The biologist in me wonders what would happen if our little Yukionna continued clinging to Toma for too long, in effect gorging herself on his limitless endurance.
Would it just leave her satisfied for a longer period before needing to eat again, would the excess energy be stored on her body in a similar to fat, would it supercharge her magical abilities?
And if it's the second option, would the magical energy stores be used as emergency stores to prolong her survival without absorbing vitality, and could it be used to further increase the absorption rate of energy, given what she stated about more body contact increases said absorption.