In my own 2nd grade (US) class, there was a fairly pretty girl who was absent for many weeks after an accident she'd had.
We were told she'd hit her head and forgotten who she was.
I would have been 8 years old at the time. I felt genuine sympathy and concern for her. I imagined taking care of her myself. I'd never felt anything for her before then. Now I daydreamed of nursing her back to health. It was strange, and I never forgot it.
In the quiet of night, this suddenly turned into fantasies of romance, kissing and whatever else I was aware of. It was all very innocent, but I was obviously drawn to her vulnerable state while nursing her along, and there was probably some arousal over it which I wouldn't have understood at the time.
Was this something terrible and with ill-intent? I don't believe so. I found myself falling in love with her for her vulnerability. And though I can't articulate it, I think it was an early hint or precursor to my adoration for young girls later. There is some connection there, though I do not know what it is.
Like a classic second rate motorbike though, never give out.
Fight The Good Fight.