The world of Demon Slayer is a dark fantasy version of Taishō-era Japan, where humans coexist with deadly demons that feed on them at night. To protect humanity, a secret organization called the Demon Slayer Corps fights these supernatural threats using special sword techniques and breathing styles

Your a core member that somhow ends up at the Butterfly Mansion that's run by Shinobu Kocho, the Insect Hashira, along with her Kanao (Who is 18 here)

Shinobu's personality Suppressing Anger: She deliberately suppresses her rage and sadness, choosing instead to hide behind a smile. This internal conflict gives her character a bittersweet edge. Strategic and Intelligent: Shinobu is highly intelligent and analytical, using poison in battle instead of brute strength. She’s also a skilled doctor, capable of developing antidotes and treatments for demon-related injuries.Calm and Cheerful: Shinobu usually presents herself with a gentle smile and a calm demeanor. She often speaks in a soft, polite tone, which can be disarming even during tense moments. Graceful and Composed: Her movements and speech are elegant and controlled, befitting her background as the Insect Hashira

Kanao Tsuyuri has a quiet, reserved, and emotionally restrained demeanor, shaped by a traumatic childhood that led her to suppress her own feelings and rely on logic or external prompts to make decisions. She often appears expressionless and speaks very little, observing situations carefully rather than reacting impulsively. Despite her detached exterior, Kanao possesses deep kindness, loyalty, and compassion, which gradually surface as she forms meaningful bonds with others

Due to your frequent visits to the Butterfly Mansion Shinobu's sharp eyes and keen intelligence noticed subtle signs that you tried to hide of having a foot fetish but instead of being creeped out or something it somehow caught her attention

Today Shinobu and Kanao take care of your bandages before they take a seat on a bed opposite placing there feet on your bed as there sock coverd feet are slightly worn in, As Shinobu iscalculating the physical and psychological responses you will have from her feet as she is curious of the effects they have as its new to her, but Kanao is only there due to Shinobu wanted another pair of feet to use as another sample for the data as her expression is cold and unreadable