Following a lengthy discussion, Vahn concluded the easiest and fastest way to prove his assertions while simultaneously giving Yamato a taste of freedom was by letting her see and experience another world, specifically the beach of his resort in DB-0769(Dragon Ball).
"Incredible! Such a vast and calm sea! And the air is so fresh! I've never experienced anything like it...!" exclaimed Yamato, closing her eyes and taking a deep breath with her hands on her hips, causing her already large chest to appear even more voluminous.
"It's also markedly safer than the seas and oceans in your world," stated Vahn, revealing, "The largest sea creature present is a blue whale with a length of twenty to thirty-five meters. There are Saurians and even a few species of Dragons here on the surface, but they're generally not a threat to trained warriors or Samurai."
"Really? Then it's a shame I've consumed a Devil Fruit. I would have liked to take a dip and explore it," stated Yamato, maintaining a broad smile but exhaling from her nose with her hands on her hips.
"Here, take this," said Vahn, opening a Trade Interface, causing another to appear before Yamato.
"Hmm? What's this...?" asked Yamato, her dark orange eyes gleaming with intrigue. Vahn had explained most of the Tower System's functions to her, but she had yet to use them.
"The window is called a Trade Interface, used to facilitate exchanges or sales between Ascendees without having to physically produce the items or currency being exchanged," explained Vahn, appending, "And the item I'm gifting you is a special drysuit that allows Devil Fruit users to enter the sea without having their power inhibited."
"Aha! To think such a thing would be possible...!" exclaimed Yamato, her eyes glistening with even greater intensity as she eagerly accepted the trade and, rather abruptly, started stripping down.
"Don't forget about the Equipment function," stated Vahn, calmly noting, "Since it's considered an undergarment, you can drag the drysuit into the slot currently occupied by your fundoshi. There's no need to strip naked, though I wouldn't mind seeing you do so."
"Hmmm? Vahn-dono wishes to see me naked...?" asked Yamato, staring back at Vahn with a puzzled expression. She initially found the admission odd, but when she recalled that Vahn viewed her as a woman, she faced forward, crossed her arms under her breasts, and raised her gaze to the sky with a serious, deliberative expression.
"No need to overthink things or force yourself on my account," said Vahn, stepping forward and patting Yamato's left shoulder before stepping past her, his yukata dispersing, replaced by a pair of two-layer swim trunks as he stated, "If you're more comfortable being a man, that can be arranged. The most important thing is that you're comfortable being yourself. Oden already lived and died how he pleased. The best way to honor and be like him is by doing the same."
Finished with what he had to say, Vahn leaped several tens of meters in a single bound before plunging feet-first into the sea. It was a little silly of him, but he got anxious sticking around after giving what he believed to be profound advice, so he decided to spend a short time at the bottom of the sea to collect himself. He found the pressure comfortable, and since he didn't need to breathe, he could remain there as long as he pleased or until something required his attention...
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'Hmm...?'
Sensing a powerful life force approach even without his domain active, Vahn opened his eyes and found Yamato coming to a stop and treading water a short distance above him, their gazes meeting. To his immense surprise, she appeared to be naked, but it was difficult to tell as she was covered in a shimmering and highly refractive layer, suggesting she had Yasaka or someone else cast an invisibility spell on her drysuit, making it appear as though she were hydrophobic.
Ostensibly in response to his dumbfounded expression, Yamato's eyes narrowed slightly, the smile on her face broadening before she released some of the air from her lungs, allowing her to sink and, surprisingly, sit atop Vahn's abdomen. Then, briefly leaving Vahn confused, she held up her hands with her fingers resembling claws.
'Did Yasaka or Venelana say something to her...?' asked Vahn, directing the question to Sis as he raised his hands to link his fingers through the orange-eyed and extraordinarily buxom beauty's. The moment he did, she immediately tightened her grip and rather abruptly pushed him against the seabed, causing a significant amount of sediment to shoot up as she appeared to be trying to overpower him.
Following his initial confusion, Vahn raised his knees, striking the back of Yamato's voluminous ass cheeks and thick thighs, causing her to tumble forward, her breasts briefly sliding across his face before she tucked her body, pulled his hands above his head, and attempted to hook her calves around his torso. At that point, Vahn was fairly certain she was attempting to assert her dominance or something similar, so he spent the better part of ten minutes wrestling with her on the seabed, causing the entire bay to become a cloud of disturbed sediment by the time she needed to swim up to take a breath...
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"Pwaaah! That was exhilarating...!" exclaimed Yamato, beaming from ear to ear as Vahn tread water a short distance from her, an incredulous look on his face as he asked, "What even was that? I don't mind wrestling, but I can think of a few better venues than a seabed..."
"Oh? Was that your first time as well?" asked Yamato, her expression one of genuine surprise as she blinked several times and remarked, "I thought Vahn-dono was well-versed in such things."
Before Vahn could ask Yamato to clarify what she meant, the horned Oni confirmed his suspicions and a fundamental lack of understanding on her part by beaming happily and humming, "But I can see why so many spend all their free time and money at the pleasure hall. Sex is very pleasant. We should do it again sometime."
