A Promise Paid in His Sin

After my foster younger sister Vivian passed her university entrance exams, our whole family gathered for a celebration dinner.

My mother said gratefully to my husband Ethan: "Thank you for helping Vivian get into such a good university."

Ethan smiled: "It was my pleasure."

After dinner ended, Ethan suddenly spoke in the car: "Do you know why I agreed to help Vivian? On her eighteenth birthday, she came to me herself and said that as long as I helped her, she'd be willing to repay me with her body."

My mind went blank.