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.)
Series Page
Chapter Link (Pages 171-189)
Rating: 4
When Aya visits Mai and the MC for the first time in a while, she attempts to seduce Mai and have lesbian sex with her.
But just as they begin to make out, the MC walks in and turns the scene into a threesome.
Series Page
Chapter Link (Pages 45-64)
Rating: 4
Aya helps out Mai have sex with the MC and they have a threesome together.
After Aya kisses Mai, she admits that she liked kissing Aya more.
Series Page
Chapter Link
Anime Version: Episode 10 Scene 1
Rating: 3
Papi is forced to suck on Kii’s breasts in order to stop her, but Kii ties Papi up.
So then the MC has to come and do it instead.
Series Page
Rating: 5
Seo-Yeon takes the MC to Eun-Ju’s place to have another threesome.
Seo-Yeon starts by kissing and pinning down Eun-Ju, which then prompts her to tease the MC, saying if he doesn’t join, she’ll just have lesbian sex with her.
Later during a montage of the night, they’re briefly seen having lesbian sex again without the MC.
Series Page
Rating: 5
Eun-Ju convinces Seo-Yeon to join in on having sex with the MC.
At one point, the MC is blindfolded and when he takes it off, he sees both of them making out with each other.
Throughout the threesome, Seo-Yeon realizes she’s bisexual and that she likes having sex with women as well.
Series Page
Raw Chapter Link (Pages 366-375)
Rating: 4
Ruri spies on Kaname (Ruri’s Aunt) and the MC having sex.
Kaname sees her and starts seducing her by groping and making out with her.
The MC eventually joins in and it turns into a threesome.
Series Page
Raw Chapter Link (Pages 155-173)
Rating: 3
Rion invites her sister, Shion, to have a threesome with herself and the MC.
Series Page
Rating: 5
The MC convinces the both of the FMCs to have lesbian sex with each other as a way for them to get along.
In Ch. 23, the MC joins in and the scene becomes a threesome.
(The black haired FMC is divorced at this point, and while the other woman is still married, she is in the process of getting a divorce, so there’s no Married or Cheating tags here.)
Series Page
Chapter Link (Pages 328-330 & 332-351)
Rating: 3
Hina is groped and kissed by Mei and Utsuki, but they get interrupted before they can go any further.
The chapter then proceeds into an orgy with the whole student council.
Series Page
Chapter Link (Pages 252-262)
Rating: 5
Jun and Utsuki catch Hina and Mei having lesbian sex with each other.
Afterwards, all four of them proceed to have a FFFM Foursome together.
