The scene takes place while the girls involved are taking a shower or bath.
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Rating: 5
The MC has an orgy with every girl that’s appeared in the series.
At 1 point, Yuzu and Rio go have lesbian sex with each other.
At the same time, the 2 coworkers from Ch. 5 have lesbian sex with Ayumu.
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Rating: 4
While the MC is having sex with Shieri, Rin and Ann briefly join in by groping Shieri.
While they’re sucking on her breasts, 1 of them mentions how they did this all the time in the past, implying they’ve had lesbian threesomes before.
Eventually Rin and Ann stop to just have lesbian sex with each other in the background.
So I’m gonna tag this as Male Involved, but the MC doesn’t do anything with Rin and Ann after they leave to have lesbian sex.
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Rating: 2
So-Jung and So-Won’s tongues accidentally touch each other’s while they’re giving the MC a blowjob.
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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.