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Rating: 4
Mizuho-sensei forces Kanare to join her and the MC for a threesome after she’s caught spying on them.
Chou Onee-san Tengoku – Vol. 1 Ch. 6
Tag: Flirting
Scene features a girl flirting with another girl.
Inkyo Joshi to Kaikan Propose – Chapter 5
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Rating: 5
Chinatsu’s teacher is revealed to be transferring away to Paris, so she asks Chinatsu if she can have sex with her before she leaves.
This prompts Chinatsu to ask Kei if it would be considered cheating if she did other things with another girl even though they’re dating, to which he says it would be.
Later, the teacher comes over to try and convince Kei to let her have sex with Chinatsu under the guise that it’d be a “test of their love.”
She then she tries to make Kei imagine Chinatsu making out and being “lovey-dovey” with another girl.
Chinatsu politely turns her down, but after hearing everything, Kei thinks it would be hot and agrees to let them have sex.
So Chinatsu and the teacher have lesbian sex with each other while Kei watches, but eventually he joins in as well for a threesome.
At the end of the chapter, after a time skip, the teacher sends them a letter, showing that she’s gotten together with a girl that looks very similar to Chinatsu.
Futari Kurashi – Chapters 105-106
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Rating: 5
Mai has sex with Yuuna and another girl while the MC is forced to watch.
At the end of Ch. 106, the MC breaks free and in Ch. 107, he joins in.
His Place – Chapters 129-132
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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.
Haru yo, Koi – Chapter 76
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Rating: 5
Mafuyu and Yoshida have sex with each other again.
Kanojo to Ane no Nijuurasen – Chapter 7
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Rating: 5
At the start of the chapter, Kaede comforts and kisses Yukino.
Later during an orgy, Risa briefly has sex with Miyabi-sensei.
At the end of the chapter, the girls jump Kaede and are about to have sex with her.
Lucky Guy – Chapters 52-53
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Rating: 5
Ms. Kang and Yujin stay at a motel together after staying out drinking. After Ms. Kang hears Yujin’s story, they start having sex.
When Ms. Kang wakes up, it briefly shows the sex scene again, implying they had sex all night long.
On the way to school, Ms Kang holds onto Yujin’s arm like they’re a couple.
This has the “Cheating” tag because Ms. Kang does this behind the MC’s back. He does find out at the end of Ch. 53, but he didn’t seem to mind.