After gaining the Batto Batto no Mi, Model: Vampire, Shinra was more relaxed, and he also wasn't in a hurry to do the next thing, as he had gotten what he wanted. Instead, he had leisurely days in the Land of Promises, which was the location of the Trans Town, where the appointment with the CP0 would happen.
During those times, he also learned the abilities of this Devil Fruit further, whether it was the life-force absorption, blood manipulation, etc, and more importantly, the possibility of turning others into vampires, and also gaining the abilities of others from their blood.
Robin had eaten the Devil Fruit, but she had no special ability like him. As she was a native of this world, it was impossible for her to eat more Devil Fruit unless her body received special surgery, turning her body special, like a certain villain in this world, but she was pregnant and was about to become a mother, so whether she or him didn't want to do a dangerous activity to her body.
On the other hand, Carina didn't really want to eat the Devil Fruit as she still wanted to swim freely and enter the water.
Yet, the two of them knew that they were weak, and if they could become stronger, at least, they could protect themselves, or run away when the danger came, it would be nice, so the two of them supported him to develop his vampirism ability, which made him able to turn others into his vampire subordinates.
Despite being his subordinates, they would gain the power of vampires, and unlike the Devil Fruits, they had no need to be afraid of water, but naturally, as they had gained this power from him, whether it was their death or life was within his decision, or their lives were as good as his.
However, as they gained the special power, wouldn't it be normal for them to pay a certain price?
The power of the Devil Fruit was amazing, but they would be cursed by the ocean as they would become weak and powerless as they were exposed to the water.
Meanwhile, by becoming his subordinates, they could gain the power of vampires, which increased their overall physical abilities, recovery, regeneration, and, depending on how close their relationship was, he could even give them extra abilities such as blood manipulation, life force absorptions, or the abilities within his arsenal such as the abilities of Kaiju, martial arts, or any Devil Fruits that he had usurped.
Still, even if it was impossible, Shinra didn't transform Carina or Robin into vampires as he still needed to further research this ability in a detailed manner, as he wanted to see their complete DNAs first.
More importantly, it wouldn't be too late to do all of that when Robin was pregnant, and as there was also a chance for Carina to get pregnant, he didn't want anything to happen to their children, since, as they became vampires due to his ability, what would happen to their children?
Instead of believing that nothing would happen without a single basis, it wouldn't be too late to do some research first about this ability.
Similarly, the ability to gain the abilities of others from the blood of others also needed to be tested further.
After all, unlike the Eye of Usurpation, which was easy to use and could select those that were useful and didn't take the demerits or weird traits from the one that he robbed, or the merging ability of the Kaiju No. 9 that was clear as he could choose with who he would merge with and gain everything, the ability of the blood was... how to say... it was still an ambiguous process and wasn't as easy as it seemed to be.
In his mind, he just needed to take away the blood of others; then he would become powerful, but the reality wasn't as easy as it seemed, especially in this world where many strange types of demi-human races existed.
If he didn't care what would happen to his children, took the blood of those strong people, and replicated their DNA to become stronger, he knew that when the mothers of his children gave birth, there was a chance that his children would become monsters.
Yes, this was just a possibility, and it might not happen to his children, but it might happen within his lines, especially those who inherited his DNA.
Whether it was merging or the blood ingestion ability, they were complicated, as he couldn't be choosy like how he used the Eye of Usurp, only taking the goods and leaving the demerits out.
Or rather, if possible, he wanted to develop the Eye of Usurp to the point where he could transfer all of the demerits within his body to others, which would give him a perfect, flawless, superior body that would definitely be inherited by his children.
With that said, he knew that it was better for him to return to the world of Naruto, develop his Mangekyou Sharingan to the Eternal Mangekyou Sharingan, so that he could use the Eye of Usurp and Eye of Beyond without worries.
The two abilities of his Mangekyou Sharingan were simple, but they had limited times to be used. Yet, even so, they had limitless potential, but once again, as they couldn't be used many times forcefully and needed a certain amount of time to be used once again, or else, he would be blind, he couldn't utilize those two abilities to the fullest, especially when it could be used on the future of his family if in the case they might have disabilities or they had defects.
The regenerative ability of the Kaiju and vampire might help him to recover his eyes, but this wasn't a perfect solution for his problem, so should he go back to the world of Naruto?
Of course, but could he fight against his enemies?
If it were before, Shinra might not have had confidence, but now, especially after he had gained all the abilities from the world of Kengan, Kaiju No. 8, and even One Piece, of course, he had a certain confidence.
Yet, to make sure that everything was okay, he decided to develop his ability further, especially his ability in Haki, as this ability was magical.
The use of Haki might seem crude, since, unlike the development of chakra, which can reach the realm of soul, space, and even metaphysics, something that cannot be understood by technology, Haki was primarily used for physical fights.
Still, it might be simple, yet it was all good, he thought.
At the same time, he also thought of going back to Mikoto Uchiha, Souryuin Shion, and Kure Karura, as he had left them for a while, especially when they were about to give birth.
If Shinra somehow wasn't by their side when they gave birth, even if he felt that they might accept it and didn't mind, as they knew their goal was, but as a man, he knew what he should do and shouldn't do.
Only when he was about to have meetings with the CP0, someone wanted to cause him trouble.
"You! Yes, you over there! How dare you take away all of my attention!"
"....." 3x
Standing in front of them was an effeminate man with long blonde hair, riding on the top of a white horse, as he stared at Shinra with a dangerous gaze before he said viciously, "I won't forgive anyone who is more beautiful than me!"
"...what?"
Meanwhile, two people with white suits and unique masks saw the conflict that was about to start in the Trans Town.
"Is he the one?"
"Handsome and also has two lovers, it should be him. Should we help him?"
One among the two, seemingly a woman with large breasts, asked her partner.
"No, let's see his power first, whether he is worthy of the position or not."
As the two stayed hidden, many eyes were on them, curious to see the conflict that would unfold before them.
"Oh-ho?"