eoforyth prompted me with Severus/Pince: well-thumbed and restricted.
A Library Find (NC-17; Pince/Snape; 100 words): There's a price to be paid for mistreating Pince's books.
"This is why one doesn't enter the Restricted Section without permission," Pince said, as she discovered Snape entangled in a well-thumbed page of Bascombe's Binding Enchantments.
Struggling against the vines which held him against the shelf, he begged, "Please, I can't—"
"Seventh Years," she said, drawing a finger along his bound, weeping prick, "you're all the same."
"I should leave you here." She smacked his prick.
"And let the book have you."
"N—no! Help me!"
"To free yourself, or to come?"
She grasped his prick by its base. "Very well, if you'll pay my penalty?"