Author's Note: If you are sensitive, then skip this chapter. If you are curious, I'll simply say that I am developing the protagonist.
The original Sukuna wanted to live normally in his next life, and Kallen is the result of that choice. Therefore, I have to give logic to a third choice.
A more mature choice than the ones Yuji offered back then.
In short, there is NTR in the protagonist's second life, and the Jujutsu Kaisen Modulo world corresponds to his third life.
…
"Yes, yes, keep going!" moaned a woman in a trembling voice.
Obscene sounds echoed through the bedroom as she slammed her hips back in response to the powerful thrusts of the large man.
The bodily fluids of the two lovers had already soaked the sheets. Nevertheless, that detail didn't matter at all.
On the contrary, the man's pace seemed to accelerate even more as he admired the woman's moans beneath him.
"Damn, I knew Lucy could be a good slut, but she still surprises me," he thought, letting out a small groan.
"Grr… y-you're filling me up~" Lucy let out as she felt Markus's fluids leaking from her pussy.
The orgasm stopped her for a moment, but Markus recovered quickly.
Far from being hindered by the heightened sensitivity of his cock after ejaculating, he flipped Lucy's body and put her in doggy style.
"W-wait, I'm still— ah~" She didn't finish her sentence before her crotch was invaded again in one rough thrust.
A hoarse moan escaped her lips as Markus firmly gripped her waist and pushed even deeper inside her.
"Stop acting like you don't like it," he mocked with a smug grin.
The woman only answered with incomprehensible, almost animalistic words.
Pleasure had clearly eroded her ability to think.
"No doubt about it, I love this kind of prim and proper housewife," he thought as he moved his hips to resume his piston-like thrusts.
"H… harder!" Lucy pleaded, clearly enjoying Markus's aggressive movements.
He grabbed the woman's ponytail and pulled her into a deep kiss.
Markus's tongue wrestled with Lucy's while his hips became rougher and rougher.
Lucy didn't stay passive against Markus's actions; she responded by synchronizing her movements with his.
The half-lidded eyes of the woman were clear to Markus.
She wanted more.
And the man intended to give it to her.
"More… bigger," she gasped as she felt her lover's cock growing even harder inside her.
**Clap!**
A sharp slap echoed on Lucy's pale ass as Markus gritted his teeth to keep from emptying his balls right away.
He didn't want to cum before her.
Fortunately, she soon began showing signs of another orgasm.
Lucy's vagina tightened irregularly around his dick while she pushed her ass back harder and harder against him.
That was all Markus needed to understand she was ready to receive his load.
"No… not there!!" The woman instinctively tried to push away the hand heading toward her clit.
However, it was too late.
Markus pinched the sensitive spot, then suddenly released the cum he had been holding back.
In response, Lucy squirted a small fountain onto the sheets.
She had cum.
"Shit, you made a mess everywhere," he said in a falsely annoyed tone.
"I… it's… too big… too good," she stammered, her eyes no longer focused.
She seemed completely lost.
"So good, huh? Your man must be a loser," he joked as he guided Lucy's face toward his cock, which was covered in a mix of cum and her juices.
Instinctively, the woman took it into her mouth and began sucking hard.
"Whew… nothing beats a cigarette after a good fuck," Markus muttered as he relaxed under the assault of Lucy's tongue.
Unfortunately, his small moment of pleasure was interrupted by a sudden noise coming from the door.
A crutch hit the floor, the sound ringing like a bell in the room.
A man was standing there.
He looked to be in his late twenties, and his face was frozen in shock.
"K… Kallen…" the woman on the bed muttered, but Markus interrupted her by shoving his cock back into her throat.
The brief moment of lucidity Lucy had shown was drowned by Markus's cum flooding her throat.
"Grr… Swallow," the man ordered as he emptied his balls down the woman's throat.
She had already started swallowing, but she continued without caring about her fiancé's return.
"L… Lucy," the man muttered, staring at an expression he never thought he would see on his woman's face.
However, the shock quickly gave way to rage.
"You bastard!" Kallen spat, his voice trembling with anger.
Despite his disability, Kallen had once been a soldier serving his country.
Aside from his army experience, Kallen had a morally questionable father.
That man had given him warnings about the dangers lurking in places as perilous as their current situation.
Even though that man was a scumbag Kallen had sworn he would never become like, he couldn't deny that his father's advice had helped him survive in the army.
One of those pieces of advice had always been: a man who cannot defend his home is worse than scum.
Kallen thought the same.
That was why he had to react!
Unfortunately, the man emptying his balls into his woman was of a similar nature to his father.
As Kallen attacked with the clear intent to kill, Markus also reacted on instinct.
He pulled a gun from his belt.
An object he never thought he would need to use here, while indulging in one of his favorite pastimes.
"Fuck, you're ruining the fun," he growled as he pulled out of Kallen's woman's mouth to better threaten the man with the revolver.
Contrary to Markus's expectations, the man in front of him didn't show a single trace of fear toward the weapon.
He had seen plenty in his life.
He shouldn't have threatened — he should have shot immediately.
**Thud.**
Kallen threw a punch at Markus's face, ignoring the injury to his leg.
The former soldier's punch was not something to underestimate; Markus's lower lip split open with a single blow.
"This guy is dangerous," Markus thought. His initial intention had been to intimidate Kallen, but he decided to pull the trigger.
He clearly couldn't win in hand-to-hand combat.
Fortunately, he hadn't dropped the gun during the initial assault.
However, he underestimated the former soldier.
Kallen quickly struck Markus in the head with his injured leg, kicking the weapon.
The unexpected move allowed Kallen to push the danger and the revolver away, but he forgot one significant factor in the bedroom.
**Bam.**
Never in his life would Kallen have thought he would die from a blow dealt by his own fiancée instead of a terrorist.
"I… I… w… why?" Kallen muttered as he looked at the wound in his abdomen.
He was already having trouble breathing.
Lucy was holding the gun he kept hidden in the drawer next to the bed.
"I… I'm sorry… sniff… honey, b… but I… I finally feel like a real woman, and your…" she said through tears.
She didn't say anything more, but the way she glanced at his legs told Kallen everything.
Anyone would be furious with rage in a moment like this, but Kallen was no longer angry.
He was… empty.
He had always believed he had managed to live a decent life, despite his humble origins.
He had chosen the U.S. Army to build starting capital, then invested in real estate with a bank loan.
Everything was going well.
He had even been waited for by his childhood friend Lucy after finishing his contract with the army.
"W… where did I go wrong?" Kallen muttered, staring at the ceiling of his bedroom.
The shadow of his alcoholic father seemed to be watching him, shaking his head in disappointment.
Unconsciously, Kallen wondered if he should have taken a more selfish path.
If he should have simply followed in his father's footsteps.
Unfortunately, it was too late.
Kallen had lost everything.
His dignity.
His honor as a former soldier.
His home.
His life.
"If… if I get another chance, I won't listen to you only halfway… dad… yeah, I won't listen to that damn pink-haired brat," he thought as he closed his eyes.
The image of a teenager looking at him with pity was his last thought.