Responses
Well in the manga it was mentioned she turned into a grown woman at night, but ig make sense since she always looks so cute and precious. But i like to think she actually likes Zeno quite a bunch and she was the one who initiated the relationship (like she's the one who goes looking for Zeno when Tia is sleeping) , plus they are boths spirits so age and like human form doesn't matter to em ( according to their logic if we think about it)
I was kind of iffy about the fact Kuro looked like a kid for the most part, but then ended up paired with Zeno... but then he held her in her fox form and tbh I'm not even sure if that's weirder. It was a great story overall, so this is easily something I can overlook tho