(((Kaika))) I do the same thing, and my T and I agree that drawing on paper is just not the same. As an artist, I think that there is something strangely beautiful and expressive about drawing on one's own body. My teachers don't like it when my friend and I draw on our hands, though, because she says we'll get ink poisioning. But it does help, so I have no regrets
I'm glad you've found an alternative to SI
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Only you can prevent neurotypical jerkiness!