Looking for a very old xossip story

[undbeirlustishere]

It was a story where a guys mum is fucked hard by a cab driver, she's reluctant at first but then she's seen enjoying. The boys father travel first by train or something and this lady and her kid have to go by a overnight cab. A small detail that I remember was while fucking her bra or part of her clothing falls on the boy or around him as he's watching all of that. Hot story. Never could find it.