She'd got caught.
Again.

The first time they caught her masturbating in private she had to wear the silver ring to remind everyone she was a disobedient slut who was ashamed of edging in public as expected, and might even be cumming without permission.
The second time got her the piercings and the chain. They were never allowed to be covered, and gave anyone the right to pull her down and get some oral relief.
But the third time? She was free use in the slut stocks for 24 hours. 
But that wasn't the worst of it. No, the fact her holes were about to not just get fucked, but groped, abused, stretched... she knew that would happen. She couldn't do anything about it. Which was part of the appeal.
No, the worst thing was the one element she could control. If anyone made her orgasm they earned 30 days breeding rights. Rights they could use, or sell to the highest bidder. A month, chained to a bed, being filled with cum multiple times a day in an effort to put a baby in her. 
Of course there was an upside. Only pregnant women were allowed to orgasm. As much as they wanted. Every one of her friends was with child. And cumming their fucking brains out. They'd convinced her it was her turn. 
She just prayed it was one of the cute, single guys who'd make her cum. She just had to hold out, as unfortunately she'd get used in order of seniority. She'd need to last nearly the whole day if she didn't want to be a breeding mare to some old pervert. Like all of her friends had.