MM, if the ex-Pongo and his memsahib have any class whatsoever (which does NOT mean snobbery), they will make
anyone they've invited feel entirely welcome, so Mrs MM should not harbour any concerns and she can just relax.
It would be highly unlikely for an invitation to Mrs ex-Pongo's At Home to be restricted to just one couple; there'll probably be about a dozen others present, I would guess.
Mind you, I was once at a small military dinner when I noticed a colleague looking rather flushed and nervous. He later explained that the reason for his distress was that Mrs Bwigadier, whilst presenting an outwardly coy innocence, had been running her hand up his inner thigh (and beyond); it turns out that it was something she often used to do at such occasions in order to get the Bwigadier's sap to rise....
