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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: Incest
Scene features 2 or more girls that are related by blood.
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.