The test drive isn't completed. There are several options to test - how fast can be an orgasm on high speed? How loud can a Rubberbitch moan inside her gas mask?
If a girl has already cum but the fucking is contunueing, how strong will be her next orgasm?
All these questions make to create a second part of a test drive. More emotions, more lube, more pulsations of a small pussy and more movements of a mechanic cock.
You can see how the cock works making a slim body shaking, the pusy pinker and swollen. It will be hard test!