"I wish Kakashi came around more often... He was better at lightning style techniques than I ever was." Itachi sighed a little. "But you are focusing your energy in the... high frequency vibrations of your chakra... So at's probably where the tingling sensations come from. Don't push it too hard though... and stop if you start feeling numb in that limb."

He nuzzled Sasuke again.

"My hand was asleep for two days once when I was back in the Academy... Not that Mother or Father ever found out!"