I have a different approach to to the "seduced by daughter's boyfriend". Here it goes:
A guy cheats on his girlfriend with her mom and brags about to everyone. The girlfriend, angry and ashamed, casts a curse on his mother that made her a nymphomaniac.
The boyfriend’s mother began having sex shamelessly with everyone, even quitting her respectable job to become a pornstar and a prostitute to feed her insatiable lust.
[Optional] the story is told by the boyfriend, who hears about (or sees) his mother’s wild sexcapades.
A guy cheats on his girlfriend with her mom and brags about to everyone. The girlfriend, angry and ashamed, casts a curse on his mother that made her a nymphomaniac.
The boyfriend’s mother began having sex shamelessly with everyone, even quitting her respectable job to become a pornstar and a prostitute to feed her insatiable lust.
[Optional] the story is told by the boyfriend, who hears about (or sees) his mother’s wild sexcapades.