Dr. Dave had sex with one of his patients and felt guilty all day long.
No matter how much he tried to forget about it he just couldn't.
The guilt was overwhelming.
But every once in a while he would hear in internal, reassuring voice in his head that said: "Dave don't worry about it. You aren't the first medical practitioner to have sex with one of his patients and you won't be the last. Just let It go Dave."
But invariably another voice in his head would bring him back to reality whispering: "Dave... Daaaave... you're a veterinarian you sick bastard!"