Hatake Tatsuya in Naruto

"Hahahaha... hahahahahahaha!"

Orochimaru, in Asuma's body, couldn't contain his wild laughter upon seeing his sensei's stunned face. This was the very expression he had eagerly anticipated on his former teacher's face!

"You—who are you?!"

Unable to hold back his anger and confusion, Sarutobi Hiruzen roared out, his frustration evident as he spat words between clenched teeth.

"Why ask such a stupid question, Sarutobi-sensei?" Orochimaru, still using Asuma's voice, spread his arms in mock innocence. "It's me, Orochimaru~"

Outside the door, a shocked Sarutobi Chūnin, named Sarutobi Kenta, exclaimed, "Why is Asuma-sama fighting with his father?!"

Sarutobi Hiruzen, with a look of horror, added, "Orochimare how dare you?!"

The Sarutobi Jōnin, Sarutobi Kazuya, caught up in the commotion, shouted, "Has Orochimaru transformed himself to use Asuma's to fight?"

Hiruzen's face paled as his expression became a mix of shock and realization. His pupils narrowed as he gasped, "Could it be... you have completed that technique?!"

A distant memory resurfaced, connecting the dots of Orochimaru's malevolent plan.

This conversation took place shortly after the end of the Second Ninja World War. After the war concluded, Jiraiya returned to Konoha from the front lines. During a casual chat, Jiraiya and his master discussed Orochimaru.

Jiraiya recalled that the Sannins were on the front line, fighting the enemy and discussing their dreams. Orochimaru had declared that he had no aspirations other than learning all the ninjutsu in the world. At that time, Jiraiya had retorted, "Human life is limited; it's impossible to learn every jutsu."

Orochimaru had merely smiled and countered, "That may not be true."

Their conversation ended inconclusively, interrupted by an enemy attack.

Seeing Orochimaru now, Sarutobi Hiruzen was suddenly reminded of the disturbing technique known as "Living Corpse Reincarnation." Orochimaru, with a chilling smile, revealed the name of his ultimate Forbidden Technique.

"It's a remarkable Jutsu, isn't it? Sensei," Orochimaru said. "Thanks to Asuma-kun's assistance, I've gained a new lease on life. Although he resisted fiercely at first, in front of my years of effort have allowed me to transform his body until it perfectly vessel that velds with mine."

As he spoke, Orochimaru raised his arm, admiring his handiwork. He knew that if the target of the Living Corpse Reincarnation resisted, the reincarnation ceremony could become extremely dangerous.

In response to this weakness, Orochimaru developed the curse seal. This technique not only granted the target the power of Sage chakra but also allowed Orochimaru to infuse his chakra into the vessel's body. The ultimate goal was to achieve deep assimilation, making the target's body increasingly compatible with his chakra. Over time, as the curse seal progressively altered the target's body, it minimized the risks of the reincarnation ceremony, ensuring a smoother transition for Orochimaru.

When Tatsuya learned of this, he couldn't help but admire Orochimaru's ingenuity. In terms of developing forbidden jutsu, only the Second Hokage could be considered more talented. However, Tatsuya mused that perhaps in the future, Orochimaru might surpass even him.

"You damn monster!!!" Sarutobi Hiruzen's fury reached its peak as he roared at Orochimaru.

"Fire Style: Ashes Burn!" Orochimaru's smile remained unfazed as he performed a series of hand signs and unleashed a cloud of scorching ash, temporarily obscuring Sarutobi Hiruzen's view.

Seeing Orochimaru use the signature jutsu of the Sarutobi clan, Hiruzen's anger flared even more. He summoned his Monkey King: Enma and shouted, "I'm going to kill you, Orochimaru!!!"

With his Adamantine Staff in hand, Sarutobi Hiruzen charged through the hot ashes, his face set in fierce determination.

"Follow Hokage-sama!" Sarutobi Kazuya shouted urgently.

Hundreds of ninjas from the Sarutobi and Shimura families surged forward to join the fight. Even Orochimaru, confronted with such a massive scale of encirclement and suppression, could not help but feel a sense of helplessness.

"Hehe, the only one dying today will be you, teacher. Not just you—your entire family will be buried with you."

Orochimaru suddenly unleashed the Great Fireball Technique into the sky. Although it wasn't a massive fireball, it traced a bright orange-red arc across the night sky.

Sarutobi Hiruzen, unsure of Orochimaru's exact intentions, felt a deep, instinctive sense of dread.

...

...

"Huh? Has he started already? That guy…" 

Tatsuya, standing in the courtyard of the Senju clan, noticed the fiery arc streaking across the night sky. He turned and shouted to Rin and Terumi Mei inside the house, "Rin, Mei, let's go!"

"Right away, Master Tatsuya," Nohara Rin replied as she poured a glass of milk from the refrigerator. Drinking one cup each morning, afternoon, and evening was a habit she had maintained for years.

"Rin, aren't you overdoing it?" Terumi Mei teased.

"Hmph! Well, then you shouldn't drink it!" Rin pouted, clearly annoyed. She knew very well that Mei, with her shameless D-cup figure, was also drinking it.

Terumi Mei's face turned red as she snatched the cup from Rin's hand, gulped it down, and thought, 'D-cup isn't enough—my goal is to match Tsunade's G-cup tank!'

"Mei, do you feel a bit weird after drinking this milk?" Rin suddenly asked, her expression showing discomfort as if she were slightly tipsy.

"Hmm?" Terumi Mei, who had just finished her cup, smacked her lips thoughtfully. "Yeah, it feels a bit too sweet…"

She soon realized something was amiss with her body.

...

...

Two minutes later, Tatsuya, who had been waiting outside, could no longer bear it and walked into the room. Had they been drinking milk for so long? He was aware of the trio's peculiar habit over the years, especially since Tsunade and he lived here too. The habit was not unusual for them.

But what he saw as he entered Rin's room was shocking. The two girls, their faces flushed, were holding his unwashed practice clothes from earlier in the day and twisting them in front of their noses.

Tatsuya felt like he had walked into a bizarre alternate reality. 

"Master Tatsuya, we're so uncomfortable…" Rin complained, her voice tinged with seduction.

"It's unbearably hot…" Mei added, squirming as she tried to ease the discomfort by removing her clothes.

Seeing Tatsuya's bewildered expression, both girls clung to his arms—one on the left, the other on the right.

Tatsuya was caught off guard. This was nothing like the over-the-top shounen guy he'd seen in every romance manga, where the heroine gets drugged by mistake, and the harem protagonist has to overcome his shyness or run away to save himself from the out-of-control heroine. Every time he encountered such ridiculous tropes in his past life, he wanted to give the authors a serious talking-to.

He swore to himself that if he ever found himself in a similar situation, he would never become that kind of clichéd harem protagonist.