Derek works at a porn store. One day, Stiles comes in asking all sorts of TMI questions about different toys. That's where it all starts.

Derek smirks at her, eyes hooded as he leans closer still, until his lips are brushing her ear. His breath fans hotly over the curve of her neck and Stiles shudders, knuckles going white as she clasps them together between her legs. “Touch yourself,” he whispers, the curve of his lips a shade too wicked.