The Protector Of The Butterflies (Male Reader X KNY)

Y/N was a guard tasked to protect Kanae Kocho and Shinobu Kocho. When Y/N was still a baby, Ms Kocho found him floating on a river. When he was found, the next 2 days Kanae was born, the next year Shinobu was born. For thirteen years the three of them always stick together, train together and so on. Until one day all the wisteria arihnd the butterfly estate are gone and Demons started attacking the place, Ms.Kocho sacrificed herself to protect the three of us, her last words are for me to protect them both. Until i left to become stronger to protect them..