The secret cumshot of the pigtailed student

A student sits at their desk, giggling as they hold a mirror up to their own reflection, their pigtails bouncing as they adjust their glasses. Across the room, their professor stands, unaware of the student's playful antics. The student, secretly, is masturbating under their desk, their giant cock pumping furiously as they imagine the professor’s face. With a final thrust, they erupt in a massive cum explosion, covering their clothes and the floor beneath them. The professor notices the mess but says nothing, perhaps not noticing the sticky evidence left behind.