Even Vali looked at this situation a bit shocked, as this was certainly an unprecedented situation.
This wasn't a reaction that he was awaiting, as normally, from what he heard, normal people, most commonly humans, tended to freak out and be frightened... not to be hyperactive and delighted at seeing a devil.
Not like he did anything to forbid it to her, as he let Bellatrix pet his wings and touch his horns.
"How are you keeping them hidden all the time? Is it some sort of illusion? No... that wouldn't solve the material aspect of the hiding... perhaps transfiguration?"
She rambled the possibilities as he nodded at the last one.
Devils could use sort of innate transfiguration magic to hide their wings, tail and horns to either blend among the humans or just to hide them because always walking with their huge wings was impractical.
At the same time, during the combat, sometimes the tail was considered as a weak point, especially for the younger devils, who were not that strong and or for devils who didn't have enough combat experiences.
"Transfiguration. All devils are gifted with countless innate racial abilities; one of them is transfiguration magic that lets us basically hide the horns, wings and tail or tails whenever we wish."
When he retraced his wings, tails and horns, he right now appeared indistinguishable from the average human.
She then ran a circle around him, observing him from all sides, before she stopped in front of Vali and looked at him with an inquisitive gaze.
"That was so... exciting..."
She managed to say as Vali tilted his head.
"I wanted to ask... would it be possible for you to teach me some more combat magic?"
Vali could see the excitement in her eyes when she asked for him to teach her magic because she saw how powerful he was and Bellatrix always pursued the power in the magic, the power that he wielded like water.
"That should be possible..."
Vali stated after a short time of consideration, this could be a good opportunity to spend some time with her because while he had chosen her to become his wife, the more forceful approach was to his disgust.
He preferred to develop their relationship step by step, time by time.
And he had enough time, virtually all the time he wanted, though at some point he needed to return back to the Baator, so he could at max stay in the world for about few hundred years...
Right now, in the Astral Boundary was nothing to do, as the Chthonian Empire of the Baator and Dresden Arcanum Empire lacked any enemies or competitors as they ran rampant through the Universe.
Thus Vali could remain outside of the Empire for some time.
"That shouldn't be any problem; I could visit a few times a week if you want and if you want to fight against someone who could prove to be a challenge, then visit the Malfoy Manor where I am currently staying..."
Vali stated because having her fighting against him wasn't exactly fair and she would not advance that much if she continued dueling Vali because he was too strong.
He planned to have to spar with the Walpurgis Knight Order members, especially considering that even now, as she was, she could probably beat most of their members, aside from the Grand Knights and some of the stronger Knights.
Against average members?
They would stand no chance.
He noticed that Bellatrix Black was very skilled; magically, she was more powerful than people of the same age and she had a very good affinity for combat; her instincts during the battle, as he noticed, were top-notch, considering that their entire society wasn't battle oriented.
"Really?"
She barely could contain her excitement because her father had never had her fight in a real fight against anybody, always in simulated duels, but those were boring.
There wasn't anything exciting about a duel; there wasn't that thrill of battle, that excitement and that indescribable feeling that Vali knew well.
"You could fight against the members of the Walpurgis Knight Order during their training drills... they would prove a good challenge and at the same time, it will motivate them to train more if a teenage girl kicks their asses."
Vali said with a smirk as he thought it over because this would be a good tool to motivate them to train more. In the Chthonian Empire, sometimes, if needed, similar tactics were used to motivate the contingents of soldiers to train more.
And it worked splendidly every time, so Vali knew that it would be working this time too.
After that, Vali spent some time there talking with Bellatrix as she was asking some questions about the devils, Baator, Magic as a whole and some other things.
He answered before he even realized they had spent several hours talking as he then walked her to the fireplace, which served as some sort of teleportation point.
He really thought that the Wizarding means of transportation were weird, like very, very, very weird. Nevertheless, he accompanied here to the fireplace as she flashed away to her home in a wave of green flame.
"I can take it that everything went well with my granddaughter?"
Vali then heard the familiar voice of Arcturus Black, who was standing not far from the fireplace as he nodded at the elderly wizard-turned-devil.
"She is exactly like my aunt Hela... that fighting spirit, thirst for power and battle-lust are something that are impossible to hide in her person."
He answered with glee in his eyes as he thought about Bellatrix Black, the last time he had a similar feeling like this was when he met Rias, as she was the last one to become his wife together with Kuroka Tojou and Latia Astaroth.
"That I can only await the good news..."
The older man was in a jovial mood because he had made a killing today from all of the meetings he had.
Not only did he become a devil, but he also got half-raised to nobility within the hegemon like the Chthonian Empire and one of the most influential people of the Empire who was also the son of the Father of All Devils took a fancy to his granddaughter.
'Andromeda and Narcissa are a must... they would prove pivotal in securing alliances with the Noble Houses of the Empire... though who else?'
The elderly Lord Black thought as he departed to his study after Vali teleported back to the Malfoy Manor.