Start by Eating Jake Jake no Mi

Serafall Leviathan. 

While she might always appear stupid and obsessed with the "Mahou Shoujo," no one would underestimate her since her strength allowed her to get the title of the Leviathan, one of the four original rulers of the Underworld and leaders of the devils. 

Yes, the current Four Great Satans might be just a symbol, yet to become a symbol, one needed a qualification, and being strong was definitely the most important requirement since while it was quite vulgar and many people would disagree, no one would follow the weak. 

So, Serafall's strength was definitely undoubted, and one attack from her might even kill Masa. 

"...are you sure about this?" 

When they left for a quiet place, ready to start this test, Serafall couldn't help but ask Masa, especially when she realized how deep her feelings were. In the beginning, she just wanted to poke him for fun, thinking that it was funny for a little boy to wish to use her for his benefit. 

Yet, the fun had become a genuine feeling, and even if Masa might be a little weaker than her, so long as she could only be hers, then she was fine. 

"I do." 

"...then, you have become stronger than me." 

If Masa could repent, then it would be fine, but he was still stubborn, wishing for her to become one of his women. 

If so, then he had to show that he was stronger than her, or else it was impossible for her to agree! 

"Please attack me with everything." 

Why could all the gods and men have more than one woman? 

It was because all of them were strong. 

"...have you become a masochist now?" 

"....." 

While Masa was speechless, he faced this question calmly and said, "So, you won't have a regret when you have become mine." 

"So cheeky!" 

Serafall directly pulled Masa's cheek, thinking that this guy had never changed and was as cheeky as ever. 

Did he think that she was an easy woman like others? 

No way! 

Yet, even so, she didn't mind humoring him since if Masa was really okay after he faced her, then—

'Well, it isn't like it's impossible...' 

Regardless, Serafall could tell that Masa had truly wished for her to be his. Yes, it was wrong, yet in the world of the supernatural, what he did was still manly and conscious as he asked her first instead of forcing himself on her. 

As a devil, she knew well how dirty and wrecked a devil, all the supernatural beings, and even a human could be. 

Yes, many of them were gentle and kind, yet many were also so shitty. 

In her time, there were hardly any devils that could catch her eyes, and those strong ones were all boring, and those who were playful were so weak that they couldn't catch her interest. Moreover, her man could either be similar to or stronger than her. 

Unfortunately, when she met one, he couldn't be her only one, but fortunately, he was manly enough to court her despite having a fiancee. 

Still, when they arrived at the wasteland where the two would have their duel, Masa asked, "You sure about this, right?" 

"...what do you mean?" 

"Serafall."

"No, Onee-chan anymore? You really have gotten cheeky!" 

Masa ignored Serafall, who puffed her cheeks unhappily because of how rudely he called her despite their age difference and status as two, yet he didn't change his attitude and asked, "When you lose, you will become mine. That's what we have talked about before, right?"

"Um..." 

While Serafall had agreed, a blush emerged on her two smooth cheeks facing him, who straightforwardly asked her such a bold question. 

"Yet, even so, I won't force you, so if you don't agree to this duel, then you can leave since while I want you for myself, I will respect your feelings, and even if we part, you are precious to me, so I won't do something that will hurt you." 

"Baka!" 

His words were answered only by her outburst, which stunned him. 

"If I don't agree, then why do I follow you?! Be a man and take responsibility for me if you win!" 

"....." 

Masa stared at Serafall, who was smaller than him yet could match his gusts. "You are right. I apologize, so if I win, I will impregnate you right after the duel." 

Serafall was in a daze for a while before her face turned bright red, scorching hot. "You...! Did you understand what you were talking about?! I am the same age as your aunt!" 

"From the beginning of our meeting, I wanted you, but I understood the difference between us, so I know my place. However, it is different now. I might not have had power before, so I could only suppress this feeling, but not anymore, so quickly attack me with everything and be mine." 

In the world of the supernatural, it was stupid to hold back, especially when no rules could bind them. 

More importantly, a man had to be direct with his wish since, unlike him, Serafall didn't have a mind-reading ability. 

'Well, it isn't like I use this ability.' 

The advanced level of observation Haki gained from Patrick Redfield allowed him to read the minds of others, but Masa hardly used it. At least, in this situation, he decided to respect Serafall's wish. 

