enriching situations for characters who are deadly terrified of being vulnerable around others:
being gravely wounded and having to put their life in another person's hands. either fighting back with the last of their strength, or being too weak to protest when someone undresses them to take proper care of their injury
having a panic attack around (or caused by) another person. the fact that they're seen by someone like this only intensifies it, making them hyperventilate more
sleeping next to someone, trusting that they won't do anything to them. likely still going to wake up multiple times during the night at the slightest movement or sound
facing a fear/phobia they have and trying to remain composed as to not reveal their fear to everyone.
getting sick, feeling weak and utterly helpless. passing in and out of conciousness. flinching instinctively as someone checks their temperature
having limited mobility (ie. due to injury). needing to rely on someone else to help them move and do basic daily tasks. taking a bath together and allowing to be gently washed
bringing someone to the place they were raised in, allowing them to see into their past and judge it for themself.
