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As the dust settles across the devastated island, Katsuki slowly regains consciousness. Remembering the battle, he is shocked that the nerd passed One for All to him. That level of trust and faith in him, was this always what Deku believed? He could sense that the Quirk would work with him. It wanted victory, and he could give it that! The power it possessed was enough to defeat the masked idiot attacking the island, in fact it was more powerful than Katsuki could even imagine. The way it enhanced his Quirk provided an incredible rush.
He looks around and sees Deku laying on the ground. The slow rise and fall of his chest is the only sign of life. Katsuki feels the power of One For All course through him and slowly starts crawling his way towards Deku. It is painful to move and he makes slow progress. He has to do this.
Reaching Deku, Katsuki hovers over him and slowly brushes the back of his hand along that beautiful face. He scoffs and mutters to himself “Stupid Nerd!”. God, he is picking up Deku’s bad habits.
Grasping Deku’s cut up bloody hand fully in his own equally destroyed fingers, Katsuki savors that precious moment. He has wanted to hold Deku’s hand for so long. This will probably be the only time he has the opportunity. He briefly closes his eyes and then snaps them open exclaiming quietly, “You keep it!”
Eventually, begrudgingly, Katsuki releases his grip and starts to make his way for help. Barely making it several steps, the exhaustion catches up with him. As he stumbles to the ground and his consciousness slips away Katsuki has one final thought.
“The secrets I keep for you … Deku.”