I experienced something similar since one of my friends was 12 years old(I distinctly remember him running his fingers over her nipple a couple times.), he was two years younger than me, well you read the post.
It was insanely awkward, my heart still thumps sometimes when I remember it, but I never had it again.
The funny thing is that I just like this kind of fantasy, for example, I find someone's mom and break her will, make her my sex slave, and at the same time I am about 14 years old(that's not my age.), and her son 17-18.
Sometimes I like to fantasize that my mom is somehow miraculously dating teenagers, I don't have a strict fetish about someone fucking my mother, I just like to fantasize about different things.