Disclaimer: First Chapter
Story Start!

School was a unique experience.

Everyone fawned over her and treated her nicely, especially the girls in her class... though the boys seemed to stay FAR away from her when they heard what her family name was. It would seem they were pretty intimidated by the "Uzumaki" name to the point they didn't want to risk offending her, and drawing Naruto's eyes towards them for retribution.

"Are you telling me... you have an awesome little brother, and you don't even do the things a big sister should do?"

"... There are things a big sister should do?" Asia asked as she was taken aback by such simple ignorance on her part. She was talking to one of her classmates, a girl who was currently walking with her to her home. The girl had invited herself over, and Asia had just been too polite to turn her down.

Aika Kiryuu.

The small chested, brown haired, self-proclaimed most perverted girl in the entire school.

Aika whistled with an impressed look when she saw a shirtless Naruto that was doing yard work, tending to a garden in the front yard of the "Uzumaki" home. She actually stopped and stared at him, and she would have made a comment if it weren't for the fact there was no way he would have heard her. His ears were currently plugged up, and it would make sense considering there was heavy machinery that was right next to him.

He had machines for Tilling and Cultivating right behind him, and with the smell of gasoline in the area, and the lines in the yard that had been tilled by the machines, she could see that he had used them. His arms were also covered in dirt, and he had some kind of fertilizer in a bucket next to him that he was shoving into the dirt with his bare fists.

"Your little bro is sexy..."

"Sexy?" Asia asked with a tilted head. "He just really likes gardening... I do too... it's been a dream of mine to have a little farm of my own." Asia hadn't mentioned it to Naruto because she didn't want to intrude on his hobby. He seemed genuinely happy when he was doing yard work in his free time that wasn't spent training for something.

Aika shrugged her shoulders with a laugh.

"Oh Asia, you two are siblings, or course you both like a lot of the same things. But you need to do more than just like the same things. You just moved into the country, and now you live with the little brother you barely know... you should be more active." Aika followed Asia into the house, but not before she took out her phone and took a picture of Naruto.

-30 Minutes Later-

The sound of machines could be heard again outside, showing that Naruto was using the machines again. Since they were inside the house, it wasn't nearly as loud as it could have been, so it was barely even an inconvenience to the girls inside.

"Pffffffft." Aika almost lost it.

Asia was currently cooking wearing nothing but an apron.

"What?" Asia asked with a tilted head, since she had gotten changed to make them a snack. Aika looked very confused.

"Nothing at all... do you always cook like this?"

"Only at home." Asia smiled and answered, and the normal part of Aika wanted to make a comment that somebody had told her wrong, but the perverted part of her instantly beat it down and went with it. "I can't really do japanese cooking, so I'm just making something really simple. I need to do more big sister things after all!" Asia had been really inspired to cook more meals.

She was the big sister, technically that was.

"You know, big sisters do more than just cook." Aika had a growing smirk on her face, slowly growing and with her unable to stop it. Asia instantly turned around, very interested in the topic with a wide, eager smile. She showed her willingness to learn with just that smile alone.

This was going to be too funny.

"Really?"

"Yes, why yes oh yes. Big Sisters have to dote on their younger brothers. Doing things like waking them up in the morning, patting them on the head when they do good things, spending lots of quality time with them."

"Wait a second, I'm going to take notes." Asia left the room in a hurry to grab a pen and paper.

She had to.

Naruto had saved her life and accepted her as a member of his family. He gave her a home, and allowed her to start a brand new life completely. It was thanks to him that she could attend school like a normal girl, and she had a family to call her own. It was a family without parents, cousins, aunts and uncles, or anything extended, but it was still a family all the same. Asia grabbed her note taking tools and rushed back to the kitchen, where Aika was waiting for her with a smile.

'This girl is just precious.' Aika thought as Asia, like a loving golden retriever, sat down and started to write down what was already said. 'This girl is the complete opposite of Akeno... who would have guessed that she was secretely a masochist.' Aika had already heard the rumors about Akeno and Rias losing some kind of cosplay competition. "Give him lots of hugs and kisses, and be sure to embarass him a little in front of others." Aika started to give advice.

"Embarass..."

"Just a little, just a little bit. A little embarassment helps with the bonding process. Just do things like be super affectionate in front of others. Guys his age get really embarassed to be seen being doted on... but it actually makes them happy." Aika gave somewhat true, somewhat false advice to Asia. Asia just ate it right up with a big smile.

"I see."

"Oh, and since Naruto..." Aika stopped talking when the front door opened and a hosed off Naruto walked in, dripping wet. He hosed himself down, so that he wouldn't attract any dirt into the house, though he was still a little dirty feeling. Aika looked towards him, and her jaw dropped as low as it could go.

The way the sun shined through the door into the dim living room.

