A father-in-law who suffers from impotence gets a full erection for the first time in six years when he sees his wife's body. "This might be the last time I get an erection, so let me put it in just this once..." His pussy, which he reluctantly allows to be connected to her, can't forget the taste of his incestuous cock, and he spends his days having raw sex with her behind her husband's back. Serina Usui