Namaste all
If we think of the fact that we are all connected at higher level and one with God at all levels, there does not arise the question that we are violating anybody's "space". We are all already in each other's space consciously or unconsciously. Only in the physical realm we are seperate and even without reiki, we are sending each other all kinds of energies and accumulating karma depending on the purity of our thoughts. So pure thoughts and reiki are the same as long as we use them prudently.
Mal