[ He follows closely, as he always does. 9S feels plenty of doubts and is likely nervous enough for the two of them. But he maintains a demeanor that suggests otherwise, at least while they're technically under the watchful eye of yoRHa. 9S lands with a delicate huff shortly after 2B, standing upright and dusting himself off. ]

Really?

Huh. I never really took you as someone who felt insecurities. Given the circumstances, I shouldn't be surprised. It's basically uncovered ground we're tackling.

[ He pauses, walking closely beside 2B through the cavern. ]

Attain? Uh...

[ 9S ponders, putting his hand to his chin. He's genuinely considering an answer, analyzing the feelings and thoughts that go behind their arrangement. And though he's still nervous as all hell, he keeps that analytical side to prevent him from losing his mind. ]

I... Don't know. Humans who maintain frequent intimacy often end up a couple. I know there are androids up in the Bunker who are in relationships.

If... That's something you're into.

[ He literally knows no other way to ask. ]