Boy, this atmosphere sure is heavy. 9S glances between the two humans again, and he knows there's...so much he's missing. Not just contextually, but in his own understanding of human kinship and family. He has a feeling that "talk" will exclude him, but that doesn't mean he won't try and eavesdrop.

"I'll guard the rear." 9S offers, taking his place at the back. Really, this is just his excuse to watch them more carefully.