THIS IS ADORABLE! I like the idea of Kane-san looking like a little boy during his time with Hijikata (after all, when Hijikata died, technically Kane-san was two years old, even if swords are objects and thus don't age xD). I wanted to ask if I can share the pixiv version on my tumblr? I will give you all the credit and I will not remove any link that leads to the original work. Thanks for this beautiful art!
Also, wouldn't you mind if I make a couple of drawings inspired by your concept? I will also credit you for the original idea!