found it on the way-back machine!!, I think its referring to this reading of the manga on their website, It seems to line up with whats happening in the manga so I think its the right place! (it seems to originally be from an extra in vol2 that hasn't been translated yet)
Website >
https://web.archive.org/web/20230323225329/https://mfbunkoj.jp/special/kurakon/#mousou
Video >
I gotchu...
"Sorry to keep you waiting. We finally get to sleep together..."
"Yeah, we finally get to sleep together...wait... the heck are you saying!?"
"It makes me the happiest when I get to plop into bed with you, Saito."
"Are you okay!? Did you eat something strange!?"
"If I had to say... I ate a whole lot of your love... just kidding. Kya!"
"Did you finally break!? Be healed! Be heeealed!"
"Sheesh. Quit saying silly things. Hurry up and stick out your arm."
"What do you plan on doing with my arm?"
"You're always letting me sleep on your arm, aren't you?"
"I have been doing absolutely no such thing! Who is that!? Rather, who are
you!?"
"I'm Akane, your wife!"
"My!? Wife!?"
"If Akane's body-swapped with an alien, there should be antennae somewhere around here..."
"If you pet me that much...I'll end up in that mood!"
"That...that mood!?"
"You get it, don't you?"
"Don't rush into things!"
"I'm not rushing into anything. For married couples, isn't it a given that you make babies at night?"
"You and I are not in that kind of relationship, though!?"
"Sorry... I messed up."
"I'm glad you realize now. Whew."
"Saito, you wanted to undo my buttons, didn't you?"
"Wroooong!"
"Treat me gently..."
"Strange... this is... obviously a dream..."
"Seeeee, it was a dream after all! Do I want to do that sort of thing with Akane!? Is that my hidden desire!? I wanna disappear!"
"Saito... good morning. I'll make breakfast right away."
<stabbed by feelings of guilt>
"I apologize with every fiber of my being!"