My Elder Sister Switched the Bridal Sedan, and I Laughed

On my wedding day, my elder half-sister schemed to switch our bridal sedans. I became a stepmother, while she climbed into bed with my gentle, refined husband, the top scholar. When we met again, she was heavily pregnant, while I was arguing bitterly with my stepson. Watching my half-sister smirk at her success, I smiled too. You thought you were shifting the trouble onto me, but how do you know someone wasn’t quietly helping things along?