Robin had kept his curiosity at bay as best he could. With how mysterious, and how unsubtle Much's behaviour had been, it wasn't easy. But he did his best to keep any remaining questions to himself as he walked through the trees with his friend. He was quite impressed at how well Much had done at holding his tongue. Though what he and Lydia could have been working on, in the forest.
They stopped at a tree, and Robin first glanced at his friend curiously, before his attention was pulled back to the tree (obviously what his friend wanted him to see), and he moved around it, until he caught sight of the rope hanging down by the trunk. His eyes followed it upwards until he saw the tree house. He had to take a step back to see it more fully, and when he did he looked back over at Much.
"You and Lydia built this?" He asked with a smile.