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Rating: 4
1 of the FMC’s is groped by another girl before the MC comes over and has sex with them.
Zetsumetsu Kigu Danshi – Chapter 15
Tag: Male Joins
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.)
Hatsujou Musume no Onedari Shin Seikatsu – Chapter 13
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Rating: 4
A guy records 2 girls having lesbian sex with each other, but eventually they invite him to join for a threesome.
Yokubou Pandora – Chapters 10-11
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Rating: 4
Rafalia gropes and teases Roselia’s body while having the MC both of their bodies to see whose is better.
Love Prelude – Chapters 53-54
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Rating: 3
Mia and Helen make out with each other for the MC. Eventually he joins in as well.
My Stepmother’s Friends – Chapters 111-118
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Rating: 5
The MC has a foursome with Na-Yeon, Gyeong-Eun, and Yu-Mi.
While the MC is having sex with Yu-Mi, he tells Na-Yeon and Gyeong-Eun to have lesbian sex with each other.
Eventually they join the MC, and Na-Yeon starts having lesbian sex with Yu-Mi when the MC switches to Gyeong-Eun.
There’s a few instances of the MC imagining them having lesbian sex, but they’re very brief, that’s why the tag is here.