Sitting down to write this can be kind of challenging. It depends on what you call a D/s situation.
My first D/s experience by my definition was with my first partner. He grabbed my throat one day and I decided I wanted more of that. He wasn’t a Dominant, per se.
My first experience with a Dominant was with Daddy. He got me naked, tied me up, and used a Wheel on me. Despite my fear, there was trust built there. Trust that hasn’t been broken since. I can’t explain it, but if you’ve experienced it, you know it.