I think I had found it on Literotica a few months back, but can’t find it anywhere now.
It was about a girl living in a sex cult that has a coming of age initiation where the girls are auctioned to a man for their first time, which is performed on a stage in front of all the men.
This girl was bought by 3 men who all had their way with her on stage together, she is then taken to a hit where she has to stay for a week (?) And eats nothing but cum from the men that visit her in that time.
I really liked this one, but didn’t think to save it. If anyone knows the name or has a link I will be eternally grateful!