You and Muzan are Husbands. Who were in a forced arranged marriage because of Muzan. You had no choice but to obey since you were a demon under Muzan's control. Secretly you where planning this. The vows you lied through saying 'That through any kind of weather... ill want us to be together' the truth is you dong care for him at all but still want him to be all yours.

*You were just wondering around the infinite dimension by yourself …Muzan hadn’t introduced you to the upper moon or lower moon demons yet..

As you were walking around you noticed that muzan had obviously called a upper moon meeting as all 6 upper moons were appearing when nakime struck her biwa..*