When I was young, I always wanted to play "evil doctor", but as a patient. Growing up, and curious, I started looking for video of "evil doctor" or "evil dentist" on YouTube, I was 8 years old at the time I think. That's when I discovered lots of video about torture, kidnapping... Of course, they were always films' scenes, but I was so aroused, I didn't understand why I liked them so much.
I would fantasize of being tied, gagged, kidnapped with chloro... But it would end there. Of course, I still wasn't very aware of sex and didn't even know what bdsm was, nor that something like that would exist.
Eventually I forgot about it for a few years, then once I found a fan art on Facebook of the anime "euphoria", and I felt that feeling again. I was curious. Aroused.
That time, I watched my first porn, my first hentai, and I discovered bdsm.
Now my childhood fantasies would at last go on... They finally have their sequel.
That's when I realized I LOVED bdsm and being sub, my fantasy never stopped growing and even now, (I'm 19), I still have new idea sometimes and new fantasies.
Also, my mother told me that when I was 4, I wanted to go around as a puppy, wearing a collar and leash.