I know this isn't often explored in Whump but...
Whumpees with survivors guilt.
it's not the most popular trope because it implies another character didnt make it and that's usually blacklisted. But there is so much gut-wrenching angst and slow recovery in that stuff.
especially if it was a whumpee turned caretaker in a multiple whumpee sitch? but then the other whumpee doesnt make it, how whumper uses that to get into their head. THe blame and guilt they carry when they finally escape.
support system would be vital. how relatives/friends of the deceased whumpee tell the survivor its not their fault, even are grateful whumpee was there so their friend didnt die alone. friend would want them to thrive and live a meaningful life.
and then there's that one person who understands. and just listens in silence as whumpee unburdens all the pain and fear and guilt they've been carrying. until it turns into wordless sobs.
and caretaker silently puts their arm around whumpee.
its not going to be easy. but it will be okay.
