Secret party

[Dominante]

It was about a couple who received an invitation to a secret party. They show up and it’s a swingers party with a live sex show in the middle of the room. They had never shared partners before but quickly became enthusiastic about trading partners.

 

[leofric35]

It was about a couple who received an invitation to a secret party. They show up and it’s a swingers party with a live sex show in the middle of the room. They had never shared partners before but quickly became enthusiastic about trading partners.

Not sure, but this one seems close to what you describe?
https://www.literotica.com/s/the-private-party