Killua said:
..Bondage/restraint and Dominance
Good choice.
I really like lots of kinds of dominance, whether it's me as the dom or sub. It really turns me on to fantasize about being overpowered and made helpless as a guy "puts me in my place". I've often fantasized about being a warrior or some other empowered woman who gets humiliated by a man. He defeats me and strips me naked, making me feel ashamed of inferior female body. Being tied up is just the icing on the cake. I'm turned into a sexual object, unable to defend myself or cover up my body.
And it's the same when I'm the dom! I love the idea of watching a boy panic as he realizes he's being overpowered by a stronger girl. I want to hear him struggle and whimper as I crush his body and his male pride. I want him to cry as I rape him and my him my bitch.
As for how I got these fetishes, I think they're not uncommon, especially being dommed. But the bondage kind of came about with me playing with myself in my room. I'm too afraid to tell any potential boyfriend about my fetishes, but when I tie myself up I can experience a bit of that helplessness without it being to real. So I do that a lot.
My fantasy of dominating a boy might have come from an experience a couple of years ago. I had a crush on a guy but was too afraid to say anything. I wanted him to show interest. I tried to get his attention, and I soon tried play-wrestling with him. He was kind of shy, but that just made him fun to tease. But the more I did it, the more physical I got. Nothing overtly sexual of course, but I wanted him to feel my body and I wanted to feel his. I don't know if he was just too scared to try too hard with a girl or if he really didn't know how to handle himself, but I would usually end up on top. I loved that feeling. I think that is what startled me on femdom. In my head, I didn't just pin him.
Sorry for writing such a long response! I guess I answered three fetishes instead of one (but you WERE vague!). Okay, so now someone will look at your faves and ask you!