It's just their game-6 (Pixiv Fanbox)

Reisen(Suprised): Hmmm...this is indeed a scene I have never seen before. Houraisan Kaguya: Why are you excited? Reisen: No...no such thing...just a little...frightened? Is Reisen dead? Oh...my statement sounds weird... Houraisan Kaguya: Suddenly timid again...but don't worry, Eirin has a way to save her, and you know, Eirin can't be killed. Reisen: Phew...that's not bad. Houraisan Kaguya(Smile): You seem to have been concerned about Reisen's body from the very beginning. How do you feel? Very sexy, right? Reisen: Whoa...I didn't... Houraisan Kaguya(Step forward): Your expression betrays what you're thinking, you don't need to be embarrassed, it's nothing, and you can be as sexy as she is. Reisen(Looking at the rope): You mean? Houraisan Kaguya: What do you think? Reisen(Kneading her neck): I think... Houraisan Kaguya: You think? Reisen(Kneel): Ok, but please don't let me die. Houraisan Kaguya: Don't worry~ Reisen(Eyes closed): Do it... Houraisan Kaguya: Take it easy. Reisen: ...Uhhhhhhhh! [Reisen and Reisen will experience the same comfort~]