Find the Headmistress in a similar position

With the memory of the teenaged blonde still burning in your mind's eye you return to the foyer adjusting the bulge that has grown in your pants. It would hardly do to meet the headmistress with a full blown boner, and not much better if you tried to explain you got it watching one of her students masturbating on a teacher's desk.

The third heavy wooden door on the left is clearly marked "Headmistress." You knock, but hearing no answer open the door slowly to find an outer office with an empty desk. The room is too small to be the Headmistress' office you decide, more likely a secretary or receptionist's. A door slightly ajar leads to an inner office and you move silently across the thick Persian rug until you can just peek into the Headmistress' sanctum.

I woman in her forties with her hair pulled back in a tight bun is sitting at an antique Edwardian desk that somehow manages to appear feminine and delicate in spite of its massive size. She is engrossed in a book, and just before you announce yourself, your brain takes in a few more critical details that make you glad you kept your mouth shut.

The paperback book in the Headmistress' pale fingers is a historical romance much like your mother reads; on the cover a bare-chested man in a kilt is leaning over a much smaller blonde woman in a gown that is almost but not quite pulled off her swollen white breast. The Highlander's Passiona- something, the rest of the title is hidden from view, but it hardly matters, the second and even more critical piece of information you note is that while her eyes are fixed on the pages of the paperback, her free hand is cupping the breast under the partially unbuttoned wool blazer. As you watch in stunned surprise you see that her fingers are teasing the clearly visible nub through the shimmering white silk of her blouse.

Once again your cock is rock hard. First the student and now the Headmistress herself, Senator Williams wasn't kidding when he told you this school is out of control.