The moment Haru used his Elemental Sight, he could see Kojou's entire body and found out that this guy was the main protagonist of this world.
How could he be so sure?
The first reason was the little sister. Haru wasn't sure why, but most authors loved to write the main character to have a little sister.
The second reason was that the fourth primogenitor was a girl, and she was the one who gave Kojou an ability, which very fit the description of the harem protagonist.
It might sound rude, but almost all the harem protagonist light novels were quite similar to each other, so it was quite easy to find it, especially when Haru saw Kojou's stupid expression.
Haru didn't care much about Kojou, but he was interested in the power inside Kojou's. He used his Elemental Sight, and based on the data that entered his head, he saw that Kojou's body was several times stronger than a normal human, Kojou's fangs were also a bit special and lastly, he could see unlimited life energy from Kojou.
It might be because as the fourth primogenitor, Kojou gained immortality, which gave him unlimited life energy.
Still, even if the fourth primogenitor had an unlimited amount of life energy, Kojou was weak. After all, this guy didn't have experience in fighting, and Kojou couldn't use the power of the fourth primogenitor very well. More importantly, Kojou couldn't control something that inhabited his body.
Haru took a deep breath and prepared to sneak peek into the things that inhabited Kojou's body.
"What's wrong?" Mimori asked worriedly when she saw Haru taking a deep breath and had a serious expression on his face.
"Wait a moment, let me prepare myself," Haru said then started to use his barrier magic, creating a barrier around the laboratory to protect the surrounding area, and no one would realize what was going to happen since he was sure that the things inside Kojou's body were very aggressive, and once he peeked them, they would become angry for sure, so he needed to do little preparation before he did it.
Unlike Mimori, who didn't notice that Haru was using the Elemental Sight, the things inside Kojou's body might realize his action and take offense to him. After all, the things inside Kojou's body were the real power of the fourth primogenitor. They had their own pride as the strongest.
Even though Haru was stronger than them, and he could also tame them, they didn't know that and thought that he was weaker than them, so he needed to scare them and tame them directly since soon, they would become part of his body.
"Mimori, stay behind me," Haru said with a serious tone.
Mimori was confused, but she followed his words.
Haru then, without hesitation, used his Elemental Sight on the things inside Kojou's body.
"ROOOOARRRR!!!!"
The moment the Elemental Sight was used on the things inside Kojou's body, all of them became furious directly, the abundance of energy exploded from Kojou's body, and it shook the entire space.
Luckily, Haru had made a barrier around the laboratory, so they didn't need to worry that someone might notice them.
"Kojou!"
Mimori was dumbfounded when she saw her son had gone berserk, and she could see all the energy that was released from her son's body was so powerful that it could break anything in the surrounding area, and she knew if she didn't stand behind Haru, then she might die directly because of the pressure. "Haru!" She held his back, and her voice was so desperate since she didn't want her son to be in pain.
"You don't need to worry."
His voice was like magic that it calmed Mimori directly, but then she saw something so amazing.
"Shut up!"
Haru then, without hesitation, used his "Haoshoku Haki"!
*BOOOOOOOOOOOM!*
The moment Haru used his "Haoshoku Haki," it caused the space to tremble, and it almost twisted.
The things inside Kojou's body, the 12 Vassal Beasts inside, roared in pain when Haru used his "Haoshoku Haki" directly.
Haru then used his Aquaman ability. Even though in the story, Aquaman might only seem to be able to control marine life, that wasn't the truth. Aquaman could control anything with telepathic ability. It could be said that Aquaman was the one with the strongest mind control ability.
With both "Haoshoku Haki" and "Aquaman's telepathic ability," all the Vassal Beasts inside Kojou's body started to calm down, and it was being subdued by Haru forcefully.
Looking at everyone that started to calm down, Mimori was dumbfounded and looked at Haru with amazement, wondering who he was, but one thing for sure, she knew that she could believe in him.
"Mimori, you know, there's only one way for me to return your son to the human back," Haru said.
"What?" Mimori asked.
"That I need to absorb his power," Haru said.
"You can absorb the power of the fourth primogenitor?" Mimori was dumbfounded.
"I can do it." Haru nodded but said, "But I'll become a vampire in exchange for him."
"Ah." Mimori opened her mouth and wasn't sure what to say. If she nodded, then that meant Haru would become a vampire in exchange for her son, and she couldn't do it. She knew that Haru was a human, and even though she didn't know how he could gain such powerful power, she knew that she couldn't let him become a vampire.
Her expression was very difficult at this moment, and she wasn't sure what to say for a moment.
Haru knew that the moment that he stole the power inside Kojou's, there would be a lot of trouble that would come to Mimori, Kojou, and Nagisa since the disappearance of the fourth primogenitor's power was something that had never happened before, and it was something that would cause a lot of power, organization, party, and everyone to become scared.
Haru knew how cheating his "Snatch" ability was since it could simply steal anything. He then caressed Mimori's cheek and said, "Well, you don't need to worry, don't show such an expression. After all, this guy will be my stepson."
"What the fuck did you say in this situation?!" Mimori was almost mad, but she was also blushing. She then shook her head and said, "I'm too old. You should go after Nagisa. She's young, beautiful, and cute." She knew that she could trust her daughter to Haru after what he had given to her.
Haru looked at Mimori for a moment with a smile and said, "Let's talk about this after I have returned your son back to humanity." He then, without hesitation, used "Snatch" on Kojou, then every power of the fourth primogenitor was stolen by him directly, and it entered his body. He could feel the abundance of life energy on him, and he could feel that he had become even stronger. He could also feel the existence of 12 Vassal Beasts which also entered his body without hesitation, but at the same time, he started to notice the change in his body.
The feminine and sweet smell from Mimori became intense, and it caused his eyes to turn red.
The process of the Snatch wasn't that long, and before long, Kojou was still laying there, with a pale expression, but when Haru used his light magic, Ripple, along with various treatment abilities that he owned, Kojou's complexion returned back to normal.
Haru let out a long sigh, and somehow he felt slightly tired, after all, compared to the scale of Elemental Sight, the ability of the fourth primogenitor was several times more powerful, but in truth, he wasn't tired because of the process of the "Snatch," but rather, he was tired to stop himself from holding Mimori, after all, his sexual drive was strong and being added the vampire's life force energy, his sexual drive became even stronger, and as for his urge to drink blood, he could also feel it, but it was fairly weak compared his urge to have sex.
Haru was thinking of using his "Sealing Magic" to seal his urge, but then he was hugged by Mimori.
"Let's move somewhere," Mimori whispered, and her hands moved toward the hard thing on his pants.
Haru didn't overthink, held Mimori's body without hesitation, and teleported to the villa inside his Ocean to calm himself. As for rejecting Mimiro's advance, there was no such thing in his dictionary, and for now, he wanted to enjoy the fruit of his hard work.