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: 3
The landlady FMC puts on a teacher outfit and teases one of the FMC’s in front of the MC.
Eventually they invite him to join as well for a threesome.
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Rating: 4
Himawari and Sakura make out in front of the MC again.
Eventually they have the MC join in as well.
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Rating: 3
The 2 girls from Ch. 15 kiss and show off a little in front of the professor.
It quickly ends and 1 of them leaves.
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Rating: 2
Rokuto meets Hikaru and immediately falls for her. She tries to have sex with her, but accidentally falls on top of the MC instead.
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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.
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Rating: 3
Misato and Risato have sex with Chisato in front of the MC, but eventually he joins in as well.
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Rating: 4
Mia and Sadoko have a threesome with Mikoto under the influence of Okon to help turn Mikoto back into a human.
Eventually, the MC joins in as well.
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Rating: 4
The MC watches 2 girls have lesbian sex with each other before joining them for a threesome.
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Rating: 4
The MC watches and masturbates to his mom and Ayaka-sensei having lesbian sex with each other, but eventually he actually joins in for a threesome.
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Rating: 3
The FMC makes out with a girl in bed before a guy joins them for a threesome.