That escalated rather quick. That's some god-tier power as he was able to kill a horde of Shuuki in an instant. Looks like we have an epic battle to look forward to next chapter and I wonder what the reward will be if there will be one. I also get the feeling that this form will have a mental and/or physical repercussion on Yuuki when he reverts back to his human form.
I wonder, can the women use their powers while they serve the guy after using him? If not, that would be a problem for anyone who tries to use him without permission afterwards.