At least one of the girls involved in the scene is a teacher at a school/university/college.
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Rating: 4
The MC has a threesome with Minnie and Mrs. Han.
When Mrs. Han goes to grope Minnie’s breasts, Minnie claims to not like being touched by a woman, but gets very turned on by everything Mrs. Han does to her.
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Rating: 3
The MC has sex with Remi, Shion and Karen-sensei.
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Rating: 4
The MC has a threesome with Remi and Karen-sensei.
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Rating: 5
Shion has sex with Karen-sensei in order to distract her and take down her barrier, allowing Remi to have sex with the MC.
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Rating: 2
In the review chapter, the author talks about the relationships between Na-Yeon, Yeon-Ah and Soo-Yeon and the reasonings for lesbian sex in the series.
He shows off a diagram of his ideal harem relationship, which is for the girls to be involved with each other as well as the MC. This prompts Yeon-Ah to break the 4th wall, saying that Na-Yeon and Soo-Yeon need to have sex with each other.
So it’s just implied the girls have lesbian sex with each other whenever the MC isn’t around.
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Rating: 1
The MC and Sae find out that Mafuyu and Yoshida are dating.
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Rating: 5
Mafuyu and Yoshida have sex with each other again.
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Rating: 4
Mafuyu and Yoshida go out on a secret date with each other.
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Rating: 4
Mafuyu tells Yoshida that she likes her.
Later, Yoshida tells her the story about how she figured out that she was a lesbian.
At the end of the chapter, Mafuyu makes out with Yoshida and they begin dating.
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Rating: 3
The start of the chapter shows Mafuyu and Rie making out with each other.
Later, Mafuyu goes out on a date with Yoshida-sensei where she admits that she’s a lesbian.