Progress?
Uncurled in my son's lap and tried to escape and then I picked him up with two hands, rotating from supporting chest-ish to tail as he moved and eventually he wrapped around my arm. Sign of comfort? I transferred to my son and I noticed as I helped my son support him, the snake would more readily wrap around my hand so maybe that's a sign that he has a new association with my scent?
Anyway, definitely the most action we've had in 2 years!