exhibitionist-by-proxy

A Kink

When a husband, wife, girlfriend, boyfriend, or any romantic partner gets off exposing their partner, or any one private part of their body naked to friends.

example, pulling the strings on your wifes bikini while she is asleep on the beach, then startle her when someone goes by.

Alternative Kink included would be Flashing by Proxy

My husband is a exhibitionist-by-proxy, he gets off showing me topless or flashing me totally naked to his friends and sometimes a stranger.