A sub needs time to think. Time to reflect on the decisions made for him, for his own good. A “time-out.”
In my experience subs overthink every little thing, no matter how small or trivial. Wondering if they did the right thing, or if they should do anything. This is why taking that set of worries away from them is a great freedom. A great gift. They can then free up their minds to the task given to them. Whether that task is sucking a load out of his SIR’s cock, or cleaning a toilet.
This is why a time out in restraints reenforces that calm mental peace. An enforced time of reflection and peace.
Help out a sub…keep him focused…tie him up.