Why Can My Sister Do It but I Can't?

Yu Yao was blessed with a beautiful face, but unfortunately, she was a bona fide empty-headed beauty. With an exceptionally talented and capable older sister, she was constantly compared to her, and even their mother favored her sister more. Driven by jealousy, Yu Yao had been eager to snatch anything that belonged to her sister ever since childhood. After their mother passed away, Yu Yao no longer had a reason to compete for her affection, and life suddenly seemed dull. Then one day, her sister brought home a woman Yu Yao had never seen before, saying she was her future sister-in-law. Her sister-in-law was graceful and alluring, with a cool, refined air and a pair of limpid, tender eyes. As it happened, she was exactly Yu Yao's type. Yu Yao deliberately got close to her and tried every way to seduce her. To her surprise, it went remarkably smoothly... When the truth came out, Yu Yao faced the accusations without a trace of guilt. "If my sister can do it, why can't I?" Strangely, her sister wasn't angry. Instead, she looked at Yu Yao with pity. The marriage alliance between the Yu and Liu families drew everyone's attention, but one side changed brides at the last minute. Rumor had it that Second Miss Yu had stolen her sister's love. The outside world buzzed with gossip, but Yu Yao paid no attention, basking in the affection of her loving wife. Her wife was gentle and considerate in everyday life, alluring in bed, and married life was nothing short of blissful. But an accident cruelly shattered the illusion of happiness... It turned out that from beginning to end, Yu Yao had been the most thoroughly deceived fool of all, a pitiful bargaining chip. * When the truth finally came to light, Yu Yao fell apart. Every day, she cried and demanded a divorce. The words she said most often were, "I hate you." Her wife, who watched her every moment of the day and had once been gentle and beautiful, now looked hateful. She smiled softly, her fingertips tracing up Yu Yao's trembling back, inch by inch. Pathological possessiveness surged in her eyes as she murmured with deep affection, "But I love you." I love you so, so much. [Willful, spoiled, empty-headed beauty x gentle, masterful actress, unhinged wolf in sheep's clothing] *Younger sister x sister-in-law. No affairs while either relationship is ongoing; one-on-one, body and soul. Reading Guide: The character descriptions are the content warnings. The protagonists are both flawed. This is an indulgence fic, so please don't judge them morally. By reading, you are assumed to accept the characters as they are. Comments attacking the characters will be deleted. If anything makes you uncomfortable while reading, please don't force yourself to continue. Theme: Strive tirelessly to grow stronger.