Nacchi should market her "special milk", she'll make a serious bundle. 
You mean like this?

Official product, sold at her first concert tour...
On IRC when we talked about Natsumilk, I think some new people got disgusted like "you're a bunch of pervs!" and left... But it really was an
official product
I saw a 2006 version too, but it seems like I didn't save a pic of that...

It was pretty plain, anyway.