My sister-in-law came to accompany my wife during her hospital stay. Usually kind and caring, I decided to playfully tease her in a sexual way. What started as a half-joke gradually turned serious as I became intrigued by her reactions. Despite both being married, our secret affair quickly escalated. Though she looks just like my wife, her body chemistry with me is completely different. The illicit sex between us gave rise to new, uncontrollable desires.