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Rating: 5
After Saki’s mom finishes having sex with the MC, she has sex with Saki as punishment for hiding her relationship from her. Saki gets very turned on from having sex with her own mother.
Eventually the MC rejoins them and it remains a threesome for the rest of the chapter.
Saki’s mother is married, but there’s no “Cheating” tag because she got permission from her husband to have sex with them.