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
Misaki catches Rin spying on her having sex with the MC, so Misaki goes to make out with her and seduce her.
Misaki then fingers and teases her as well before having her join them for a threesome.
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Rating: 4
The 2 FMC’s briefly make out with each other in front of the MC before joining him for a threesome.
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Rating: 3
The 1st page of this chapter briefly shows a lesbian couple having sex with each other.
The rest of the chapter is about a guy raping both of them, so I’ll tag this as Male Joins.
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Rating: 4
The 2 FMC’s briefly start to have lesbian sex with each other in front of the MC before he quickly joins them for a threesome.
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Rating: 3
3 girls are hypnotized in the locker room to have sex with each other.
Eventually they spot the MC’s dick, who is hiding in a box, and use it.
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Rating: 3
At the start of the chapter, Misao starts seducing and fingering Midori. She then invites her to have a threesome with the MC.
At the end of the chapter, she tells Midori that she’ll keep teaching her stuff if she backs off from the MC, implying they’ll have sex again without the MC.
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Rating: 4
2 of the FMC’s have lesbian sex in front of the MC before inviting him to join for a threesome.
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Rating: 4
The FMC is forced to have sex with her friend and another guy.
At the end, they threaten to use a taser on the guy to make him go away.
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Rating: 3
2 of the FMC’s have lesbian sex with each other in front of the MC before he joins them for a threesome.
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Rating: 3
The FMC pins down and gropes another girl in the sauna, but the MC quickly joins in for a threesome.