Of course this only applies to those of you that actually like loli's. I have a feeling that some people that claim to be lolicons aren't actually lolicons so those need not reply.
I think it was in my senior year of highschool. I was 19. It was a strange realization. I just realized I preferred the lolis to anything else. At first I was ashamed. I told my close friend that also watches anime "I think I may be a lolicon." He just laughed. Anyway, that was around 2 years ago. btw, if it's not already clear, I'm only referring to 2D loli.

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