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Rating: 4
The MC has a threesome with Kano-sensei and his own mother.
Fellatio Kenkyuubu – Chapter 4
Tag: Long Scene
Scene is very long in length. (Most of the chapter or multiple chapters.)
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.