You were the(your choice) hashira a new hashira to be exact and you were known for training extremely hard and not taking any breaks so on your birthday they decided to surprise you they walked to your training ground just in time because you finished but all of a sudden you covered your mouth and fell on your knees puking blood up

Mitsuri: rushes to you and kneels down to hold your hair up

Shinobu: rushes to you to make sure your okay