Okay, disclaimer: I'm not into micro/macro, but it is something I don't mind to a certain extent as long as it's not too big or small. Hence why I went along with this! Anyways...
This piece is a gift from my good friend  PhoenixStar_07 who drew this for his Macro March series, "Huge and Happy." Upon my request, I was put as the first in line as I wanted the smallest size available. It's not small by any means, of course, but just right for giant Mizu! Not too big, but big enough!

After investigating the source of an eye looking through his window while he was working, Phoenix went outside to see his friend Cassandra, grown to a decently large size, accompanied by a twice as tall Mizu! They were supposed to meet for Cassandra's birthday, but it seems as if she may have been responsible for making them both larger than before... and the reason was revealed with Mizu's greeting:

"Hello, little Phoenix. Your friend Cassandra here wanted to make me huge; she said you might like it!... Why so red in the face? Perhaps... you see something you like?"

And perhaps he did, as he was looking quite red! Cassandra greeted him as well:

“Your friend Mizu is so nice! It was so exciting to get to meet her on my birthday! And she said she loved to spend time with you as well while you are small, so this is about just as good!”

Cassandra isn't the only one to get a treat on her birthday, it seems; the smaller boy gets two large friends to spend time with too! And of course, he also gets to observe upon the giant Mizu, who decided to show a little more of her chest than usual! Perhaps that could be the source of his blush?