The way it glittered off of his wet hair, his shirtless body with moisture dripping all from it. The way he glanced over towards them, but didn't look directly at them once he saw Asia. He was radiating with raw sex appeal that Aika didn't know a guy younger than her could have. His slim build, but with tight muscle, was only complimented by the fact that he was slim in some areas, but built tough in others.

"Asia, at least put some panties on..." Naruto grumbled as he walked through the living room.

Aika watched him go.

She slipped and fell off of her chair when she leaned out of it too much, because she had to keep watching him. When she hit the floor, she recovered from her hypnosis and got back into the chair. Aika took the pen and paper from Asia and started to draw a Radar Chart right then and there using all of the information that she had just witnessed.

Her glasses glinted.

'My Perverted Glasses power has never been so supremely focused before! I didn't just get length and girth that time, I was so aroused I managed to get information I had never gotten before... this is the awakening of my new Perverted Power!' Aika had to record everything that her eyes had recovered about Naruto, how he helped her to focus her penis-related superpower to a point that she had never focused before.

"What is that chart?"

5 stats.

She had been so aroused that she had been able to break down Naruto's dick into 5 different stats related to quality. Size: Length, Size: Girth, Max Hardness, Stamina: Lasting Power, and Stamina: Recovery Power. She had been able to get measurements on ALL of those stats thanks to how her hyper focused arousal had been able to upgrade her already existing ability to measure dick sizes through a guy's clothes.

Asia was just smiling.

"This... even with my new power, this stat is out of this world... amazing." Aika was left completely unimpressed by 3 of the stats, but there was one stat that she had seen that had been off the chart that her upgraded had recorded on.

Size - Length: 3/10 (Score not recorded in Inches, 3 does not mean 3 inches long)
Size - Girth: 3/10 (Score not recorded in Inches, 3 does not mean 3 inches around)
Max Hardness: 6/10
Stamina - Lasting Power: 3/10
Stamina - Recovery Power: 15/10

While some of those stats were low, the fact that one of the most important stats was extremely high made for a shocking and arousing discovery for her. That stat implied that he could keep going, and going, and going, and going after cumming over and over again, with very little rest between each round of sex. If the 4 to 6 range was the average range, then that would imply that his recovery power was not just extremely high for a guy, but on a completely different level.

'I want this... How do I seduce him into sleeping with me though.' Aika wanted to test the limits of that recovery time. Aika needed to get herself a piece of such fine statistics. While not every stat was super high, and some were low, she knew a fine cock when she saw one. She had recorded the dick sizes of every guy in her school, and she had a lot to compare to. His size stats weren't far below the normal, and seeing as he wasn't ranked at a 1 or a 2, she could tell she wasn't dealing with a micro. 'I gotta see... I have GOTTA see just how many times I can make him cum. I need to find out just how insane a score of 15 would feel.'

She needed to know.

"... Uh?"

"Oh, sorry, got a little side tracked there." Aika tore off the piece of paper and stuffed it into her skirt pocket. She had gotten so obsessed with her upgraded power, that she had almost forgotten that she was next to the guy's sister when she started to record it all. She was glad that she didn't label the chart on the paper just yet, and that she didn't say anything too bad out loud. '... Damn... I'm wet... I'm soaked.'

Aika could feel her panties were soaked.

She wanted to go and masturbate, or better yet, see if she could get close and personal with the guy who aroused her so much that he upgraded her natural ability to the next level.

"Do you have any other tips for how I can be a better big sister?" Asia asked with a smile.

Aika did a lot of math in her head.

"... I have tons of tips. Of course, it will take a lot of work, but don't worry. I'll be by your side the entire way. We're going to turn you into the best big sister possible." Aika grabbed both of Asia's shoulders. Aika had stood up when she did this.

There was a pause.

"... Oh! I am so sorry! I didn't even realize that you were sitting in a wet chair!"

Aika flushed in humiliation when Asia innocently noticed what she had done, and the issue that she had created for herself.

'The Little Brother has a dick with a powerful recovery power, and the Big Sister has a damn near cinnamon roll sex energy... I want a threesome.' Aika evolved her goal in an instant.

She wanted to seduce both siblings.

She had to taste that dick, and she HAD to corrupt this cinnamon roll of a girl.

She needed it.

Chapter End!
Please Leave Me Lots of Nice Long Reviews, But No Flames Please!

Considering all Perverted Powers seem to upgrade when faced with extreme arousal in DxD, it only makes sense that Aika would also get upgraded when faced with extreme arousal.
The girl LITERALLY has the power to judge and rank dicks just by looking at a dude wearing clothes.
There is zero chance that the perverted Aika would be able to handle the "Infamous Naruto Wet Hair Flip" and not evolve into a bigger pervert.