Scene is from a pornhwa.
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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.
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Rating: 4
Yueling and Ruyun have lesbian sex with each other while the MC hides underneath their bed.
The MC then secretly joins in multiple times without Ruyun knowing until the end.
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Rating: 4
The MC forces Su-Yun to have lesbian sex with Sun-Ah before joining them for a threesome.
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Rating: 3
The MC has a threesome with Hyun-Mi and Su-Hyun.