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Rating: 3
3 girls are hypnotized in the locker room to have sex with each other.
Eventually they spot the MC’s dick, who is hiding in a box, and use it.
Soku iki! ! Seikan Supurē ~ Muzumuzu Kokan Funsha ~ – Chapter 3
Tag: Grinding
Scene features a girl rubbing herself on another girl. (Not to be confused with tribadism.)
InCha na Ore ga Madougu o Tsukatte Share House de Harem o Tsukutte Mita. – Chapter 13
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Rating: 4
While the MC is having sex with Shieri, Rin and Ann briefly join in by groping Shieri.
While they’re sucking on her breasts, 1 of them mentions how they did this all the time in the past, implying they’ve had lesbian threesomes before.
Eventually Rin and Ann stop to just have lesbian sex with each other in the background.
So I’m gonna tag this as Male Involved, but the MC doesn’t do anything with Rin and Ann after they leave to have lesbian sex.
The Path to Salvation for a Zombie Girl Is Creampie – Chapter 8
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Rating: 3
The MC has a foursome with Mikoto, Sadako and Mia.
Chishojo Fuuki Iin no Minna ni Ienai Inbi na Onegai – Chapter 7
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Rating: 4
The MC has a foursome with Saki, Shiki and their mother.
At one point, Saki puts on a strap-on and has sex with her mother while Shiki and the MC watch.
Eventually they join in and the MC remains involved for the rest of the chapter.
Ring x Mama – Chapter 8
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Rating: 4
Asuka, Rio, and Linda all tease and play with each other before going to the MC.
Eventually the other girls come in and join as well.
What Do I Do Now? – Chapters 89-92
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Rating: 4
The MC has a foursome with Ae Ri, Si Hyun, and Soo Ah.
Nikuhisyo Yukiko – Chapter 99 Part 2
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Rating: 4
MC watches all 3 girls have sex with each other before joining in.
Nikuhisyo Yukiko – Chapter 80
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Rating: 4
Yukiko has a foursome with the MC and a married lesbian couple.
This World’s Breastfeeding Cafe – Chapters 29-30
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Rating: 4
The MC has a foursome with Plan, Chloe and Ruina.
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.