This is an English translation of the original Japanese novel, processed through a translation tool.
There may be some inaccuracies.

Link to part 1
https://privatter.me/page/67d4f02a7a149

Drawing on his memory of how his video-self had tormented Lucifer, Alastor touched his body.
Guided by the man’s hands, Alastor roughly ravaged Lucifer’s flesh.
Just as Alastor sought the voice of the video-Lucifer, Lucifer seemed to crave the hands of the video-Alastor.
Without a word, Alastor gently intertwined his hand with Lucifer’s cold one.
His sweaty, heated fingertips clung to Lucifer’s slender, graceful fingers.
…If he recalled correctly, one hand had kept caressing while the other held Lucifer’s palm, enveloping it entirely.
So that his warmth would reach him.
He squeezed slowly, with care.
Tears welled up in Lucifer’s eyes.
"Haa, ah, ahh… ♡"
A sweet voice spilled from Lucifer’s lips.
Alastor leaned closer to his head, not wanting to miss a single sound.
Feeling awkward about meeting the teary, swollen eyes of the crying man, he avoided his gaze, instead pressing a soft kiss to his ear.
"Ah… n, haa… ♡ I want it all… everything… ♡"
"…Haa… You’re… really a greedy one, aren’t you? Don’t people tell you that?"
"Alastor… haa, ah… ♡ More, do that more… ha, is that okay…?"
"…Like this?"
"Ah, ah… there… ♡ …Ah, haa, ngu… ♡♡ Good… so good… ♡ It feels, so good… ♡♡"
"…Ahh. Here, right… Got it. So you want me to do this here, like this?"
"Haa! Ahh!! ♡ Y-yes… ♡♡ T-that… ♡♡ When you grind the tip, it feels so good, my head goes fuzzy… ♡ Ah, ahh… ♡♡"
"…And then, touching here with my hand… Oh, I see. That’s why this spot’s your weakness. It puts you in a position where you can’t resist…"
"Haa! Ahh! ♡ …Again, I’m gonna cum again… ♡♡ Alastor… ah, ahh… ahhh…!! ♡♡"
…Maybe we’re just conveniently projecting the versions of ourselves from that video onto the man in front of us.
"That future is inevitable."
Using that as an excuse, maybe we’re just committing a mistake.
But the closer this absurd scene unfolding before him resembled that video, the more it felt like puzzle pieces slotting perfectly into place. The act of touching him, skin on skin, began to feel comforting.
He wanted to touch the man before him gently.
…Even though he didn’t particularly love him.
As he continued moving his hips slowly, his cock seemed to graze Lucifer’s sweet spot, causing the man’s small frame to arch like a bow.
Noticing the reaction, Alastor angled himself precisely, relentlessly pressing into that weak point.
"Ohh, oah…!! ♡ W-wait!! ♡♡ Haa, there, no way!! ♡ Ah! It’s coming, I’m cumming!! ♡♡"
"…Cum. Go ahead. …No one’s watching but me… Let yourself feel good."
"…!! ♡♡ Ah, ahhh!! ♡♡"
Lucifer’s body stiffened in climax, but Alastor didn’t care. He kept thrusting even harder into him.
Lucifer’s ass swallowed him to the hilt, stretching and distorting.
Alastor watched keenly as Lucifer’s greedy body accepted every bit of pleasure.
His cock rubbed against the warm, slick walls, now a mess from Lucifer’s climax. The spasming stimulation heightened his arousal.
…He was starting to accept the pleasure of sex—something he’d once found repulsive—as a means to fuel his sense of superiority and domination. It felt like dabbling in a dangerous drug.
While he ravaged Lucifer’s body with his own hands, Alastor himself was being warped, mentally and physically, by embracing him.
"Damn it…"
Licking his lips, Alastor placed a hand on Lucifer’s neck.
The skin there had flushed red with excitement. Deliberately, he dug his red claws in, drawing golden blood from the pale flesh.
A sweet sigh escaped Lucifer’s lips.
Pleased by the reaction, Alastor unconsciously tightened his grip.
"Haa, ah, ahh… ♡♡"
Even as he squeezed the slender neck tightly, Lucifer trembled beneath him, moaning sweetly. He was likely turning even this pain into pleasure.
Perhaps that’s why Alastor—someone unafraid to wield harshness—had been chosen as his partner.
How their future selves ended up in that relationship was irrelevant now.
