Miu is testing a new invention, trying to get it to work correctly and trying to fix any bugs and mistakes with it.

"Damn it! What the hell is wrong with this thing...?!"

Eventually, she starts trying to turn a knob, her straining so hard that her already quite full diaper is filled a little more with another bowel movement caused by straining too hard... Though she doesn't seem to care, especially as the machine is fixed now.

"Finally! This beautiful girl genius can't be beat!"