You, You Little Poisonous Brat

Yun Xiwei feels that ever since she brought Yan Yiliang home, the little white bundle's development has been getting stranger and stranger. Yun Xiwei lay helplessly in bed, complaining, "When will this poison finally wear off? I've been bedridden for days." Yan Yiliang fed her porridge, lowering his eyes as he murmured, "This is rather nice, actually." Yun Xiwei grumbled, "What's so nice about it?" Yan Yiliang said offhandedly, "You can't escape, so naturally it's good." Yun Xiwei: "..." Did she mess up his upbringing somehow? The sickly, aloof little junior brother Yan Yiliang, whom she took in, x the protective, warm-hearted senior sister Yun Xiwei. More or less childhood friends, with the female lead older than the male lead. Trying my hand at writing a possessive male lead. Digging the pit first, then filling it in. I'll finish it all, promise =3=~