Thoughts about Mickey and Invitations:
-He only needs an invitation to enter private dwellings owned and occupied by the living. He can freely enter the homes of other undead, public and government buildings, or businesses that are normally open for the public to wander in and out, even during non-business hours when they're closed and the doors are locked.
-Once Mickey receives an invitation, he can exit and enter freely. The invitation cannot be rescinded verbally once given; a magical ritual or holy rite to cleanse the dwelling is needed to revoke it.
-The invitation has to come from a living person on the premises that is capable of understanding language - other undead cannot invite Mickey inside a mortal human's dwelling.
-The invitation does not have to be phrased any particular way as long as it is clear. It can be communicated verbally, in writing, or with sign language or gestures. It does not have to be intended as an invitation, if it can be understood as one. Gesturing at a door may or may not count depending on context; pointing or nodding and saying "look at that red door" would not be an invitation, but looking at Mickey and then silently pointing or nodding in a way that clearly signals 'Mickey, go through that door' would count.
-A permanent dweller can extend the invitation to enter their home at any time or anywhere. Any other mortal can also extend the invitation but only if they are on the premises at the time.
-If the building is an apartment building, inviting Mickey inside one apartment gives him the ability to enter any room in the building EXCEPT any apartments which have been individually hallowed with magic or holy rites to give it a separate spiritual space from the rest of the building.
-Physically carrying Mickey inside the building under your own power while he is helpless/unconscious doesn't count. While carrying someone inside could be understood pretty explicitly as an invitation, that wasn't Mickey - it was a corpse. The corpse will not be affected while it rests inside the building, but once the vampire that is Mickey has reawakened, he has to leave and needs an official invitation to return.
-A Welcome mat or Open sign counts as an invitation.
Being inside a building without an invitation is physically painful, thinking is hard, and biting a human is extremely difficult and more damaging than beneficial. Under most circumstances though, Mickey physically cannot pass the threshold at all until he's invited, it's like there's a wall there even if the door is open. It takes an immense force of will or him being pushed through to get him inside.
