The student, her face flushed with a mix of embarrassment and excitement, watches as her professor lubes up the strap-on, the cool liquid glistening on the black leather. He turns her around, bending her over his desk, and she can feel his breath on her neck as he whispers instructions. She spreads her legs, her heart pounding in her chest as she feels the head of the strap-on press against her tight, virgin asshole. He pushes in slowly, allowing her to adjust to the sensation, but she's eager, pushing back against him, wanting to feel every inch of the thick phallus inside her. He starts to move, his hips thrusting in a steady rhythm, his hands gripping her hips tightly as he fucks her hard, the sound of their bodies slapping together filling the room.