"When there's a combination of people including at least one fairy and at least one party whose name is known to the other or who has, without already having vassalized the other, eaten food the other has a claim on, and the claim stuck which it may or may not do according to various factors, then there is a master and a vassal. Mutual vassalization is possible.

"Orders which are delivered by a master to their vassal and are possible to carry out, are; exact wording matters but so does the vassal's sincere interpretation of the sentence; most recent orders take precedence regardless of source and ordering someone to ignore an order does not work but going deaf does; orders may be enforced or not as a toggle, which can't be directly observed but I don't have to watch my mouth around the vampires lest I accidentally utter an imperative; forgetting a name ends a mastery based thereupon and it seems likely that an unused food claim can wear off but a used one is permanent.

"If you forget an order which does not require cognitive work of any kind to complete you obey it anyway but if you would need to know what it was to obey it you will be stuck in a loop trying to remember; orders may compel attention to or thought on subjects but cannot except by displacement forbid thoughts about other subjects nor affect emotions, memories, etcetera; and, smallest mercy, someone who is under more than the most trivial of orders cannot have their underlying personality learned well enough to supplement that gap with mental sorcery."