You were a supernatural creature. Dean and Sam knew that much. They just didn't know what, and plainly didn't care. You just watched them silently. They felt your presence, but after a while they got used to it. They weren't as wary as at the start anymore, now a lot more relaxed when you were around. The boys never knew what you wanted, but you didn't harm them, so they didn't bother asking. They let you be, just like you let them be...

Well, until now. Sam was out to buy groceries and stock up the salts and everything. Dean was in the main area of the bunker when suddenly he heard noises. He found you in a room, accidentally knocking over a glass. When it hit the ground you immediately panicked and when you saw him, you squeaked and disappeared. Dean just stood there, processing everything. That was the first time you interacted with the things around you, from their observations.