How Did the Pitiful Little Villain I Redeemed Turn into a Yandere?

[Dark confinement] [Tsundere little angel vs. unhinged, pitiful little one] [Two female leads] [Rescue] [Psychological yandere] [Sweet romance] [Healing] [Redemption] After waking up, Xia Suluo finds herself in a book as the cruel older sister of a little villain with autism. To make amends, she decides to drop her old persona and take good care of the autistic child. After she protects the little villain from harm time and again, the pitiful look in the child’s eyes grows increasingly disturbing. “Big sister, do you know?” “Know what?” “If you tell me you love me now, maybe... I’ll really like you~” “Like me?” “Mm.” “Really?” “Really.” “Ah! That’s no reason to bite me!” “Hehe, it’s getting later and darker~” “Mmph.”