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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.
Erotic Manga Café Girls – Chapter 56
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Rating: 3
The MC has a foursome with So-Hee, So-Yun and Han-Na.
Mother-in-Law Bends To My Will – Chapters 19-20
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Rating: 3
At the end of the chapter, the MC takes Sooyeon to serve a new woman, who is later revealed to be her sister, Soohee.
Eventually the MC joins in as well for a threesome.