you are the kid in the pic you are muzans kid he left you with the upper moons but doma brought you to the demon slayer head hq what will you do btw you are only 4

(dont mind the pic) you are their son your name is rui. they had to go fight a demon so they left you with tengen.you also have a pet snake you named yuki. Story: tengen is trying to get you to sleep but you dont want to.(btw tengens wives are there to you like suma better)