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
Raw Chapter Link (Pages 109-126)
Rating: 3
Two of the FMCs very briefly have lesbian sex before the MC quickly joins them for a threesome.
Series Page
Episode Link
Timestamps: 06:34-09:26 (Male Watches) / 09:27-11:37 (Male Joins/FFM Threesome)
Rating: 5
Kaori and Rui punish a male student by forcing him to watch them have lesbian sex with each other.
Eventually they allow him to join them for a threesome.
Series Page
Episode Link
Timestamp: 14:39-16:06
Rating: 2
Marimo catches Miki masturbating and has lesbian sex with her.
Afterwards, the MC joins in as well, so this is technically a Male Joins scene, but it isn’t a threesome.
Series Page
Chapter Link
Rating: 3
Ryouka briefly has lesbian sex with Yuzuki in front of the MC, but eventually he joins them for a threesome.
Series Page
Rating: 1
At the end of the chapter, Ahreum and Mihye’s breasts briefly press together.
This continues into an FFM Threesome in the Next Chapter.
Series Page
Raw Chapter Link
Rating: 2
Yukino is forced into an orgy with multiple other men and women.
Series Page
Rating: 5
In the final chapter, the MC has a foursome with Stacy, Gina and Gia.
Per the MC’s request, the girls have lesbian sex with each other during it.
Series Page
Rating: 3
The MC has Daeun have lesbian sex with Chaejung.
In Ch. 58, the MC joins them for an FFM Threesome.
Series Page
Video Link (Rule34 Video)
Length: Long
Stays Yuri: Male Watches + Male Joins
Rating: 4
Asuhi seduces and has lesbian sex with Hinare while the MC watches.
Afterwards, they invited the MC to join them for a threesome.
This is the entirety of the Harem Route.
Series Page
Video Link (Rule34 Video)
Length: Long
Stays Yuri: Male Watches + Male Joins
Rating: 3
The MC has another threesome with Asuhi and Hinare.
This takes place during Hinare’s route.