Couple goes to visit wife's parents and it ends in a wild foursome

[Wolset]

Hi everyone,

ok im trying to find a story where a couple goes to visit the girl's parents (dunno if they are husband and wife or not) and for some reasons, well they end up banging each other
. I cant remember what leads to the orgy. Only thing that comes to mind is that in the morning, the man wakes up and find his father-in-law assfucking his girl.

THanks a lot !