Thunder|| KNY x Agatsuma sister! reader

(Y/N) was Zenitsu Agastuma's twin sister. She was a bit more mature and had a temper, while zenitsu wailed and cried almost everytime. They both use the thunder breathing technique. I dont know what to put here in these descriptions anymore. T.T you both are like Toko and yoshiteru from Volume 23 of the manga. Also, there's spoilers.