Looking for Wife Anal Gangbang Anniversary Story

[Millstevie]

Looking for a story that’s probably at least 20 years old. Background is man invites a girl to a party on first date, finds here getting an anal train run on her. She apologizes and says she really likes anal sex. He keeps dating her and agrees anal is open for her. After years of marriage where anal doesn’t count as cheating, he sets her up with a gangbang for their anniversary to earn her present. She proceeds to have an organized (to the point of nurses checking for stds on site) anal train run on her by a room full of guys set up at their local high end club.

Any ideas?