Practically speaking, if you don't know how or are not willing to deal with a victim who is vomiting in a bad position and who may be aspirating vomit (and this often involves mouth-to-mouth suction, folks), don't do breath control play. Or locking gags, for that matter; medical accidents can and do happen. Bondage shears and basic first aid knowledge are your friend. In any position or scene, no matter how involved, you should be physically able to remove your submissive from bondage in a matter of seconds, by getting to the bondage shears (heavy duty scissors) and cutting them out if need be, in case an emergency arises.
