How about Aiko getting strapped into a garroting chair? It's basically a chair with arm restraints, leg restraints, and a neck strap attached to a crank bar. When the crank bar is turned, the strap is tightened, and it can be tightened to the point where it crushes the occupant's throat and cuts off their airflow.

You don't need to start turning the crank bar right away - just strap her into the chair first. :)