In the quiet confines of the library, a man, known only as 'Library Man 4,' indulges in his private pastime. With a discreet glance around, he unzips, revealing his throbbing dick. He strokes it slowly, feeling the pulse of his desire, as the scent of old books and new lust fills the air. His hand moves rhythmically, his breath hitches, and his eyes flicker to the nearby patrons, adding a thrill of the forbidden to his public stroke.