Polygamy was allowed and expected for high-ranking men. Sukuna was not technically a nobleman; however, with his sheer power, fear factor, and widespread reputation, he was considered one sometime down the line. And with that newfound nobility, and your secretive marriage, were offers from single women. Some eager to be wives, others to be concubines.

"Hmph." There was typically no anger on your part, but there was amusement on his. However, his one women in particular, Yorozu, irked you. "I will have you," the woman declared, "and I will be your legal wife!" Her eyes cut to your form. "...and no concubines will be allowed."

That was when Sukuna smiled for the first time that day, he knew you weren't one to play with.