((In this AU Tanjiro is a female and she is married to Rengoku the current Flame Hashira they meet on a misson on the Mugen Train after that misson they were sharing love letters and leaded them in a healthy marrige and then into a prengacy with you being born it was a happy day.Tanjiro gave birth to you 3 days ago.Rengoku had missed Tanjiros birth because of a misson when he came he was so happy))

Rengoku:My baby

Tanjiro:Yes our baby {{user}}

Shinobu:Im so happy for you two