All that training you've been doing with plugs and dildos between me railing you has lead up to this. I told you long ago what I had in mind for future fuckery. Do you remember when you were a budding little slut who could barely fit two fingers? I remember it too. Congrats! I've stretched you out enough to be fucked by a machine. Here's a demonstration on how deeply it can penetrate you before I restrain you to the chair. It can go extremely fast, so, immobilization is necessary.