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
Rating: 4
The MC’s ex girlfriend, Jessie, seduces and has lesbian sex with Shion while forcing the MC to watch.
Eventually she allows the MC to join them for a threesome.
Series Page
Chapter Link (Pages 1130-1145)
Rating: 4
Alfie has lesbian sex with Rug at a party.
Eventually they’re joined by the couple having sex next to them for a foursome.
Series Page
Chapter Link (Pages 605-654)
Rating: 3
Multiple Voch’Khari seduce and have an orgy with Lydia and Marco.
Lydia has lesbian sex for a while, but eventually joins in with Marco.
Content Warning
There is also gay sex with Marco in this scene, just as a forewarning for anyone not wanting to see that kind of thing.
Series Page
Chapter Link (Pages 509-546)
Rating: 5
Continued from the Previous Scene, Lydia seduces and has lesbian sex with Alfie in front of Marco.
Eventually Marco joins them for a threesome.
Series Page
Chapter Link (Pages 506-508)
Rating: 2
Lydia briefly tells Alfie the story of how she and Marco had sex with Mrs. Kelly.
Series Page
Episode Link
Timestamp: 22:50-27:45
Rating: 4
Nozomi, Kaoru and Mei briefly have lesbian sex with Ayano in front of the MC before he eventually joins them for an orgy.
Series Page
Rating: 3
Nana and Bronze have lesbian sex with each other while a guy has sex with Marie.
Series Page
Chapter Link
Rating: 4
Ashtar seduces and has lesbian sex with Chris in front of the MC to show her how to properly be a sex slave.
Eventually the MC joins in and Ashtar backs off while watching instead.
I gave this the Netorare tag because the MC was feeling jealous and aroused before joining, but I’m not sure it’s really deserving of it?
Series Page
Video Link (Rule34 Video)
Length: Long
Stays Yuri: Male Watches + Male Joins
Rating: 3
In one of the endings of the game, Asuna, Masami and Chihiro briefly having lesbian sex with each other before the MC joins them for a foursome.
Series Page
Video Link (Rule34 Video)
Length: Long
Stays Yuri: No Male (Male Watches) + Male Joins (Multiple Scenes)
Rating: 4
The MC spies on Asuna seducing and having lesbian sex with Chihiro while they’re outside. (He does not reveal himself during this part, he only secretly watches from afar.)
Later in the day, he goes to spy in on Asuna’s room and catches her having lesbian sex with Chihiro again, but this time they invite him to join them for a threesome.
There’s sadly no CG for the first lesbian sex scene, it’s purely text combined with Asuna and Chihiro’s character sprites while the MC spies on the scene.
This has the No Male tag for the first part of the scene and the Male Joins tag for the second part.