After My Fiancé Cheated, I Became His Sister-in-law

【Tsundere and abstinent President + Sweet and charming beauty elder sister】Yun Qian was just engaged when she was cuckolded.It doesn't matter, she will retaliate.Since Song Zhijing could sleep with another woman on the night of the engagement, she could also sleep with another man.This time, she slept with Song Zhijing's cousin, with the small goal of becoming his sister-in-law.It's just that this man... doesn't seem easy to deal with.Mo Xiuyan met a woman.This woman, who was engaged to his cousin, knocked on his door on the night of the engagement. Since she came to him, he happily cooperated.“You said start, when it ends is up to me.”In this absurd adult game, who is the winner?