Zenitsu and (Y/n) are put in a mission together at (mountain name) to destroy a different kind of demon.
"Your gonna protect me right (Y/n)-chan?" Zenitsu cried
"Z-zenitsu-kun, you have to stand on your own if you want the girls to marry you" (Y/n) said at him
"B-but (Y/n)-chan!"
"Come on we're already here" (Y/n) said and they walked in, (Y/n) then used her Byakugan and looked around to find the demon.
"Ara~ what do we have here?~" they turned to the owner of the voice and saw a lady with a horn and wings sitting at the tree branch
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"Who are you?" (Y/n) asked in seriousness ready to take out her sword out same with Zenitsu who is still shaking but still in high alert
"Hm~ oh! How rude of me~ I'm Nicca~" she introduced at them and jumped down from the tree branch.
"Now, why don't you entertain me~" the demon smirked and dashed towards (Y/n), the demon was about to claw her but Zenitsu immediately snatched (Y/n)
"W-wait! We are not tasty food, okay! So please don't eat us!!!!" Zenitsu yelled while being chased around.
"Just stay still dammit!!" The demon said while chasing and clawing Zenitsu who continued to bodge.
While the demon is being distracted, (Y/n) made one clone and switch with it, so the clone is now in Zenitsu's arms while the real (Y/n) silently unsheathed her sword and dashed towards the demon girl.
"Flame breathing; first form: Unknowing fire"
(Y/n) then slashed the demon girl's neck from behind and the demon girl's head rolled to the ground while (Y/n) clone disappeared in a puff of smoke which startled Zenitsu but then calmed down when he saw (Y/n) unharmed, when they were about to walk away they heard the demon girl speak.
"How unfair, I didn't have much fun! Oh well, I guess I will have to give you a goodbye gift" After she finished her sentence she released a dark purple smoke and she then turned into dust.
When (Y/n) and Zenitsu inhaled the smoke they suddenly feel sleepy and they then collapsed onto the ground.
(Next morning)
"Ahhhh!!!!!!" (Y/n) woke up because of the screaming but the voice seems familiar, she then stood up and saw her yellow hair fall at her eyes 'wait- yellow hair!?!?!'
"Who!? Who are you!? Why are you look like me!?!?" (Y/n) immediately turn around and her eyes widened at what she saw 'why does that girl looks like me!?!?! Wait a minute, that's it! It's because of that smoke that we inhaled from the demon! So that means...'
"Z-zenitsu-kun?" (Y/n) asked
"(Y/n)-chan?" Zenitsu also asked "ehhh!?!?!? So that means you're in my body and I'm in your body!!" He said and (Y/n) nodded
