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
Kaori goes to seduce Miki and briefly has lesbian sex with her.
Eventually the MC walks in and joins for a threesome.
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Rating: 4
Shelly and Janet have lesbian sex with each other while the MC watches them.
Eventually he joins in for a threesome.
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Rating: 3
Mi-Jin seduces Yoon-Jung and has lesbian sex with her.
This continues into the next chapter, where the MC joins and it becomes a threesome.
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Rating: 1
Nana gets flustered when she holds hands with Yagami at a festival, but then Yagami’s brother takes Nana’s other hand.
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Rating: 2
Inukai rubs her body and gropes Eri when she meets her for the first time.
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Rating: 5
2 of the tenants have lesbian sex with each other in front of the MC before they allow him to join in for a threesome.
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Rating: 3
Toshima and Melissa briefly make out before the MC joins them for a threesome.
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Rating: 3
Sophia gropes and presses her breasts against Haruka while they do an erotic cosplay photo shoot for the MC.
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Rating: 3
Da-Jung gives Su-Jin’s an erotic oil massage in front of the MC while they’re live streaming.
After she finishes, she asks Su-Jin to do the same for her, but she backs out and the MC does it instead.
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Rating: 5
At the start of the series, the MC’s fiancé, Kanae, supposedly runs away after finding out the the MC wrote erotica.
The MC has a dream about Hitomi NTR’ing him and tells him that she has been having lesbian sex with Kanae off-screen throughout the whole series.
After he wakes up, he goes to confront Hitomi, which eventually leads to the reveal that Kanae was actually there and it’s strongly implied that his dream was true.
At the end of the chapter, there is another reveal with this is purgatory and that the MC is in a coma, so regardless, the entire story is an Imagination.