding and she'll be your best friend. Anyway, I do have a request for you."

"...What?" Issei asked and Blanc blushed heavily. "What's wrong?"

"Don't make a big issue out of this, but I want you to..." Blanc pointed at the gauntlet. "Use your power to make my boobs grow."

Issei blinked and grinned. "...I get to touch divine boobs and not get smited?"

"If you act like a pervert and fondle me, I will hurt you, but otherwise no, I won't smite you."

"SCORE!" Issei cheered as Blanc got up and walked around her desk. "You want me to..."

"Yes," Blanc nodded, "right now."

"Sweet!" Issei cheered and put his left hand on Blanc's chest, causing the CPU to blush harder. "Let's do this, Ddraig!"

"BOOST!"

Issei frowned as he realized something about Blanc's chest...

It was smaller than Koneko's chest when he first met her.

"This is going to take awhile." Issei muttered out loud. He gulped as he saw Blanc's eye go red. "I just mean that there's not much to work with and..."

He shut up when Blanc slapped him. "Don't comment on my boobs again, you hear?"

"Yes, ma'am." He nodded in agreement, his face stinging in ways that he hadn't felt in a long, long time.

Still, he got to feel a Goddess's chest! Azazel was going to be so jealous of him when he got back home to tell this story.

Blanc was mentally giddy. Finally! She'd have some boobs and Vert could stop her infernal teasing!

Issei Hyuudou is from High School DxD if you didn't know. And yes, he can use the power of an ancient, ultra powerful Dragon that's sealed in his soul to increase a girl's boob size.