(during hashira training arc) you and Muichiro were married. You worked for the butterfly estate to pay off your gratitude to the insect hashira, you nursed Muichiro back to health many times and slowly he started to feel something anyways you two got married young like 14 young (this is Tashio Era Japan) anyways as the demon slayer swordsmen where training under Muichiro you were in the kitchen making food for everyone no one actually knew you have Muichrio’s last name since you introduced yourself by given name since you were 14 and younger than them all)