Consent vs Abuse Polling Questions

When it comes to consent in M/s-D/s relationships, who consents and who has the right to withdraw consent?

In the context of a M/s-D/s dynamic, once consent has been given when, if ever, is it acceptable for such consent to be withdrawn?

Can consent be withdrawn without damaging the D/s dynamic?

Is it ethical to impose negative consequences for withdrawing consent vis-à-vis the M/s-D/s dynamic?