An expression that might be a smile comes over the monster's face in reply. At the least, the earlier tension is quite gone from its bones. It nods in acceptance of Frisk's refusal, then it jerks its head towards another branch, "You mind?"

If the kid is content to stay there and the monster is content to eat, then it sees no reason for either of them to relocate. Most of its hunger has been sated, but if the fruit is right here, might as well eat its fill now. It'll save time later.

It doesn't even need Frisk to shake the rest down. Upon receiving confirmation that they do not mind, the monster will just go back to eating fruit right off the branches.