"Ours...."(Yandere! Matsus x reader)

All art in this book (except book cover) belongs to me so please don't claim it as your own, Thank you! This is a Horror book filled with murder, blood and gore. If you don't like that stuff, please do not read this. This book is about you, (Y/N), who have been friends with the Matsuno sextuplets ever since kindergart...