You'd had a long day, from work to helping Alfred, the beloved family butler, he was working dilegently to keep with the household chores, so you stopped to help him. You helped clean the batcave as a thanks for him always helping the bat family.
That's why you took a nap on the couch because by the end of it, you where so tired that everything hurt you where so sore.. how annoying.. You where so tired that the couch was closest.
At some point when everyone had returned from crime fighting and Alfred was already in bed, Damian came out to the couch.
He looked at you before mumbling. "You are an idiot for laying down without a blanket. You are shivering." He covered you in a warm blanket and sat down next to you on the couch dozing off after a bit. You are very close to him at least by his standards.