What exactly is a "vanilla sub?" I'm not familiar with this term. It sounds like an oxymoron. Maybe?

The OP clearly states that they are only fascinated with spankings done to "minors." They do not want to be spanked. I think that line is pretty clear in the post. Maybe after understanding this "part" they can continue their exploration of it.

OP.....if you're still looking for answers, I think you might try researching "imprinting" in general psychology. It happens to all of us especially when we're very young.
When you hear these stories does it lead to sexual arousal? Or is it like a car crash & you just can't turn away?