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

The next day, and the day after that, Alastor and Lucifer avoided eye contact even when they crossed paths in the hotel lobby.
No—they couldn’t meet each other’s gaze.
If their eyes met and words were exchanged… they’d inevitably recall that night.
Unable to bear the awkward silence any longer, on the third day, Lucifer approached Alastor on his way back to his room.
In his hand was the cursed DVD from the future—the root of all this chaos.
"This video… could you hold onto it?"
"…You want me to dispose of it?"
"You can dispose of it or not, I don’t care… I just… can’t destroy it with my own hands…"
"…"
"That’s all. …Starting tomorrow, let’s act normal with each other."
"…"
With that, Lucifer used magic to vanish before Alastor’s eyes.
In other words, the future of their relationship now rested entirely in Alastor’s hands.
If he destroyed the DVD and pretended nothing happened, he could return to his usual routine.
…But what about Lucifer?
Could he erase this incident and go back to normal in his current state?
The act of dominating the King of Hell with his own hands had been an unbearably sweet experience for Alastor too.
Since the video came from the future, their eventual romance was already set in stone.
The temptation to use that as an excuse to continue this relationship—to keep experiencing Lucifer’s body—made the DVD feel like a devil’s lure.
"I mocked him for drowning in pleasure, calling it pathetic… but now that I’m here, I can’t laugh anymore…"
Alastor would agonize and wrestle with this until the very end.
Should he really tell Lucifer he wanted to dominate him again?
Would he be the one to speak first, or would it be Lucifer, who’d entrusted him with the DVD?
He knew the truth.
Neither of them could resist this temptation.

…Pandora’s box had been opened.
They could never return to the innocent days of bickering.
Having confirmed with their bodies that the video was real, no matter how frantically they tried to close the lid and pretend otherwise—
They could never go back.