The scene is caused by a third party, but there is not consent from the girls involved. (Ex: A guy forces a girl to have sex with another girl.)
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Timestamps: 06:00-8:08 (Male Watches) / 08:09-09:02 (Male Joins)
Rating: 3
Hiromi and Shoko are bound together and forced to have lesbian sex while the others watch.
Afterwards, the antagonist joins in for a threesome.
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Rating: 1
Ji-Na briefly forces Da-Hyeon and Yu-Bin together before tossing them towards the MC.
This continues into the Next Chapter, where the MC has an FFFM Foursome with all of them.
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Timestamp: 09:10-10:17
Rating: 1
A group of men have an orgy with Yukiko and Shiraki.
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Rating: 2
Ivory and Lola are briefly forced to have lesbian sex with each other by a man. (Only 2 Pages)
The man then briefly joins and rapes Ivory, but she quickly knocks him out so she can escape.
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Episode Link
Timestamp: 14:04-17:56
Rating: 4
Mikuru rapes/has lesbian sex with Natsuki.
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Timestamp: 09:26-14:00
Rating: 4
Haruka is raped by Eri in front of the MC while he’s tied-up.
Eventually the MC breaks free and joins them for a threesome.
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Raw Chapter Link
Rating: 3
Mahiro and Tsubakiyama-sensei are briefly forced to have lesbian sex with each other by a possessed Yuki, but eventually one of the MCs watching joins in as well.
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Rating: 4
Continued from the Previous Scene, Yura continues her sexual training/punishment on Seol-Hee.
In Chapter 55, Yura stop and goes to have sex with the MC, so this is tagged as Male Joins.
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H-Anime Version: OVA Scene 2
Rating: 3
Airi throws a chemical at Touko and Ayana that causes them tied up and forced together.
Airi then lets loose her hand machine, which proceeds to grope both of their bodies.
They both get aroused by the situation, so Touko takes the opportunity to kiss and tease Ayana during it.
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Manga Version: Chapters 16-18 + Anime Original
Timestamps: 12:24-13:26 / 14:07-16:13 / 18:16-20:55
Rating: 5
Hitomi and Eruza get put under a aphrodisiac and they start making out and grinding against each other.
(This scene is a lot longer and more erotic compared to the Manga Version.)