Upon transmigrating to the Shinobi World, alongside the "cheat" of the Flower-Flower Fruit, Saiki possessed a core of Pre-natal Qi within him. As long as he diligently cultivated it, he could theoretically step onto the Daoist path, achieving longevity and perhaps even ascending to true immortality.
However, the Shinobi World completely lacked any actual Xianxia cultivation techniques. Saiki was essentially forced to figure it out on his own, like a minor demon relying purely on instinct and luck.
While his previous method of absorbing natural energy and the essence of the sun and moon was a viable path to the Dao, the exact moment Tsunade used her body to break her own purity against his weapon—forging a profound, intimate physical connection—Saiki's cultivation path shifted. He didn't lose the ability to absorb natural energy, but this new path of "Dual Cultivation" (双修) promised far more rapid progression.
Just as Tsunade had read in the forbidden scrolls, despite the agonizing pain of her purity being torn open by Saiki, she immediately sensed the surge of chakra transferring from his "weapon" directly into her core.
That foreign chakra flowed through her own meridian network, completing a full, purifying circulation before returning to Saiki's body.
That single circulation of chakra left Tsunade feeling as though something profound had been added to her body, yet simultaneously, something had been taken away.
In Daoist terminology, Tsunade was receiving Yang Qi while expelling Yin Qi, whereas Saiki was expelling Yang Qi and receiving Yin Qi. As the primordial Qi flowed through their internal organs, dividing into the Five Elements before unifying once more, a fresh surge of pure vitality—or in this world's terms, chakra—was generated within both of them.
Although it was only a small wisp of chakra and a single, minor circulation cycle, the terrifying, boiling heat radiating from Saiki's body ceased its upward climb. Simultaneously, Tsunade felt a comforting, soothing warmth spreading throughout her entire being.
"Mm." Tsunade had initially thought that simply sitting there would be enough to maintain the flow, but after a single cycle, the transfer abruptly stopped.
Not to mention her Yin Seal, even if her baseline constitution was far inferior to Hashirama's, the Senju clan's inherent regenerative abilities were formidable. The sharp pain from losing her virginity to Saiki faded remarkably quickly.
Seeing that the rampaging chakra had stopped circulating on its own, Tsunade gritted her teeth, lifted her plump hips slightly, and then sank back down.
Although it was an incredibly simple, straightforward motion, Tsunade couldn't suppress a soft, breathy moan.
She bit down hard on her pink lower lip, desperately trying to stifle the embarrassing sounds she was making. She never expected her body to be so incredibly sensitive. The slight twinge of residual pain, combined with a sudden, overwhelming wave of tingling, numbing pleasure shooting straight to her brain, was almost too much for her to handle.
Being a virgin in her thirties... you truly couldn't blame her.
While other women reached the peak of their sexual prime by thirty, she had spent her entire life untouched. It would be a miracle if she wasn't hyper-sensitive.
To claim Tsunade had never "soothed" herself manually would be a lie. Even with a ninja's incredible self-discipline, reaching a certain age naturally brought curiosity and exploration; it was a primal instinct hardcoded into human DNA.
After only a few slow thrusts, Tsunade was already feeling overwhelmed. This was partly due to her extreme sensitivity, and partly due to Saiki's sheer, intimidating size—which was far, far beyond what any child his age should possess.
Perhaps it was destined by fate that Saiki would walk the path of Dual Cultivation.
As Tsunade rhythmically rose and fell, Saiki's weapon was subjected to the tight, squeezing embrace of her body. Another surge of chakra flowed from him, completed a circulation cycle within Tsunade, and returned to his core.
"You damn, filthy brat!" Everything was technically her own fault, but having to actively move to trigger Saiki's body into transferring the chakra made Tsunade flush with embarrassment and frustration. The biological "trigger condition" felt incredibly lewd.
Despite cursing him in her mind, Tsunade kept her hands planted firmly on his lower abdomen, maintaining a steady, shallow rhythm of rising and falling.
