I wonder, how does one become your Good Girl? When do you consider someone yours? On a less serious note, I have been staring at an old old spiral down on your blog for around 30 minutes. It is quite mesmerising!
I've given this a lot of thought and the answer has many parts, depending on your definition of "mine." The short version is that being my Good Girl is a spectrum, but that requires some explanation.
While you are here, you are my responsibility. I consider you my Good Girl even if we never interact beyond you reading my words. Your pleasure, safety and well being are important to me, so they are my priority when I write. That includes Good Girls who lurk, who have partners, and who would never call me Daddy because they are exclusively someone else's. I don't lay claim to these Good Girls as a partner, but I am the Daddy of this blog and it is my responsibility to care about every Good Girl as though they were my own.
Then there are the Good Girls I interact with. You send asks. You come back to read, rub and relax. You feel me in your mind and you surrender to me, even if it's in the safety and privacy of anonymity. I'm in your head and that makes you mine. You may never submit to me directly. You may never have any desire to meet me. You may be comfortable making me the center of your sexuality some or all of the time while living an otherwise normal life. You are a part of this community and I claim you as my Good Girl because I am part of you now. You may consider yourself mine as I do, or you may continue to pretend my words haven't fundamentally changed you, but either way, I consider you mine while you are under my control.
Finally, there are my partners, the Good Girls with whom I share more intimate relationships. They undergo certain kinds of training designed specifically for them and give more than just their sexual expression to me. Many of my partners hope to join me and serve me in person. The state of the world, unfortunately, makes that a dangerous, if not lethal, proposition for some. I'm preparing them to give everything they safely can to me, including the parts they want to hide. They are mine and I intend to take over every last part of their minds and bodies until they are happy, horny, and helplessly brainwashed by me. If I understand your question, you're probably asking about this part.
For reasons I cannot explain with any brevity, my love is eternal. Once you have a place in my heart, it is yours and no one else's. That includes the people I have failed and the people I have lost. There are many boarded up rooms that are left exactly as they were for Good Girls who will never return to them. Once I love you, I love you. It doesn't stop. It doesn't change. It is as certain as the ground beneath you and the sky above. I will never stop loving you and that is not a mercy.
I am one man. I am bound by time and the weakness of a mortal body. I am not perfect and while my love is endless, my ability to show it and to survive it is not. Taking on partners is a risk, to me and to them. Not everyone is suited to me, nor I to them. There aren't enough good people in the world to go around. There are so many of you who have been mistreated, harmed and lied to. And if I could shred myself to atoms, I would if it meant that you could be loved and cared for in the way you deserve. That isn't how it works, but my instinct is to try and that means I fail. I fail to protect you, to protect myself and it ends in a boarded up room in my heart. If I'm not careful, I could get boarded up inside.
So if you want to be my Good Girl, really think about what that means to you. Understand that the closer you get, the more dangerous it becomes. You don't have to be the one who gives up your normal life to be mindfucked into blank obedience and eternal submission to me. You can be the Good Girl who spends her nights rubbing to my words or the Good Girl who is excited to tell me about your accomplishments. You can be the Good Girl who chases your own dreams because Daddy wants what's best for you. You can be the Good Girl who doesn't say anything at all and comes back just to drift in that thoughtless, orgasmic bliss. No matter what kind of Good Girl you want to be, when you are here, you are mine. That's the honest answer.