Spurred on by his desire to become stronger, Kairos continued to eat the black orbs one after another rather greedily. Although his hunger was not sated by them, he could no longer even tell that he was hungry at this point.
The feeling of all the foreign black blood rampaging about in his body nearly made his mind feel numb. Though his body was rapidly transforming the blood into actual flesh and parts of his body.
However, even when he found himself forcing down his 25th black orb, he wasn't able to promote his Abyss form into the D-tier. Although he imagined that a large amount would be needed to do such a thing, he also felt like not much was changing.
After taking a short break to calm down, he just decided to continue on as he had been. There was a latent urge to throw up, though no matter how much he ate, it never became a real one.
Once he felt most of the effects settle down and shift in his body, he continued his black orb buffet.