Mia is sealed inside a bondage sack, arms and legs pinned, with only her face and the access point for the toy left free. A thunderstick is locked against her and wired to a timer switch that cycles it on and off without her control. At first she bites back every sound, jaw tight, trying to ride the pulses without giving anything away. The intervals keep landing right at the edge, and the restraint means she can’t shift away or finish the motion herself. The whimpers start leaking through as the timer drives her into a tight spiral of need she can’t close.