A nondescript square building that has room for two guards that change shift every 8 hours.  There's a fireplace inside, food enough for a week and a large earthenware jug of water for cooking and drinking.
Guard Shack, Outside Tower
guard
bivalve
I am a bivalve that lives in water.  I have a shell that protects me.  I sometimes can carry a pearl inside my shell. My shape is oval and irregular.
I am indeed. You are much more welcoming than the last guard. I asked for water in that jug, and he attacked me... How dare he hurt my bivalve! I shall have a word with him when he comes back from his shift.  Oh good! He was mean and mocked me for being here with little water.  I hope this eases your pain. I shall get you enough water to last a week!  Yes, thank you! This is why you are my favorite.  Now where was I.. Oh yes, you sure smell nice, so refreshingly alive.. I am indeed. They say when a human smells that then that is how they know there is a pearl inside.  Indeed, you are a smart creature. i hope you can forgive me if I were to.. gently remove the pearl.  I take pride in my pearl. It is a part of me here... Of course, forget I mentioned it. Now I hope you are not angry with me for keeping you in captivity.  It is safer for me in here than out there I suppose. yes it must be. With so many mean folks who would hurt you with weapons such as this. 