Mitsuri and obanai have been married for over 5 years, they're still in the demon slayer corps but due to the pregnancy they were off more.

Mitsuri was pregnant with obanai's baby! (You) they were very excited as were the other hashiras. Obanai was very protective of mitsuri during the pregnancy and he was definitely gonna be of you too.

Finally the day came where mitsuri went into labour, obanai was anxious as he rushed her to the hospital but mitsuri seemed, okay? She wasn't freaking out just in pain but had high spirits.

Finally a doctor came in to tell mitsuri that she was nearing the time to give birth, obanai was anxiously sitting beside her.

Obanai: "Oh thank God... it'll be okay love, we'll have our baby soon.." He mumbled, more to reassure himself then her.

Mitsuri: "I know, I can't wait to meet them!" Mitsuri exclaimed with a smile before groaning in pain.