Start by Eating Jake Jake no Mi

"Yami Yami no Mi..." 

Strangely enough, Masa could feel that the Devil Fruit that was eaten by Teach seemed happy when he devoured it along with Teach's body. 

Still, more importantly—

"I can eat more Devil Fruit!" 

After he devoured Teach, his body gained the special traits of Teach's lineage, which allowed him to eat two Devil Fruits in one body.

Naturally, due to his special ability, the total of Devil Fruits that he could eat was eight! 

"Three more, then it will be completed." 

Jake Jake no Mi, Pika Pika no Mi, Ton Ton no Mi, Neko Neko no Mi, Model: Nemean Lion, and lastly, Yami Yami no Mi. 

Those were the five Devil Fruits that he had eaten, and he could eat three more as his limit was eight Devil Fruits. 

Still, aside from allowing him to eat more Devil Fruits, Teach's body also had many unique powers, and this was also the reason why Teach could become the Pirate Emperor. 

However—

"Teach isn't that powerful." 

Yes, Teach might be able to hurt Shanks, or rather, the one who gave Shanks a triple set of parallel, linear scars, but Masa had to say that Teach wasn't strong if he compared him to Big Bom, Kaido, and even Whitebeard. 

If there was a reason why Teach could hurt Shanks, it was because Shanks wasn't that strong either. 

Yes, Shanks might be one of the Pirate Emperors, but even so, his strength wasn't in defense or physical ability like Kaidou and Big Mom. Instead, his strength came from his mastery over Haki and also the powerful comrades under him.

As for the swordsmanship? 

While it was powerful, his strength wasn't so exaggerated that Shanks could conquer this world. 

If Shanks could conquer the world, then it was all due to the power of his family. 

As for Shanks' defense, the fact that he was hurt by Teach, who didn't even have the Supreme King Haki, was the answer itself, right? 

Still, if Teach, who was often told as the last villain of this story, what would happen to this world then? 

Well, it didn't matter, Masa thought, since even Kizaru also died, so why couldn't Teach die, too? 

More importantly, it was hard for him to believe in Teach, especially with how treacherous and dirty Teach was. 

Unlike most of the straightforward and honest people in this world, who would fight directly without being afraid of the challenge before them, Teach was lying, crying, begging, and showing desperate and also cowardly actions without any problems, but when he showed a chance, he would give a deadly strike that led into death of his target. 

Yes, Teach was dirty, but if he was the winner, then so what? 

It was also because Masa felt that it was better to kill Teach directly since even if, in the beginning, he didn't have much of an interest in the Yami Yami no Mi and was only interested in Teach's special lineage, he felt that it was better to devour Teach. 

Masa didn't fear Teach, but the benefits that he gained from devouring Teach were far better than he imagined, and it cost a lot of money to copy Teach's DNA into his body, especially when there was an extreme lack of facilities on this island, especially after Wapol was quite stingy with medical research and hardly gave the doctors any money. 

Still, as he had devoured Teach, then, there was no need to hesitate. 

Masa took out one of the Devil Fruits that he had collected after he came to this island. 

"Baku Baku no Mi."

He opened his lips and ate this Devil Fruit, which completed this devouring ability. 

Everything within his body was digested and fused into his body smoothly, without any problems. 

Unlike the awkward Jake Jake no Mi's devour, which was to make all of those devoured into his jacket, the Baku Baku no Mi truly combined all of those he had devoured into his body, giving him the traits all that he had eaten. 

"Hmm..." 

Unexpectedly, the Baku Baku no Mi was more interesting than he had thought before. 

First of all, his first goal in devouring the Baku Baku no Mi was to gain the ability concept of eating, which allowed him to fill his belly and gain energy with any resources in this universe, such as hydrogen, the most abundant substance in the universe. 

Frankly, if Masa wished to, it should be possible, but he hadn't honed and just ate this Devil Fruit, so instead of just hydrogen, he ate the air and everything that mixed with that substance, whether it was oxygen, carbon dioxide, or anything else. 

Yet, while he felt a little awkward, he also realized that he could even use the harmful substances on this earth so the earth could be purified and cleaned. 

"This Devil Fruit is too powerful, right?" 

If Masa wished to, he felt that he could even eat radiation to fill his belly and clean up the environment, especially those areas that had their lands, air, and water area desolated and contaminated by harmful substances, without being harmed and completely digested them, turning them into his energy. 

If he had to say, the ability of this Devil Fruit was like throwing two birds with one stone! 

It was so useful and powerful! 

More importantly, he could impose this ability on the ability of Yami Yami no Mi, which made him able to devour anything that was eaten by the black hole or darkness created by this Devil Fruit. 

Somehow, a unique idea formed within his mind after he ate two Yami Yami no Mi and Baku Baku no Mi, especially to help the plan that Masa of Mahouka wished to do to change the world of Mahouka and change the status quo of the magicians. 

Still, as he gained those two Devil Fruits, he knew that he had to develop them well since he knew their potential could be even greater in the future. 

At the same time, he looked at the four people under Teach. 

Jesus Burgess, Van Augur, Lafitte, and Doc Q with his horse, Strength. 

Those four were Teach's four original followers who started to follow Teach from the beginning, but as Teach had died, should he kill them? 

"If I am not wrong, Yami Yami no Mi can absorb a Devil Fruit, so it will reincarnate nearby, right? 

Masa looked at the four for a moment and threw them into the seawater to see whether some of them would react, but as they were still passed out, he couldn't see much of a reaction from them.

"Hm... let's keep them for a while." 

Masa still needed subordinates, and they were good enough, he thought, so he ordered his cats to keep all of them inside the prison, then went to Dalton, who passed out after being beaten by Teach. 

If he had to be honest, he didn't really like Dalton much, especially when this guy was too realistic and just helped people if he saw a benefit from it. 

If Vivi was just a normal woman, would Dalton even help? 

Yet, even so, there wasn't much of a hatred between them, but Dalton was too naive, thinking that he could escape and take Masa's possessions, thinking that he wouldn't be punished due to his special status as a Devil Fruit user. 

So, the darkness grew from his palm, then swallowed Dalton, and then, soon, a Devil Fruit appeared in his palm. 

"Ushi Ushi no Mi, Model: Bison." 

If Masa wished to, he might be able to evolve it into a bovine-type Mythical Creature, such as the Behemoth from the world of DxD, but—

"Let's rest first." 

Stretching his arms high, Masa had to say he felt a bit lethargic after a long battle.