All he wanted was to devour the exquisite prey before him with his own hands.
"Fuu, ugh… nn!! Ah, ahh ♡ Nguu!! ♡♡ So deep, it’s deep… ♡♡ Ahhh!! Ah, ugh…!! ♡♡"
"…I want to ruin you even more… This feeling, it’s a first for me."
"Haha… ♡ You… didn’t you say you’d never had sex? ♡ Poor thing. Nn, haa… Your first time turning out like this… ♡ Normal play won’t satisfy you anymore, will it? It’s too late to turn back… ♡♡"
"Yeah… it’s the worst feeling. And it’s all because you suggested we watch that weird video together. You’re going to take responsibility for driving me crazy—with your body!"
"Higu!! …Nn, haa, ahhh!! ♡♡ Hii, i-it’s good… ♡♡ Feels, feels so good…!! ♡♡ Haa, ah, ahhh…! ♡♡"
The joy of tormenting and violating a man stronger than him with his own hands.
Hunting down prey and feasting on its flesh and blood—an act he’d cherished even in life—paled in comparison to this. His blood boiled hotter than ever before.
Facing this prime catch, his excitement soared to its peak.
"Haa, ah ♡"
"This… this is what you wanted, isn’t it? Lucifer…"
"Nn ♡ Ah, haa… Feels good… ♡♡ This, this is it… ♡"
…Yes.
Accept me. All of me.
I’ll devour every last piece of you.
He must have been too exhilarated, losing himself.
Suddenly craving a kiss, he grabbed Lucifer’s upper jaw roughly and sealed the man’s dry lips with his own.
"Ngu… ♡ Haa, ah… ♡♡ I love kisses… ♡ Nn, chu…"
Lucifer shifted angles, sliding his tongue through the gaps in Alastor’s teeth, meeting his rough kiss with fervor. What started as a simple press of lips quickly deepened into a passionate exchange, tongues entwining and saliva mingling.
"Nfu… nn, ngh… ugh ♡ Puhaa… ♡♡"
"Haa… fuu, nn…"
With an ecstatic expression, Lucifer accepted the pleasure Alastor gave him.
After climaxing repeatedly, his voice had turned sweet and broken—almost identical to the one in the video.
Was this the "thoughtless state" he’d spoken of?
This must be it—the peak of pleasure where Lucifer bared everything to feel good. If he truly craved this state, he’d need someone to serve him.
Self-pleasure couldn’t surrender his entire heart. The unique comfort born from intense communication was what he truly desired.
…Only then did Alastor fully realize it.
Right now—heart, body, every inch—he was dominating all of Lucifer.
"Haa, ahh… ♡♡ Alastor… ♡ It feels good… so good… ♡♡♡"
"Damn it… Lucifer…!"
His chest burned.
A euphoria he’d never felt before.
Lucifer was entrusting his hands with the softest parts of his body and soul.
It was strange.
Despite ravaging him so brutally, Lucifer had stripped himself bare—physically and emotionally—surrendering everything to Alastor.
And Alastor found himself glad for it, even though he wanted to beat the man to death.
So, to stop thinking further, he relentlessly pounded into Lucifer’s body with his cock.
"I’m cumming!! It’s coming… haa, ahh ♡!! Wait, ah, ahhh…!! ♡♡"
"Cum already… you shameless slut…!!"
"Ohh!! ♡♡ I’m breaking!! It’s coming, really!! ♡♡ I’m cumming, cumming!! ♡♡ Ah, ahh… gii, hiiii!! ♡♡ Cumming!! Breaking, nn, ngh ♡♡ Ahhh!!! ♡♡"
Overwhelmed by an especially intense wave of climax, Lucifer’s body convulsed.
Alastor hurriedly extended more tentacles to support him.
"Haa… haa… ♡♡ Haa, ahh… ♡"
"Lucifer… you okay?"
Since Lucifer had climaxed first and gone limp, Alastor missed the timing to finish inside him, ultimately not releasing within.
But the unprecedented triumph of subjugating a powerful being with his own body filled his parched heart with a bursting sense of achievement and satisfaction.
As Lucifer regained his breath and awareness from the waves of pleasure, their eyes met.
What Alastor saw in his expression was calm.
"…Thank you…"
With that, seemingly satisfied, Lucifer closed his eyes in Alastor’s arms and drifted into sleep.