Scene features at least 1 girl fully nude.
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Rating: 4
Influenced by Akashi, Sekai and Ushio briefly have a lesbian threesome with Domeki.
But the MC quickly joins in as well and the rest of the scene remains an orgy with him involved.
There’s a few colored pages of the orgy part of this scene back in Chapter 41.
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Rating: 3
In the final chapter, Dae-Un gropes every girl in the group before joining the MC for an orgy.
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Rating: 4
The MC has an orgy with all 4 of the girls in the club and their advisor/teacher.
At one point, a few of the girls briefly break off to have lesbian sex with each other, but they quickly invite the MC back in.
This chapter has an official translation that you’ll have to look around to find.