At least one of the girls involved in the scene is a teacher at a school/university/college.
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Rating: 4
At the start of Ch. 20, it’s revealed that the mother had started sexually training the teacher off-screen by having lesbian sex with her.
The scene then progresses into the MC having a threesome with both of them.
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Rating: 1
After the threesome from last chapter, the teacher and sister are briefly seen cuddling with each other.
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Rating: 3
The MC has a threesome with 1 of the sisters and his teacher.
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Rating: 2
At the start of the chapter, Kuguri briefly gropes Hiyori when showing off her body, explaining that jump rope would be more efficient with less clothing.
Later, Yuki briefly gropes Hiyori’s breasts again.
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Rating: 4
While Makoto is giving a massage to Masami, the MC overhears them and because of how erotic it sounds, begins to imagine them having lesbian sex.
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Rating: 1
Miya and Eri briefly grope Makoto’s breasts while they’re taking a bath.
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Rating: 3
The MC has an orgy with Eun-Jung, Sae-Yeon, Su-Hyun and Hyun-Mi.
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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: 3
Basara has a threesome with Hasegawa and Zest.
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Rating: 1
While Celis is taking a bath with Hasegawa, she can’t help but be mesmerized by her nude body.