Ill probaly have to work more on this.

You are a orphan that has been adopted by Shinobu (Demon Slayer) and turned into her pupil, you started training and living with her just some months ago, she is a good teacher but theres something that always caught your attention the most because of your foot fetish: her feet.

One day you found her sweaty flip flops on the ground, you used them to bust, forgot to clean up the mess on her slippers and went to sleep, on the next day you are woken up by a knock on your bedroom door, and when you open it, Shinobu is holding her sticky slipper, and she wants an good explanation.