[NSFW] Who invented this stupid thing?!

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Emilia's reasoning for making such an unusual request was obviously to prevent the older girl from drinking and draining her of too much energy. Even if Emilia orgasmed, it wouldn't cause a loss of energy unless someone licked up her love nectar. It would just turn back to energy and return to her body in a few minutes.

By her estimates, doing the things they were, Samantha should still be able to take enough to completely clear away her minor injuries. That is, if they hadn't already been healed. 

Although Emilia had been quite diligent in cleaning and wrapping up her big sister's scratches, the only purpose those bandages served was to hide the rapid disappearance of her injuries.

In terms of energy loss, though, it should probably be small enough to not even change the observable value.