In the dimly lit, sterile room, the sub lies on their back, legs spread wide, knees bent. The master, looming above, begins with a single finger, twisting and pushing, opening the sub's ass. The sub's body responds, muscles relaxing, allowing the master to slip in a second finger. The master's hand moves with precision, scissoring, stretching, preparing the sub for the main event. The sub's breathing grows ragged, their moans filling the room as the master's hand disappears, wrist-deep, into their ass. The master twists their hand, feeling the sub's insides, before beginning a slow, steady fist fuck.