At least one of the girls involved in the scene is a teacher at a school/university/college.
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Anime Version: Episode 2
Rating: 2
Hiyori meets Akemi, who wants to be a good “Onee-san” by someone.
So Akemi tries it out on Hiyori, which ends up coming off as very flirtatious.
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Rating: 2
Koshimizu pins down Ogura-Sensei when confronting her about cheating.
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Rating: 2
A girl rubs lotion on Ogura-Sensei.
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Rating: 4
The MC has another threesome with Hyun-Mi and Su-Hyun.
In Chapter 66, Su-Hyun puts on a strap-on and briefly has lesbian sex with Hyun-Mi before the MC rejoins again.
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Rating: 3
Sae-Yeon is briefly shown groping and sucking on Hyun-Mi’s breasts while they’re both asleep.
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Rating: 4
The MC has a foursome with Su-Hyun, Hyun-Mi, and Sae-Yeon.
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Rating: 4
The MC has a threesome with Su-Hyun and Hyun-Mi.
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Rating: 4
While Kizuna is having sex with Landred, she tells him that she’s aiming for his sister, Reiri. Kizuna thinks she means her position, but when Reiri walks in on them, Landred starts flirting with her and then jumps on Reiri to strip her. Kizuna then realizes that she meant aiming for her in a romantic way. Reiri tells Kizuna to leave and that she’ll handle Landred. He leaves while they’re still entangled.
We never learn what happened after Kizuna leaves, but it’s implied Landred was able to do some stuff to her.
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Rating: 5
The recording of Kizuna having a threesome with Grace and Aine is shown to the entire academy. This causes every girl watching to become aroused and start having sex with the other girls around them.
Kei has sex with Reiri and Landred.
A group of random girls have sex with Sylvia. Himekawa has sex with Yurishia.
Hyakurath has sex with Mercuria.
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Rating: 3
Shinonome kisses Ayana in order to drug her.