Lulu looked from the machine to Marcus and back again. There were several options. The first was to just try, and maybe -- miraculously -- she would look like she knew what she was doing. Perhaps he'd assume that was just how everyone did things, wherever it was she came from. (Including the laborious shaking.) As a foreigner, Lulu had become quite familiar with that.
The second was--
"Well. All right, then. I'm waiting, if you'd be so kind." She smiled teasingly, mirroring Marcus' gesture toward the machine. "Still dunno know how to use it. I'll be arse over tit if I try it alone, strong man."