I have an autistic collection of cute naked mirror pictures

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I have slipped into another autistic obsession/repetitive task

>constantly seek out pictures like pic related while fapping
>don't really even fap to the pictures
>just hoard them in a single folder
>hardly even look at them, just collecting them due to autism

They must be:
>a girl around university age (a little older is fine but nobody noticeable middle-aged)
>taking a picture of themself in a mirror
>visibly holding a camera
>at least partially nude (must be showing one or more of ass/tits/pussy)
>not a "professional" model/pornstar/etc., must be passably authentic
>minimal/no tattoos

I have a big fucking folder of this now. It serves no purpose. Like I said, I barely even look at it.

Why do I do this?
Is this autism or something else?