The scene takes place while the girls involved are taking a shower or bath.
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Rating: 5
While taking a shower together, Mihori seduces and has lesbian sex with Natsuki.
Near the end of the scene, Mihori asks to continue in her room, and it’s implied they keep having sex off-screen, which we see a little bit of next chapter.
Natsuki calls Mihori “Nee-san,” but they’re related through marriage, not by blood, so I won’t tag this as Incest.
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Rating: 4
At the start of the chapters, while Erika and Ai are taking a bath together, Erika starts groping Ai’s breasts.
After the bath, Erika and Emma watch as the MC has a threesome with Mei and Ai. Near the end, Mei briefly makes out with Emma while still having sex with the MC.
The rest of the chapter is the MC having an orgy with all 4 of them.
At one point, Ai puts on a strap-on to have sex with the other girls.
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Rating: 5
At the start of the chapter, Nami and Yumi reminisce about how they used to have sex with each other all the time back in high school.
Since they just had their first threesome together, they talk about how they should go back to how they were in those days. So they start making out in a park, and then go home to have sex with each other for the rest of the chapter.