I was looking for some angsty OTP questions and couldn't find any, so I decided to put together my own. Obviously more mundane, normal couples might not have good answers for a lot of these, but for a certain kind of people...
Free to use and all that jazz.
What is the darkest secret they know about the other?
Do they have any dark secrets from each other?
What is something they could never forgive the other for?
What is something that could actually destroy or end their relationship?
How do they each express their anger? Which of them is more dangerous?
Are they each able to hurt or kill someone? Under what circumstances - only to protect their partner? Could they even to protect their partner? What do they each think the other's answer would be?
What is the worst or darkest act they have committed together (or with the knowledge of the other)?
What is the worst thing they have been through together?
What is the worst thing they have done or endured for the other? How much does the other know?
What is the worst they have hurt they other? What could cause them to intentionally hurt each other?
What are some of their worst qualities, individually and as a couple? In what ways are they toxic or bad people?
People are complicated - now justify or excuse those bad qualities.
How are they good for each other's traumas?
What's the most vulnerable they have seen the other? How did it make them feel?
What would they do if the other died? How would that change them?
Bonus: Having spent all this time talking about how they are bad people, say something admirable about them. How are they impressive? How are they good together?