In the quiet stacks of “how to jerk off in shower,” a prim librarian type hikes up her pencil skirt under the table. No one sees her fingers dive beneath silk panties. “how to jerk off in shower” hides the camera low, catching every furtive circle on her clit. Her breathing grows ragged; she bites her lip to stay silent as she comes, thighs clamping around her hand while pretending to read.