She turns them down with a lie.

"Um, thanks," Amy said, "but I don't really want the thong, it's, uh...not very sanitary."

"Ha!" the older girl barked, "you here that maggot? She's the one running around campus with her pussy hanging out and your skank-ass is still too dirty for her!"

Janice blushed deeply, but her sorority sister continued. "Since we can't have you getting out of your punishment. I think you'd better clean your thong for your guest....with your mouth."

"No, wait!" Amy said, "I changed my mind, I'll wear, them. Really it's no big deal."

"Too late. Janice, suck that thong clean."

Obediently, the petite blonde girl started and licking and sucking her own thong while Amy and her pledge sister looked on. Amy felt a strange mixture of pity and arousal as the girl debased herself by sucking her own pussy and ass sent off her dirty underwear.

Eventually, the older sister said it was enough and Amy was handed the thong again, this time damp with Janice's saliva.

"Go ahead, put it on." The girl said.

Amy thought about refusing just to show this bitch that while she might have power over Janice, she wasn't the boss of Amy.

But, on the other hand, that would mean Janice had gone through that humiliation for nothing!