Because it would be a waste

Of cause he could charge into her room and take what he deserves. But it would be the same as if a man devoured an expensive wine to get drunk. And if he would visit Mira now, in that state, he'll just drink her all. More and more

No, incubus needed to satiate his hunger before visiting the paladin. He spent nany hours in his harem and later in the dungeon, exhausting dozens of females that could satiate an army of mortals. And with any of them he imagined Mira on their place, only one time in his life demon was so obsessed by only one female. And that female was the chained Goddess of Sun herself, when Marus was young and inexperienced, serving one of the ancient demons

It's hard for incubus to get tired of sex, but as human can get bloated of food, Marus managed to bloat himself with energies of lust and had no desire for more...

When he entered Mira's room paladin prayed, but paladin stopped the prayer immediately, when she noticed the incubus. "I think it's time" She said with an alluring sad smile. " I am ready for that, Incubus, but before you start, please, answer me. Why do you treat me like that? I was your enemy and you are being of the pure evil. I expected a **** for all the troubles I created for you. Instead, you treat my like a noble ruler would treat a noble prisoner. All that silk, luxurious food and comfort. Why?

Marus smiled back " Mira, torturing you would be a stupid way to waste your beauty, something that I intend to save for my own use"

" Then..." Mira looked confused but determined to get the answers" Why don't you act like a demon of lust? Why didn't take me on the spot? I heard that Incubuses are beings of a pure lust and can't control their urges, that you feed when you violate a woman"

Marus continued to smile "You studied your enemy good, but not good enough. Yes, many incubuses do feed in that primitive way. They get a vixen, **** her and let her die when lust is temporary satiated. But you see, energy of own lust is good. Demon like me can survive on that. Survive, not get stronger or healthy. No, smart demons like me look for other sources of lust. One is the lust of subjects and minions, another is corrupting mortals to make them follow my ways... But true source of my power are women. My harem, my slaves, that lust for me. It's the best kind of lust. Women is my source of power, I wage wars to get them. To get ones with strong souls and gorgeous bodies. They taste best. Like you, like priestess Aleira, like princess Tara , like some other women in your kingdom"

"That's why you wanted me to... pleasure myself. To get your food? Was it tasty?" Mira followed with more curios questions

" Yes. And Yes. It was tasty, especially because you dreamed of me.. Not quite real me, but that doesn't matter. You desired me" No **** ever asked such questions, no **** would get true answers, but somehow demon wanted to be honest with th paladin

"Before we start your... feeding. Tell me how did you broke me so easily? I know what desire is, I always was tempted to abandon chaste ways and was attracted to many handsome men. But you... The demon showed me what real passion mean. I never imagined that I may want anyone as badly as you. My soul knows that it's so wrong, but my body demand you, my body want your touches, my body want to give away my virginal blood. It wants to be yours. To scream words of pleasure in your arms. How? Explain how did you corrupted me so fast. And start enjoying the falling paladin? And I will give you all the lust you need" With the last words Mira blushed and looked down, that was a blush of a shy innocent girl in her wedding night. Despite all her mental strength, Mira was just a scared and anxious virgin in that moment.

And Marus understood that all that satiation he had, didn't suppress his desires enough. This one innocent blush turned him on more, than dozen of half naked harem girls dancing for him with all their skills.