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Rating: 5
MC has Na-Yeon and Yeon-Ah (Mother and Daughter) make out with each other. They kiss while the MC watches, then they eventually go to have sex with him.
Keep It a Secret From Your Mother! – Chapter 66
Tag: Male Joins
If the scene starts as fully yuri, but eventually a male comes in and joins them. (The “Male Involved” tag is only used if the male is involved from the beginning of the scene.)