It's just their game-5 (Pixiv Fanbox)

Houraisan Kaguya(Smile): So beautiful...Eirin, you are so beautiful now, of course you were also very beautiful before. Reisen Udongein Inaba: Kaguya Sama? Houraisan Kaguya: Ala~ Reisen Udongein Inaba(Frightened): What happend?! Houraisan Kaguya: Nothing, we just did something fun. Reisen Udongein Inaba(Step forward): We'd better put her down quickly... Houraisan Kaguya: Don't worry, do you want to be very beautiful too? Reisen Udongein Inaba: If Kaguya Sama want me to hang myself, I'll do it, but I can't revive... Houraisan Kaguya: Eirin will save you, hanging is very comfortable, you'll miss it when you're put down, you'll get hooked on this feeling. Reisen Udongein Inaba(Standing on a stool): ...As you wish. Houraisan Kaguya: That's it, please stand still. Reisen Udongein Inaba: I'm ready, Kaguya Sama. Houraisan Kaguya(Excited)：You are wonderful tonight. Reisen Udongein Inaba(Nervous): Please... Houraisan Kaguya(Move aside)：Kick off the stool yourself. Reisen Udongein Inaba(Accident): Ok...Uhhhhhhhh! [When Reisen is revive, she finds that Kaguya is right~]