The scene is caused by a third party, but there is consent from the girls involved. (Ex: A guy asking 2 girls to kiss.)
Series Page
Chapter Link (Pages 4-11)
Rating: 4
The MC has Ai and Ayano have lesbian sex with each other while he watches.
Afterwards, the MC has sex with Ai and Ayano leaves.
Series Page
Video Link (Rule34 Video)
Length: Medium
Stays Yuri: Male Involved + Male Watches
Rating: 3
After Saki finishes having sex with the MC, she goes to have lesbian sex with Megumu while the MC watches.
Series Page
Raw Chapter Link
Rating: 5
Mahiro is influenced by the room and becomes very aroused, causing her to seduce and attempt to have lesbian sex with Saki in front of the MC.
Eventually, the MC finally stops Mahiro by pulling her off Saki, ending the scene.
Series Page
Raw Chapter Link
Rating: 2
Schwertleite rubs against Irina and teases her breasts and body while they play twister.
Series Page
Rating: 4
The MC has a threesome with Jieun and Seoha.
Series Page
English Chapter Link
Raw Chapter Link (Fanbox)
Rating: 3
While Nene is trying to hypnotize the MC, she accidentally hypnotizes Lulu as well and ends up having a threesome with both of them.
Series Page
Video Link (Rule34 Video)
Length: Long
Stays Yuri: Male Joins
Rating: 4
During the harem route and after all both girls are hypnotized, Sakura seduces and has lesbian sex with Megumu.
Eventually the MC shows up and joins them for a threesome.
Series Page
Video Link (Rule34 Video)
Length: Medium
Stays Yuri: Male Involved
Rating: 3
At the end of Saki’s route, the MC has another threesome with Saki and Megumu.
Series Page
Video Link (Rule34 Video)
Length: Long
Stays Yuri: Male Joins + Male Watches
Rating: 3
During Saki’s route, the MC has a hypnotized Saki seduce and have lesbian sex with Megumu.
Eventually the MC enters the scene and joins them for a threesome.
Series Page
Video Link (Rule34 Video)
Length: Long
Stays Yuri: Male Joins + Male Watches
Rating: 4
During Megumu’s route, the MC has a hypnotized Megumu seduce and have lesbian sex with Sakura.
After the scene is over, the MC reveals himself and immediately has sex with Sakura. (I cut off the video once the MC joins because nothing yuri happens during it.)