When Hawks uncharacteristically doesn't show up to a meet up with Dabi, he decides to go and see what's keeping him. When he finds Hawks blacked out drunk and with tear tracks on his face, what else can he do but try to find out what happened... and maybe help.
When Dabi is chilling at Hawks' house, the room a bit tense, Hawks was not expecting to hear some earth shaking news about the true context of their "relationship". After all, you wouldn't expect a hero's soul mate to be a wanted villain. One shot.