Nanotex is a form of latex creating using nanotechnology and magic.
The word nanotex is a portmanteau of the words nanotechnology and latex.
Have nanotex be computational fibre of sorts. The more it works, the warmer it gets. It needs to dissipate heat somehow... thus, boob heatsinks.
Since Nano is made of it, she could overheat if she overclocks herself. This could lead to throttling, which could lead to bimbo Nano for a short amount of time while she cools down.