like when my parents first adopted their dog she had been a breeder dog and she hadn't been abused but she had had extremely little social interaction ever and had spent most of her life inside in the same five kennel rooms. so when they first got her and you started petting her, her eyes would go incredibly wide and she would instantly just freeze up. there was not an ounce of aggression in her but she was so mystified by what was happening she had a sort of deer in the headlights reaction like "maybe if i stay incredibly still for as long as i am capable whatever is happening will stop. or... will not stop? i'm not sure what is going on, and i'm scared, but the longer it happens the more i realize i want it to keep happening." and that's how i conceptualize a lot of my undersocialized blorbos' relationships with affection also