Both Fisk and Matt suffer from nightmares because, well, they both have terrible lives. But the thing is that they don't realize that the other one does have nightmares. To Matt Fisk is the devil, to Fisk Matt is this avenging angel who barely seems human. Why would anybody that obviously DIFFERENT have nightmares?
Cue one of them (or both of them!) discovering that the other one has nightmares - be it Matt breaking into Fisk's apartment, or Fisk taking Matt prisoner, or some post hate sex thing where both of them kind of forgot to keep their guards up - and the other one waking up mid realisation, cue the both of them being rather confused by this, cue the both of them realizing that maybe they have more in common than they think...
And then H/C? Because they both know how to calm themselves down from nightmares, and it's always easier with another person around. :DDD
Fisk/Matt - nightmares, hurt/comfort after nightmares
Cue one of them (or both of them!) discovering that the other one has nightmares - be it Matt breaking into Fisk's apartment, or Fisk taking Matt prisoner, or some post hate sex thing where both of them kind of forgot to keep their guards up - and the other one waking up mid realisation, cue the both of them being rather confused by this, cue the both of them realizing that maybe they have more in common than they think...
And then H/C? Because they both know how to calm themselves down from nightmares, and it's always easier with another person around. :DDD