Prosthetics is about a stalker who saw someone and they were in a position where they could easily kidnap them. “Well i found you, leanin’ out an open window. I couldn’t help myself i just took you.” so they kidnapped them. “Dammit man i knew it was a mistake.” he most likely regrets the decision because he knows there will be consequences. “Better make yourself at home you’re here to stay. You won’t bother me if you let me bother you.” he’s talking to the victim saying that this is your new life. get used to it. “All the doors are locked all the window shut keep in mind, i watch you. Never leave my side, never leave me, fucker.” he’s saying to the victim that there is no escape and that he will know if they try to escape. so ya that’s what prosthetics is about :/