Inigo seems find with this situation, really. He will even allow Esteban to hold his hand the entire way there if he wants, because Inigo sure isn't pulling his way. He's also not making any active movements to hold the other guy's hand in return, but at the very least that means his hand will keep resting in the other's as long as Esteban is holding onto it.

Then again, Inigo not actively holding someone's hand is very much not like him. Nor is the way he just stares ahead of them while Esteban talks, rather than actively glancing over at the other while he walks.

(He's fine with this though - Esteban just babbling on, Inigo not even needing to fill up any potentially awkward pauses with words of his own. He can just listen as he walks. It's easier to not talk right now, anyway.)

It's only when Esteban finally seems to grow quiet that Inigo slowly speaks up.

"What's a Naming Tree?"

Hey, at least it shows that he is actively listening to the other, even if it might not show much in Inigo's current behaviour and weird emotionless facial expression.