Nine days earlier, Taylor Stern had screeched accusations of impropriety at me so loudly I'd had to stall my entire class in order to address her insistence that she was not the cheater that we all knew she was. But the sounds that tripped from her lips now were so quiet they wouldn't have been audible over the shlick shlick of Candy's vigorous pumping of Abbie's snatch, much less the delirious moans that accompanied it.

"Come again, Taylor?"

Her whole body was trembling. "I said, 'it's not from them.'"

I affected confusion. "Oh? What then?" Abbie managed to split her attention enough to sport a wolfish grin at her sister's...