He has a teeny bit of sunburn
so he put his head on my lap and let me scratch his back (unheard of normally).
Then he said: 'Every time I said biscuit they put one in my hand'.
I said 'who did?'
He said 'At Opportunity Class'.
That was 3.5 years ago when ds was pretty much non-verbal. I haven't spoken to him about it since and I stopped it after too sessions for being nuts.