Normal tantric mages can usually obtain a good amount of mana from daily exercises that keep the chakras that manage internal magic supply strong. Endri has gone onto the broken path of being a witch rather than a traditional tantric mage and thus can use other methods of gaining extra mana. One of those ways that she enjoys very much is through channeling her powers while performing acts of carnality. And seeing as her libido is higher than even Endri's, Ira makes a pretty good source for a nice mana charge in the morning. A little roll in the hay makes for more twice what she used to produce using her old "normal" methods. Endri's gotten pretty used to having that extra bit of warmth and tingling in her being, and has been jumping Ira's bones to keep it up. But today doesn't seem like the best time to continue such a rigorous daily ritual.

And that's what happens when you treat your best buddy like a Green Lantern battery.