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This title belongs to a specific sub-genre of adult manga often referred to as or "Cuckoldry," focusing on the themes of betrayal and illicit family dynamics. The story typically follows a standard narrative arc where a protagonist discovers—or is forced to witness—an ongoing affair between his wife and his own father. Thematic Elements
Tsuma no Biniku o Ijiru Chichi no Futoi Yubi -S...
The Father's Thick Fingers Fiddling with the Wife's Delicate Flesh