The effects on Kyo was slowly starting to grow more painful, the slightest twitching in his muscles will have given away his growing weakness which showed that. However, unlike his brother; Kyo could still move normally. Even with the amount of willpower Bōfū had, his body had already taken much more than it should have been capable of handling. Especially considering the fact his boosted physical attributes due to the multiplier he had just used destroyed his body. Either way, Kyo knew the fight had already reached its conclusion and just to add salt to the wound, Kyo put his hands into his pockets as if saying there's no reason to continue the battle as it's climax had already been decided.
Kyo: You idiot, look at yourself. You're loosing blood your body is beaten. You're only standing for 2 reasons.. One of those reasons is simply because i'm not actually using punches or kicks, im slapping you. The second reason, you just dont know when you're out matched. Let me show you what happens when I actually use my real power. *sighs* I'm ending this now.
Upon saying those words, his face became more serious as his brother was only going to kill himself in the long run. With the power he's been using, Bōfū already couldn't keep up, now Kyo added his chakra into effect and further empowered his abilities to their absolute max. As such, the instant he kicked off the off the ground directly after he finished his words. Debris from the very spot he just been exploded into a cloud of smoke and closing the distance between them seeminly instantaneous as if his jump back for distance meant absolutely nothing. Delivering an upwards kick straight to Bōfū's chin, forcing his teeth to slam to slam into one another and shatter on impact as he flew up into the air, this kick will also be so strong that it will have left the youngest sibling completely stunned and temporarily paralyzed from the impact. Then, as he advances forward; His body begins to rotate on the ball of his supporting foot, generating angular momentum as his body and his brothers rocket into the air. The rotation gradually intensifies with each rotation, causing Kyo's body to become a human cyclone. At the apex of the rotation, just before the full force of the spin is unleashed, his lead leg extends with electrifying speed and precision. His chakra-infused foot becomes a veritable battering ram, striking his opponent with concussive force. The Cyclone Kick channels the accumulated kinetic energy and chakra into this single, focused strike, creating a shockwave of power that reverberates through the target's body upon impact before crashing down onto Bōfū.
This was Kyo's Cyclone Kick, which by the end of it will have left his younger brothers body completely broken. The bones in his legs and arms being broken to prevent him from further attempting to go against his brother's power, his jaw and nose broken, even his ribs being shattered, on top some of his organs being ruptured. After all was said and done, Kyo will have finally deactivated the demon face technique now that the effects from it had reached a point his body could no longer handle as he fell down to one knee, at first it was clear signs of struggling pain on his face as most of his muscles tensed up, but he was able to grab 2 tablets from his pocket which were placed in a black case within his shinobi pouch, popping one tablet in time before the full effect hit him and actively feeding the other one to Bōfū as he wouldn't be able to feed it to himself.
Kyo: You're done, now take one of these. This session is over.