Chapter 15: Chapter 15: Forbidden Desire (R18)

"You got a little bit taller." Tsunade commented after finishing washing his back.

"Serious?" Nawaki hadn't realized that. He didn't feel he had grown in size.

"Yea." She tapped her lips with her finger and thought for a moment before smiling: About an inch in the last 3 days."

"All this?" Nawaki could only trust his older sister's words. He had no way of measuring his size to know if he had grown or not.

The last time his size was measured, he was 133.4 cm. If he's grown another 4 cm, then he should be 137.4 cm.

Although he hadn't bothered much before with his height, he was a little short. Even though he wasn't the lowest of his class at the ninja academy, he wasn't even average. The average should be around 140 to 145 cm by age 11.

He was a head shorter than Tsunade who was just over 160 cm tall.

Now that he stood in front of her, he realized that he had indeed grown, as his head was hitting her breasts, and the top of his head almost reached his older sister's chin.

Tsunade headed towards the hot spring first. Nawaki watched the sway of her firm, round cheeks and caught a quick glimpse of her naked pussy as she lifted her right foot as she entered the water.

It wasn't the first time he'd seen her naked, but it still caused a reaction, especially when he got the wider view of her naked pussy.

Taking a deep breath, he walked to the hot spring and entered.

He didn't know if she saw his erection or not, as she only glanced in his direction as he was stepping into the water, but made no comment.

"How are you feeling?" Tsunade asked.

The hot water mist didn't fully hide her body in the water, Nawaki saw more than enough for his erection to continue as he looked at her. When he heard the question she asked, his response was sort of with a deep breath, almost as if he had run: "I... I feel great."

"Mm." She smiled gently with her eyes closed, then she opened her eyes: "These orbs are very miraculous. The result I had today was more than I would have had if I had trained for months."

"I must agree to that." Nawaki said and gave his classic smile, "I don't know exactly how strong I am these days, but I must be stronger than most Chuunin."

Tsunade added, "In general, yes. But chakra alone, you have more than many Jounin."

But having a lot of chakra doesn't determine a ninja's strength.

Saying that, Tsunade stopped talking.

She leans with both arms outstretched on the ledge of the hot spring and throws her head back with her eyes closed. She kept a happy smile on her face doing this. She seemed to enjoy having a hot bath.

Nawaki couldn't help but look. He can't get enough of the sight of his big sister's voluptuous body, and sees her big, firm breasts floating in the water. It was too exciting!

When his erection starts to ache, Nawaki forces himself to look away. If he kept looking at her, he might not take it anymore and end up jerking off right there.

- -

On the way to the ninja academy, Nawaki used his newly acquired ability to control the wind. When he did this, his speed increased at least 30-40% faster than before.

"Youth, I am super fast!" It was inevitable for him to think back to his earlier life when he was a grandpa who got tired quickly when running. Now, he was running as fast as a leopard.

People in the village were surprised wherever he passed.

Sometimes his figure seemed to disappear and reappear in the distance.

Before long he reached the ninja academy.

Because he ran all the way, he was one of the first to arrive. Entering, he went to the classroom and saw that in addition to five other students, Mikoto next to Hikari Hyuga were standing by the window.

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"Nawaki." Mikoto stopped talking to Hikari and said to Nawaki, "Good morning, I'm looking forward to today after school." She winked at him with a gentle smile.

"Mm, likewise." He returned his classic smile.

- -

It's been 1 week since Nawaki continued the same routine of going to the ninja academy, hunting in the hunting dimension, training with Mikoto, meditating and showering with Tsunade every day.

Nawaki was also almost every day sending energy from the orbs to his younger brother.

Tsunade pretended not to notice the growth, but she looked more often at his crotch.

It was late afternoon and Nawaki was training with Mikoto as usual.

On this particular day, Tsunade found herself alone in the Senju Clan with ample opportunity to satisfy her needs while her adorable little brother was training with a friend from the ninja academy. Deciding to make the most of the chance to indulge in some self-gratification and lustful imagery, she went to his room to stretch out on the bed.

She quickly pulled the shirt over her chest, exposing her overflowing bra and luscious breasts. Then she slid her hands down and unbuttoned her jeans, revealing her thin cotton panties, which had already begun to dampen in anticipation of the attention about to be received.

Tsunade then moved her hands back to her breasts and began to gently rub herself against the lace of her bra. Her nipples instantly hardened at his touch, and she instinctively began to pinch them cautiously, letting out a soft sigh of satisfaction in the process. It didn't take long for her to begin her erotic fantasy as her hands explored her chest.

She let out a low moan as she imagined Nawaki's tongue running over her rock-hard nipples, her lips covering her heaving breasts. Pulling her bra down her chest, she released her impressive melons and began squeezing them even tighter. Her pussy ached to be touched as she continued to imagine her fantasy lover pleasuring her big breasts.

Her right hand went down her body and made its way between her legs. Slowly, she began to rub her swollen pussy lips through the thin cotton. Moaning as he ran a finger over the contour of her pussy, she shivered with anticipation.

Unable to deny herself the pleasure she craved so desperately any longer, she slipped her hand under the waistband of her quickly dampened panties. She gently eased her middle finger into the heat of her desire and sighed deeply.

With her left hand continuing to pinch and tug at her rock hard nipples, and her right hand slowly stroking her finger in and out of her hungry pussy, her thoughts continued to be on her adorable little brother and smelling him in bed only increased the stimulus.

In her mind, she replaced her finger with Nawaki's tongue, imagining him sliding up and down and in and out of her wet pussy. She whimpered in pleasure as her finger's speed increased in proportion to her imaginary scenario.

Squeezing her eyes tightly shut, Tsunade began to fantasize about his cock, dreaming of how it had grown, and thinking about what it would be like to wrap her lips around it. Imagining herself on her knees in front of him, his hands gripping her hair as she sucked his cock, she squeezed the aching nipple so hard she let out an involuntary gasp of pain.

She imagined running her tongue up and down his shaft as she slid another finger inside her burning pussy.

Her pussy throbbed and her breath got faster and faster with the fantasy of being with Nawaki. But she wasn't thinking about making love to him, she was imagining fucking him, hard and dirty.

She furiously pumped her fingers as she visualized his cock sliding into her aroused pussy. Her body shook as if she could actually feel him inside her.

She inhaled deeply when she saw him fucking her, his hand working faster and faster between her legs. Desperate for an orgasm, she imagined giving herself to him to be used like a common whore, begging him to fuck her like a cheap whore.

Tsunade's frantic masturbation consumed her completely as she feverishly sought her sexual release. She could feel the rash growing on her hot, wet pussy as he groped at her breasts and caressed her fuck-hole at an ever-increasing pace.

The bed creaked in rhythm with her maniacal movements as the fantasy of having sex with her little brother completely took over. She began to moan in pre-orgasmic pleasure as she reveled in the thought of fucking Nawaki like a dirty whore. With that, her body convulsed in a shudder that went from her toes to the top of her head. Her long-awaited climax swamped her as her entire body ignited in a flame of lust.

She closed her eyes tightly as she began to descend from one of the most mind-blowing orgasms in her life. The anticipated pang of guilt...

Reality was a bitch, after she finally had her orgasm, a sense of guilt and shame all came together. She felt dirty and disgusting to have that kind of fantasy about her little brother, but it was just hard. She had never had a man before, although she had masturbated before, it was the first time the man in her fantasy had a face and... It was her little brother's face.

'Heavens, I'm freaking out…' Tsunade put both hands on her face in an attempt to hide her face as she closed her eyes.

She smelled the strong scent of sex, she had even forgotten that just now she came hard in her hand...

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