She was about to repeat her terrifying signature move. I yelled in fear: "Shut up! Are you going to say there’s someone outside?" 

Her fingers froze in mid-air, her eyes filled with confusion and anxiety. Then she raised her hand, shook her head, and pointed out the window: "Sister, there’s someone outside." 

This time, when she said this, she emphasized the word "sister." 

It turned out that when I asked her just now, it was precisely the word "sister" that was missing. After she finished speaking, she put her index finger back into her mouth and slowly walked towards the door. 

I suddenly became very curious about what she would do every time she said this to me. 

So I quietly followed her. I saw her slowly return to her bedroom, clumsily climb onto the windowsill, open the window, and slowly climb out. Then she carefully climbed along the edge of the balcony to my window. 

So... that's it... 

I sneered. 

Sister! I'm not arguing with you anymore, why are you still doing this, repeating the same conspiracy for three years? Are you trying to drive your sister crazy or scare her to death by doing this? - 7] 

Ever since I learned of my sister's plot, I've felt more at ease. 

Whenever my sister appeared behind me again, I'd suddenly turn around and say, "Sister, there's someone outside." 

Every time, my sister would freeze in shock and confusion, her eyes filled with an unknown sense of helplessness and fear. She'd open her mouth, then close it again. Then, she'd slowly totter out the door, back to her bedroom, then climb up the balcony to my windowsill, then back again. 

Night after night, she'd repeat this tirelessly. 

Later, I was busy with exams, but also tired of playing this tedious game with a fool. So, I changed my strategy. 

I knew she was right behind me, I heard her say, "Sister, there's someone outside." I saw her frail figure swaying outside the window and then slowly crawling back, but I still turned a blind eye and ignored her. She'd made me invisible to my parents, so I wanted her to be invisible to me, too. 

Even so, my sister persisted in doing the same thing. 

Every day, she would appear at the appointed time, say those six words to me, and then climb out my window. 

However, her face grew paler and her expression more sorrowful. 

I could have easily told my parents about her behavior and asked them to stop her—after all, climbing out the window is dangerous. But I didn't. 

For some reason, I didn't want to. Deep down, I secretly hoped that my sister would actually fall and die. Then, my parents would be devastated, and then their grief would gradually subside. Then, realizing they had another wonderful daughter, they would cherish and dote on her even more. 

I admit, my thoughts were a bit filthy, but I was fed up with this fool! - 8] 

One day, my mother said worriedly, "My sister has changed." 

"Why?" 

My mother gave me a meaningful look. "Talk to my sister more often. Otherwise, she'll get lonely." 

I lowered my head, refusing to say a word. Mom and Dad always only considered my sister's feelings, never even a thought for me, not even a little bit. 

My mother saw my unhappy expression, came over, and gently stroked my hair: "I know you've been feeling guilty and haven't dared to face your sister, but we've all forgiven you, and your sister has forgiven you too."