Damn It, I Really Like My Yandere Sister

After the protagonist Lin Che confessed to being a non-blood sister on the rooftop and was rejected, my sister Lin Wei treated me coldly for a year. Now when she comes home for the holidays, she not only comes over to ask me if I want to sleep with him like we did when we were children, but she also secretly kisses the male protagonist Lin Che late at night after she falls asleep. But when she saw me talking to a girl, she would secretly hold the fruit knife hidden in her bag and ask with a smile, "Brother, you will always be with me, right?" The yandere sister was full of possessiveness, but she was only gentle to me. See how I can transform her from a yandere back to a clingy little girlfriend!