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Rating: 4
During a foursome with 2 other guys, the FMC has lesbian sex with another girl.
Oshare Maruhi Sensei – Chapter 7
Tag: Male Involved
Scene has a male involved in some way from the beginning. (Whether it’s for a FFM Threesome or some other means.)
Haha no Shinyuu Boku no Aijin – Chapter 3
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Chapter Link
Rating: 3
The MC has a threesome with Aki and Sonoko.
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.
Rankon – Chapter 5
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Chapter Link
Rating: 4
The MC has a foursome with Yuzu and 2 of her coworkers.
King of the Night – Chapters 113-114
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Chapter Link
Rating: 4
The MC has a threesome with Sun-Kyung and Ha-Yeon.
Sun-Kyung briefly gets the MC away and just has lesbian sex with Ha-Yeon, but he quickly joins back in.