Victor takes over

"Let me possess her." Victor told his apprentice.

Lillia looked at him dumbfounded. Did she really hear him right? Did he just say he wanted to become the Succubus? "Master..." She trailed off.

"Look I know what you're thinking, but you are clearly worried you might lose control, and we can't just let you leave her. We don't know what will happen if she wakes up." He rationalized. "Besides, between the two of us, we both know, I can focus better."

"Well...when you put it like that. It does sound reasonable." Lillia noted. "Are you sure you don't have any alternative reasons?" She asked warily.

"Well, I’m planning on running some tests on her body and seeing if I can find any useful data on her physiology." Victor admitted. "Some of these might be painful, so I'd rather not have you piloting her body to avoid hurting you."

"That's not what I meant." Lillia sighed. Leave it to her master to be so dense. "You know what? Never mind. I was worried for nothing." Lillia told him. "So… how do we do this?" She questioned.

"Observe." Victor told her, as he commanded her actual body to come over. He began to draw a magical circle with her empty body mimicking his movements. Once the circles were complete they combined before erupting into a flash of light.

"Tada," Lillia's body said, or rather Victor in Lillia's body announced. The Mage's body soon collapsed on the ground shortly after, much to both of their shock. "Hehe… oops." He, now she, laughed nervously as they both went to help the mage's former body on to the bed. "I forgot how tired I was, and how strenuous the spell is." She admitted.

"How did you do that so easily?" Lillia questioned.

"I just used what you told me, but refined my intent from puppeteering it to possessing." Victor admitted in his new female form. "I must admit, it was a far more successful first attempt than I expected, but I suppose I shouldn't be surprised. Now all we need to do is perform a body swap spell and we should be good."

"Why do you know so much about these kinds of spells?" Lillia questioned.

"Believe it or not, the body swap spell was one of our first considerations. The idea being that we'd switch places with the demons and use their bodies for espionage. The plan was shot down on account of several factors. It was difficult to perform on unwilling parties, so it required capturing and incapacitating the targets to use, and was genuinely seen as difficult to maintain due to the need for imprisoning a demon in a human body. There was always a chance that the demon would commit suicide and leave the human trapped in their body, which did not bode well." Victor explained.

"Well that's not at all disturbing to know." Lillia winced.

"It's far more disturbing when you see your loved ones reduced to lifeless husks before your eyes. Or when you see you family get turned into a buffet." Victor answered sternly.

"Sorry...I didn't mean to sound like that." Lillia apologized.

"It's alright. You didn't know better." Victor assured her. "Now let's hurry up and switch. I don’t intend to stay in your body any longer than I have to." He told her as he crossed his arms on his new chest, trying his best not to be bothered by his new breasts.

"Right… Well then, let's start the switching spell." Lillia said. The duo repeated the process once more both drawing the magical circles, and soon the spell ran its course.

"It worked!" Lillia cheered as she looked down at her own two hands once again in joy. Never had she realized how much she'd miss her own skin. "But why do I feel so tired?" She wondered as her body felt heavier than before.

"Well… let's see… you used all your mana to possess and seal a demon, then your body was left vacant for a few hours. It's not surprising you'd be tired given how you drained yourself physically and mentally." Victor informed her, as they put a hand on their new hip. "Why don't you go back to your chambers and get some rest for the night?"

"Yeah… that might be for the best." Lillia answered as she walked to the door. "I'll see you tomorrow Master." She bid Victor farewell, as she left their study. Once she was gone, Victor made sure to go and lock the door, ensuring no one would disturb them for the rest of the night. They observed through the peephole as Lillia left the area. Once she was out of sight, Victor let out a breath they hadn't realized they'd been holding.

"Finally, she's gone." Victor smiled as 'she' walked over to the mirror to examine their new body. A malicious smile formed on their new face. "Well, well, it looks like I did control you after all." Victor chuckled in their new sexy voice as they rested a hand on their hip.

"I must admit, you were right. Your body was superior to mine, but clearly your mind wasn't." Victor could already feel the difference in strength compared to their old body. It was lighter, stronger, more nimble and so much more powerful. Victor's new wings started to flap slowly and soon they found themselves hovering off the ground with ease.

After making a few laps around the room, they landed lightly on their heels. "Your body will serve me well. Serve me well indeed." Victor smiled as they licked their new lips.