He doesn't want to fill in what "stuff" is, he doesn't mean to wonder at it, however briefly. But his cheeks flush and his gaze skitters away for a moment. Claude continues, saves him from his own curiosity, thank goodness.

"So the tree house wasn't just your penchant for heights." Soft and amused. "It sounds like it... That is something this place has in abundance. Freedom. It's something I've spoken with Byleth about as well."

Lorenz wraps an arm around Claude, giving him a sympathetic smile. "I'm sorry you lost that... And them. I can't imagine how much that must have hurt."