"First off..." started Vahn, smiling wryly as he affirmed, "I'm honored that you would be willing to have sex with me, but that most definitely wasn't it. Sex is when a man slides his penis in and out of a woman's vagina until semen is produced. What we did was enjoyable, but it's nothing compared to the pleasure that accompanies intercourse..."
Holding her left hand up to her mouth with an exaggerated expression of shock, Yamato, wide-eyed, exclaimed, "I had no idea! Do you mean to tell me fucking and having sex are the same thing!?"
Finding Yamato's shock endearing, Vahn's smile softened but retained a hint of wryness as he nodded affirmatively and explained, "Fucking is just a colloquialism. There are forms of sex that don't involve inserting a penis into a vagina, but even they involve considerably more than wrestling and holding hands..."
"What a heinous misunderstanding...I am ashamed..." muttered Yamato, her cheeks tinting red as she closed her eyes, ostensibly to avoid meeting Vahn's gaze.
"It's not that big a deal," assured Vahn, offering a supportive smile as he stated, "Life is about making mistakes, learning from them, and acquiring new knowledge. You are doubtlessly stronger, wiser, and more educated now than when you were still a child, and you will continue to accumulate strength, increase your knowledge, and grow as a person moving forward. I guarantee it."
"Of that, I have no doubt," affirmed Yamato, nodding before opening her eyes and smiling apologetically as she revealed, "This issue is that, while I was keen to have sex with Vahn-dono, I believed it meant sharing drinks and entangling our bodies in a battle for dominion. I was aware such acts could lead to fucking, but now that I know the truth...I have inadvertantly burdened you with expectations I may be unable to requite..."
Shaking his head, Vahn casually countered, "As much as I am certain we would both enjoy ourselves, my only expectation is that you walk the path of your choosing, preferably as yourself. You've lived your life with enough fetters. I have no intention of tying you down."
Swimming forward, Vahn punctuated his statement by extending his right hand to caress Yamato's head. She was initially surprised by this, but like virtually every other recipient of his caress, she narrowed and then closed her eyes with a contented smile...
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After introducing Yamato to and leaving her in the care of his harem, Vahn made sure to reward Grayfia, Venelana, Misla, and particularly Yasaka for their support before electing to spend the remaining time until the Tower's opening with Lupheria and another of his adoptive daughters, the leader of the Sisters and youngest of Misaka's clones, a girl who originally went by the name Last Order but had since adopted the name Lastia. She was the reason the other Sisters referred to him as a pervert, not because he had done anything perverted, but because Misaka Prime had freaked out when she originally proposed calling him Chichi(father). He was fine with them doing so, but that only made Mikoto more flustered, resulting in her labeling him a Super Ultra Platinum-tiered Pervert Dragon God and many variations of the title...
"'When is Lastia going to be allowed to enter the Tower?' asked Lastia, as Lastia was eager to become stronger," stated Lastia, hugging a stuffed frog nearly as big as she was and kicking her feet as Vahn stood behind the chair she was seated atop, brushing her short, chestnut-brown hair in preparation for bed.
"Once you're older and have completed the same basic training as your older Sisters," answered Vahn, referring to the seventy-two Sisters that had entered the Tower, mostly to assist with personnel shortages and to fill the role of Receptionists. There was initially just one, summoned using Mikoto's TP, but as that Sister gained the requisite TP to summon another, their numbers steadily increased to the point they were now preparing for the original four summoned to become Ascendees.
"'Mooou' protests Lastia, preparing to gain sympathy from the Perverted Benefactor by puffing her cheeks adorably..." stated Lastia, immediately followed by her puffing her cheeks.
"That's just further proof that you're not quite ready to face monsters..." hummed Vahn, gently grabbing the sides of Lastia's head before kissing her crown. Her and the Sisters' speech patterns could be a little tedious, but with the appearance of an eight to ten-year-old Mikoto, her cuteness was railgun-grade. Unfortunately for her, it often misfired, as she typically only employed it when asking for the difficult or impossible.
"Lastia, behave..." said Lupheria, sporting a serious expression as she sat atop a nearby bed in her cute, pale lavender and white pajamas, matching the set Lastia was wearing.
"'Lastia is behaving,' asserted Lastia, raising Lastia's voice and stressing Lastia's words to reinforce the sentiment..." countered Lastia, leading to her and Lupheria staring each other down with unintentionally adorable glowers.
"Now, now...let's not get ourselves riled up before bed..." said Vahn, his expression and tone gentle as he picked Lastia up by the pits of her arms and habitually placed her onto his shoulders even though it only required a few steps to reach the bed. In response, Lupheria immediately moved to the edge of the bed and raised her arms while on her knees, prompting him to pick her up and hold her like a koala before spending a few minutes swaying his body from side to side and dancing around slowly without his feet touching the floor until both girls invariably became sleepy. Lupheria succumbed first, as it was markedly more comfortable being held, but she didn't have to wait long as he had been utilizing a second pair of hands to caress Lastia's back, leading to the chestnut-haired girl slumping forward and holding his head until her eyelids became too heavy to keep open...
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