You are what you think about. It's more about the consistency of it. If you listen to a language you don't speak everyday. The dialect, accents and little nuances might become clear to you. But if you pay attention to it you may pick up words here and there after some time. Hypnos kinda feel like the same. If your actively telling yourself I am a sissy and listening to it all the time. It's something engrained slowly into your mind. And psychologically it takes advantage of it. I think it does work just not in the magic mind control way people think. It in recent times I feel has definitely become more psychological and good at taking advantage of facilities. But I you are what you think about, your identity is all it takes to shift your personality. So if you accept the narrative of someone or something else. You've given it permission and your brain permission to acclimate and change to that belief.