The lovely potpotkettle who has been producing a Japanese translation of this story has just informed me that a Japanese artist has made a piece of fan art for it.
Artist username 'rousaro' on twitter. Here is the short link to the artwork:
Please take a look, it is adorable and I am very excited and grateful.
List of translations available (and the heroes who made them):
French – Dan534 - u/6717163/
Korean - choeunmee - ml?book_code=1263297
Czech - mcepl - s/13145948/
Russian – Quadratic function - "ficbook . net"
Japanese – potpotkettle - u/9948199/
Thank you very much to everyone who has taken the time to translate this story and everyone who has taken the time to read it.