Cleaning the cum out of my wife

First off, thanks for creating this community. Cross posting this from the fantasies community as it may be better suited here.

Something I always dream of when I’m aroused is cumming inside my wife, then being forced by her to lick up every drop that drips out.

I’ve told her this and she’s very game for it, but inevitably after I cum I have absolutely no interest in it anymore and find it kind of repulsive (and not in a sexy dom kinda way). Any suggestions on how to fulfill this fantasy?