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He was in love, to say the least. His heart was a mess and his thoughts were worse, Zenitsu loved Nezuko like he never thought he could love someone; Nezuko was beautiful and her sweet manner was what reminded him how much life was worth living. Even after the battle and the girl returning to her humanity, Zenitsu's feelings did not diminish one bit.
So, Zenitsu finds himself longing to hold the hand of his love, without fear and without worries for his future.
One day, when the confession of his heart in a desperate cry stunned the poor Kamado girl and she could not walk back to her home, it was Zenitsu who had to help her with that. He was thinking about Tanjiro and how possibly furious he would be to see how his stupidity affected his little sister's eardrums, oh God, he would kill him without mercy.
And that's when he feels it, softness against the roughness of his hand, warmth and strength, they were long fingers against his, entangling delicately. Nezuko held his hand firmly as they walked slowly down the path.
He almost died obviously, but, just as the deafened beauty at his side could make him lose his breath with such a simple gesture, it could give him the energy to fight every demon in the world with such a significant act.
Zenitsu was delighted, fascinated and in love, so, without thinking further, he enjoyed holding the hand of the most beautiful woman he had ever seen with a silly smile.
Of course, the enjoyment didn't last long when Tanjiro looked at him at the entrance of the house with a surprising repulsion.
Damn party pooper.