Hashirama perks back up and follows him to help with the harvesting.
They're not able to set out before nightfall, and Hashirama curls up a respectful distance from Sasuke with a nest he's made out of seaweed. They'll be bringing the building supplies, too - no sense in having to redo all the preparatory work, and not everywhere's going to have the same resources.
Hashirama's currently humming, having finally figured out how to coax his Mokuton - he's still not having much luck with the soil here, it lacks something apparently vital, but growing a bowl from his arm wasn't too hard after a bit of experimenting. Seaweed-fruit soup is surprisingly good.
"You know," he says, humming happily, "I'm glad to have gotten dropped alongside you. You're a good person for this."