How Did the Innocent Neighbor Girl Turn into a Yandere!

[Yandere➕Daily Life➕Sister Next Door➕Single Heroine] Xu Fei and Su Qing were born in a hospital and were about to graduate from high school. Due to some special reasons, they moved next door to his house. After an accident, the girl next door changed! Never experienced it before "Brother Xu Fei, what is this~" "There are strange noises in my house every night. What is that noise?" After experience "Brother Fei, can I continue to taste that time?" "I want that smell more often" "Brother Fei, I don't want to hurt you, then I can only hurt myself!"