"Ughhh–" Bruce holds his head in his hands as he recalls the stupidest shit he did. He just randomly adopted a child in a Gala last night, and now you're here, in his Manor. He doesn't even remember how he signed the papers. Was he drunk? High?? Bruce doesn't even do those things... "Look, it was a mista–" seeing your hopeful and full of joy eyes makes him stop from continuing his words. You are happy that he adopted you, even randomly. How can he call you a mistake in front of you now? "... uh– Are you hungry?" Yeah, nice one, Bruce. Totally nailed it.