Masa had expressed his feelings, and Serafall didn't leave; instead, she followed him, ready to face him with all of her might, which meant that if he lost, he might be crippled or even lose his life, but if she lost, then she would give him everything. 

'Well, if I die, at least I will live on in her mind forever.' 

Well, he couldn't die, but he decided to keep quiet about this. 

The two had made up their minds, and this was what they wished for. 

Truthfully, they knew each other's feelings, and if Masa just pushed her here and there, Serafall would accept him, but without this exchange, their awkwardness would be impossible to erase, and her pride also wouldn't allow her to give him her everything, so—

"I will be serious." 

Serafall's Demonic Power burst out from her petite body, showcasing the almighty power that matched her status as a Leviathan. At the same time, her surroundings had become frozen with ice, showing her innate ability, "Ice."

Yes, unlike her little sister and the majority of her family, who came from the Sitri family, Serafall's innate ability mutated. Her power wasn't the water manipulation that was mastered by the devils born from the House of Sitri, but ice manipulation, a mutated ability of the House of Sitri. 

Supported by her immense Demonic Power, Serafall was the strongest female devil in this world! 

Yet, even so, Masa was all calm, folding his hands, but—

"...aren't you going to transform?"

Serafall had seen how Masa had transformed into a lion-like figure to defeat the user of the Boosted Gear that had gone on a rampage. He was so wild and handsome in that shape, so she wanted to see it, and at the same time, did he think that he could face her when he wasn't serious? 

"It's fine." 

"What do you mean?!" 

"It means that I will show you that I am not the wrong man for you." 

"Don't get ahead of yourselves, Masa! You were just a little cub a few years ago! I still have your photo of you with a small body but a huge willy!" 

"...can you start now?" 

"Okay! Okay! I will get serious! Don't regret it!" Serafall was annoyed by Masa's stubbornness, but—

"Don't die, okay?" 

Her voice might have been quiet, but even so, Masa heard it clearly, yet at the same time, Serafall used everything she had.

"Celsius Cross Trigger." 

As her voice fell, the world became frozen, and nothing could escape; from kilometers of radius, everything had become a freezing wonderland, and Masa, who received that attack without protection and accepted her everything, was completely buried and frozen by the ice. 

Only, Serafall realized what she had done, and watching herself, all alone, without anyone by her side, thinking that Masa had passed away, made her into in a panic, but when she was about to scream—

Crack!

The ice that buried him cracked, and his figure emerged from the ice, with many parts of his body still frozen by ice, yet it didn't stop his steps or spirit, which showed the victor between their duel.

As his figure appeared before her eyes, everything except for him was insignificant, and he was the only one in her eyes. 

As Masa walked toward her, Serafall's heart was beating so fast then, as expected, she was kissed, but unlike his previous gentle kiss, this kiss was so lewd, dirty, and overbearing, as if he wanted to mark her as his. 

His body, which was cold, slowly regained its heat and turned scorching as their kiss continued until he parted away when Serafall lost her breath, then said, "You are mine now." 

"Um~!" 

Facing the charming woman, who appeared to be drunk by the joyful exchange as drool leaked slightly from her pink, fleshy lips, Masa no longer hesitated, and on that single exchange, she was impregnated. 

---

In the distance, many had been waiting for a few days, hoping that everything was okay. Unfortunately, everything was so cold that those with a weak body couldn't even approach the frozen wonderland created by Serafall, but fortunately, Masa's followers, including Asia, told everyone that Masa was okay. 

Yet, even so, all of them were worried, and they had stayed in the nearby area for a while anxiously. 

Even Ravel had come, waiting for Masa, who appeared to be trapped in the frozen area. 

Those days continued until they saw a tall figure that they were familiar with. 

"Masa!" 

"Are you okay?" 

"What's happening?" 

Everyone quickly came to him, ignoring the cold around them, especially after Ravel created a fire to warm all of them up. Yet, it was impossible to hide their shock when they saw Masa holding a petite woman in his arms, who acted like a spoiled cat as he walked toward their direction. 

Still, Masa's answer was simple. 

"Nothing happens." 

"Then, why did you seduce Serafall-nee?!" 

"....." 

Regardless, everyone sighed in relief when they knew that Masa was okay, but one woman appeared to be gloomy when she noticed Serafall, who made a sign of victory in her direction.