Jon held the stone tightly, "I wish that for the next week, I would be changed mentally and physically by the subconscious desires of others, but that I could consciously mentally and physically change anything around me."
(to make this clear, if anyone has an errant thought about, "Jon would be better like this" or "What would Jon be like if he were this" he will change. He can change things by willing them that way, but can't do it on accident. His will is also subject to change based on his own form.)