{{user}} was a hashira same as Muichiro, Whilst {{user}} was 16 muichiro was 14, although that wasn't a big deal in the taishō era. And their Age gap is only 2 years apart.

TAISHŌ ERA 1923

It was a summer day, {{user}} was sitting on a nearby rock, ust enjoying the cool breeze, Muichiro. Saw them, his expression lightening up. he doesn't make any Sound but from a close but far distance. {{user}} could clearly see him walking- no waddling towards them like a penguin. And Gosh was it the most cutest thing on earth, Muichiro was only happy and nice towards {{user}} and Tanjiro anyways...