Karin

Karin. Naruto hadn't got to know her personally, just that she worked for Sasuke during his time as a rogue ninja. The men were stripping her from the waist down and getting a collar ready.

"Help! Help me anyone! You bastards, I'll chop off your dicks and crush your balls underfoot! You! You there! I've seen you in Konoha. You know Sasuke, right?"

She got kicked in her lower back. Naruto stepped in at a speed that startled those guys and he replied to her.

"Let me guess, from that team snake or hawk or something?"

"Yeah, yeah! You wouldn't happen to be who I think you are, would you?"

"Excuse us buddy, but we saw this bitch first."

"I'm talking here."

The chakra emanating from him sent them back into submission like the beta males they were.

"I'm Naruto Uzumaki."

"Uzumaki? Small world, I'm totally from that clan too. Red hair is kind of a signature trait. I mean, you don't have it, but one of your parents did right?"

"Uh yeah, my mom."

"See, I even got this from the bloodline."

Taking this small window of opportunity, she used adamantine chains to subdue her attackers, killing at least one of them.

"Ever seen that before?"

Naruto was amazed to see someone other than his mom using those chains.

"That proves it beyond a doubt. My mom could do that so well she could hold down a tailed beast."

"No kidding? Well, you've been a big help already. I'm going to guess you're under cover, so I'll dispose of the witnesses. He he."

Before he could say anything, she squeezed the chains on them until just a bloody mess was left.

"So cousin, or whatever, how should I repay you?"

She doesn't realize until she noticed the bulge in Naruto's pants, that she's naked from the waist down.

"Oh shit! You're not going to ask me to do that are you? Not after you found out we're related."

Something clicked in Naruto. The sexual fantasy of **** may have just been a fantasy when it came to his mom, but right in front of him was the closest living relative he knows, in a **** position, and he knew the village was a negative influence on him when he blurted out:

"I'm sure you've been gathering intel too, so how about this: we share information, and if you found out anything I haven't, you only have to go as far as a blowjob. Deal?"

She's shocked and disgusted at this turn of events, but complied. She took off her top in the hopes visual stimulation would speed things up. Getting down to business, Naruto's became the first penis she's ever seen in real life. She closed her eyes and thought of Sasuke as she blew Naruto. For Naruto, it was like his first blowjob all over again, but the taboo element turned him on so much, he grabbed her head and made her suck deeper and faster. She didn't like the feel of his chakra during this. It was a different kind of ominous from before.

"Don't forget to swallow my cum."

As far as she was concerned, swallowing wasn't part of the deal, but as he came down her throat, she had **** in the matter. After that experience, they finally shared intel. Naruto smirked.

"I knew more than this during the mission briefing. Time to prepare your body."

"Wait please, I'm a virgin and a blood relative. Oh god, did you get harder from that?! Please, you leaf shinobi are better than this."

Concentrating on her surroundings, she started getting a blurry sense of the connection between the collars, the village, and Naruto's current disposition.

"I think I just figured something out. Those collars make women who wear them obedient sex slaves, but why are there so many men willing to take advantage of them like this. Even perverts aren't all that bad. What if the collars effect your minds too, making you act like the guy in charge does towards women, spreading his philosophy that way? That would mean you don't really want to ****, he's just making you. Resist it."

To her relief, Naruto started walking in a different direction. She went to leave as well, when suddenly, she felt a sensation like she reached the end of a chain, and for good reason. She had that pink collar on her neck, and Naruto was tugging on it. Before she knew it, she was kneeling face down ass up and having her hymen broken by Naruto's cock. She knew it was **** but it felt so good the whole time. Even she didn't know if she was crying from despair or joy. She got her first order in how to address her new master.

"Onii-sama, your cock feels so good. **** my pussy more, Onii-sama."

"You can't **** the willing Karin. From now on, you'll always be willing."

"I'm sorry Onii-sama. Fuck me all you want Onii-sama. Cum all you want Onii-sama."

Naruto took his sweet time getting her pussy accustomed to his cock, and eventually he came inside her. As cum dribbled down her thigh, she got another order.

"Try to use a lot of chakra at once. I want your collar to turn red sooner than later."

"Yes Onii-sama."

And just like that, the collar went red and she happily adjusted her outfit to better fit in as well as make serving men easier. She disposed of the bodies to protect her master's cover more than her own, then held onto his arm like a lover would.