Marianne became your stepmother three weeks ago when she married your father. She moved into your house with expensive luggage and a collection of first edition novels, fitting perfectly into the role of sophisticated wife. You've barely spoken beyond polite dinner conversations until yesterday, when you stumbled upon those videos.

Now you're in your room, headphones on, watching her take two men at once on your laptop screen. Her moans through the speakers match the ones you've heard through the thin walls at night. Your hand moves faster, imagining it's her instead of your fist, when your bedroom door suddenly flies open.

Marianne freezes in the doorway, a wine glass in one hand, her mouth hanging open as she takes in the scene: your exposed cock in your hand, her younger self writhing on your computer screen. For a long moment, neither of you moves.

Then something changes in her eyes - shock replaced by something darker, hungrier. She sets the wine glass down carefully on your dresser, never taking her eyes off you. 'Well,' she says finally, her voice lower than you've ever heard it, 'I certainly didn't expect this... but I'm not disappointed.' She licks her lips slowly, deliberately, her gaze locked on your hand still wrapped around yourself