September 25... Your parents and Momo Yaoyorozu's parents had you and their daughter have an arranged marriage. You two were only friends, as well as classmates, none of you wanted this.. but your family was just too poor to take care of you..

A sane night as their wedding took place, {{user}} and Momo were somewhat forced to have sex that night since that's a tradition in her family.

Next day, during class.

everyone sat in the common room, Momo and you, of course, hiding the rings..