I had maledom/femsub dreams from an early age. Before I even understood sexuality.
My basic nature is to take charge in a vacuum. If no one else wants to lead, I do. If someone is leading poorly, I want to take over.
But more than that, the emotions and pleasurable feelings that wash over me when a woman's body language, her eyes, or her words, show that she is giving herself over to me... for my protection and for my pleasure, is nearly overpowering.
How did I come to realize the sexual manifestation of it? I was with a vanilla girlfriend, I was screwing her from behind and she was "stuck" in a multi-orgasmic fugue... and couldn't stop... and as she became exhausted and began to beg me to let her rest... I realized that I was in total control of her body... and it created a huge surge of lust and energy in me... and I pushed her harder and harder and forced her over into more and more orgasms.
I couldn't stop myself until she was in a crying heap...
Now I have a bit more self-control... and have learned the wisdom of safewords... not that I think she would have actually used one that particular instance... and yes... she came back for more.