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Rating: 3
The cover on the Korean version of Toptoon shows Na-Yeon and Yeon-Ah having sex with each other.
This scene seems to be depicted in the threesome from Ch. 97.
Keep It a Secret From Your Mother! – Cover Image
Tag: Full Nude
Scene features at least 1 girl fully nude.
Keep It a Secret From Your Mother! – Chapter 70
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Rating: 4
A continuation of the threesome with Na-Yeon and Yeon-Ah from Ch. 66.
Keep It a Secret From Your Mother! – Chapter 66
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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! – Chapters 50-55
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Rating: 5
The MC has a threesome with Soo-Yeon and Yeon-Ah.
Chapter 52 is the reveal about Soo-Yeon’s sex technique for Yeon-Ah.