After becoming the white moonlight of my archenemy

I traveled back to my archenemy’s childhood. To disgust my archenemy, I claimed to be his future wife and became his ‘white moonlight.’ Before leaving, I patted his head and lied, ‘Big brother is going to buy some milk tea and will be back soon, okay?’ That sentence made him wait for ten years. Later, my archenemy turned into someone crazier than me, a yandere. He locked me on the bed and smirked coldly, ‘Wife, trying to run away again? I guess the milk tea you wanted was the extra creamy one.’