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Rating: 5
Mars and Enma have lesbian sex with each other while the MC and his friend watch.
Eventually they also join in for a foursome.
Tail Chaser – Chapter 11
Tag: Full Nude
Scene features at least 1 girl fully nude.
Fate/Grand Order dj – Skill Kyouka Kaikin – Chapter 1
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Rating: 5
Ishtar briefly has lesbian sex with Eresh before inviting the MC to join them for a threesome.
Shiro Gal Kanojo ga Dekita Riyuu – Chapter 3
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Rating: 4
The MC has a threesome with Rika and Momoka.
Bakunyuu Shimai ni Natsukareru – Chapter 1
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Rating: 4
The MC has a threesome with 2 sisters named Mai and Yua.
Rankon – Chapter 9
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Rating: 5
The MC has an orgy with every girl that’s appeared in the series.
At 1 point, Yuzu and Rio go have lesbian sex with each other.
At the same time, the 2 coworkers from Ch. 5 have lesbian sex with Ayumu.
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.
Son of Nam – Chapters 34-38
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Rating: 4
The MC has a threesome with Geumbo and Eunbo.
My Wife Started Experimenting – Chapter 3
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Rating: 4
After getting to their room, the MC has a threesome with Mei and Ai.
Later, the MC has a foursome with Mei, Ai, and Yuna.
Hyeonjung’s Residence – Chapters 45-47
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Rating: 4
The MC has a threesome with Jane and Jenny.
Succubus in Love’s Erotic Situation – Chapter 26
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Rating: 5
At the start of the chapter, Hooru has Fera make her invisible with a spell. Since it doesn’t make her clothes invisible, she strips nude to remain hidden.
Hooru then uses her invisibility to tease and play with Ouna.
Later, Torisu shows up and Hooru has a flashback of her having sex with her, so she stays quiet as to not be found by her.
But because of her keen senses and obsession with Hooru, Torisu finds her regardless and has sex with her.