Her words might have been harsh, but her body was undeniably honest. As Saiki's chakra continuously circulated through her, her body temperature began to rise, and the "valley" between her thighs grew increasingly slick and damp. Without even realizing it, the amplitude and speed of her thrusts began to increase, and soft, uncontrollable moans began escaping her lips.
Just as Tsunade let out an involuntary gasp of pleasure, the previously unconscious Saiki let out a low, muffled groan of his own. Clearly, even in his comatose state, his brain was registering the intense physical pleasure and satisfaction radiating from his lower half. However, he still showed no signs of waking up.
Within his dreamscape, Saiki was finally able to progress his fantasy.
Because Saiki had clearly seen Tsunade's massive "white rabbits" in reality, the dream-Tsunade had stripped off her top, exposing them fully to his gaze.
However, since he had only caught a fleeting, blurry glimpse of her "valley," the corresponding imagery in his dream remained equally vague and indistinct.
As for the moment Tsunade had guided his weapon and sat down upon it... in his dream, Saiki had only felt the sensation of her "steamed bun and sausage" treatment from that morning. He hadn't felt the actual sensation of true penetration, so the dream simply couldn't progress any further.
It was exactly like a virgin having a wet dream; they might manage to strip the woman naked in their mind, but the moment they try to pounce, they wake up having already finished.
An experienced man, however, could battle a woman for three hundred rounds in a dream before finally waking up.
Now, with Tsunade actively riding him in the real world, the intense, genuine physical stimulation pierced through to his subconscious, allowing the dream-Saiki to finally continue his fantasy.
Because Tsunade was providing the "service" live and in person, the dream-Saiki experienced the exact same mind-melting sensations.
Spurred on by her own vigorous movements, and seeing that Saiki was finally reacting, the decades of suppressed desire within Tsunade—combined with the overwhelming waves of pleasure and aching need crashing through her—left her craving more. She completely forgot the sheer impropriety of what she was doing with him.
Now, seeing Saiki respond, Tsunade felt as if she were being actively encouraged. She threw herself into the act with renewed vigor, performing deep, punishing squats. She sank so low that her plump, firm buttocks actually slapped audibly against Saiki's thighs, the loud smack, smack of flesh colliding filling the silent room.
With every rapid descent, as the chakra cycled between them, waves of intense, euphoric pleasure continuously bombarded Tsunade's brain. Her initial hesitation and shame evaporated entirely. The sensation, which felt as though it could elevate her straight to heaven, began to cloud her rational thought completely.
As her legs pumped tirelessly, Tsunade's hands instinctively left his abdomen to caress his muscular chest. Eventually, she proactively grabbed Saiki's hands and pressed them firmly against the massive "white rabbits" that had "washed his face" so many times before.
For a time, the room echoed with the unrestrained, passionate moans of a woman, occasionally punctuated by the muffled, guttural grunts of a teenage boy.
In the beginning, Saiki's immense size had far exceeded Tsunade's expectations, subjecting the older, yet entirely inexperienced woman to an agonizing, tearing pain.
However, that agony was fleeting. Tsunade quickly adapted to his scale and began her vigorous, rhythmic ride.
The unconscious Saiki was essentially a wooden log; Tsunade had to do all the work herself. The "cowgirl" position was currently the only viable option.
Setting aside the taboo nature of their relationship, there had been zero foreplay. Furthermore, with the man lying completely motionless, the act felt uncomfortably close to necrophilia—a deeply unsatisfying dynamic for the woman involved.
If this hadn't been an absolute necessity to save his life, Tsunade would have never, ever agreed to it.
But Saiki's unique constitution shattered all of Tsunade's expectations. The potent chakra cycling between them, the forbidden nature of their bond, and the sheer absurdity of an elder engaging in such an act with a youth actually fueled a dark, rebellious sense of satisfaction within her.