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Chapter Link
Rating: 4
Mayu has another threesome with Midori and Mistunobu.
Show Ten Kanojo – Chapter 7
Tag: Yuri Fantasies/Thoughts
The scene has a girl talking about her sexuality or thoughts on being with a girl.
Sex Study Group – Chapters 106-107
Series Page
Chapter Link
Rating: 4
The MC has a threesome with Eun-Jung and Dae-Un.
During Ch. 107, Eun-Jung and Dae-Un briefly have lesbian sex, but the MC quickly rejoins.
Joshi OtaCir no Ouji-sama – Chapter 7
Series Page
Raw Chapter Link (Page 179)
Rating: 4
The MC has an orgy with all 4 of the girls in the club and their advisor/teacher.
At one point, a few of the girls briefly break off to have lesbian sex with each other, but they quickly invite the MC back in.
This chapter has an official translation that you’ll have to look around to find.