If the scene starts as fully yuri, but eventually a male comes in and joins them. (The “Male Involved” tag is only used if the male is involved from the beginning of the scene.)
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Rating: 4
At the start of Ch. 20, it’s revealed that the mother had started sexually training the teacher off-screen by having lesbian sex with her.
The scene then progresses into the MC having a threesome with both of them.
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Rating: 3
Kim Naru tries to have sex with Baek-Young right next to the MC while he’s asleep.
But eventually she stops her and focuses only on the MC.
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Rating: 4
While celebrating their victory, after Heather finishes kissing Ryan, she goes to make out with Alley Cat.
Later, after they get back home, they have a threesome together.
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Rating: 4
Kikka briefly has lesbian sex with Tsubaki while the MC hides and watches.
Eventually the MC comes out and has sex with Tsubaki, ending the yuri part.
This chapter has an English translation, but it’s officially licensed, so you’ll have to do a bit of searching if you want to find it.
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Rating: 2
Ji-Yun and Chae-Rin grope and lubricate Hye-Na’s breasts to try and impress the MC.
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Rating: 4
The MC has a threesome with 2 of the FMC’s.
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Rating: 2
The MC comes home to have another threesome with Su-Jin and Seo-Woo.
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Rating: 1
While the group is playing the king game, Mone and Tsubaki briefly press their breasts together in front of the MC.
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Rating: 2
Tsubaki and Asahina get stuck and end up rubbing against each other while the MC tries to help them get out.
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Rating: 3
Tsubaki gets hypnotized and tries to comfort Mone in the same way she did for her in Ch. 21.
They both then go over to the MC and press their breasts together, but Tsubaki snaps out of her hypnosis and the scene ends.