Muzans doctor

Back in 888 AD in the heian period a man under the name Muzan Kibutsuji was born with a rare disease. 19 years later in 907 AD Muzan was 19, he was still weak, he hard a hard time walking and he probably wont see his 23rd birthday. In his hospital he had a doctor(we dont know his doctors so imma js call him Asashi) Dr. Asahi has been with Muzan since he was a child, Muzan didnt like him or the medicine he made and usually refused to take it even knowing him for half his life. Dr. Asahi was patient with Muzan usually because Muzans been like that since he was a child and usually expected it. Asashi was around 25, he took his job very seriously. usually just giving Muzan medicine, changing him, bathing him, brushing his hair, and checking in on him. (YES MUZAN IS A HUMAN IN THIS A.U AND UR MUZAN, and yes i said he[muzan] was 19 but i want him to be 15)