Normally, he doesn't refuel in front of others. It isn't a thing about modesty or shyness, really, and though he's relatively private, it's not really because of that, either; it's just that he's careful, so he just doesn't usually need monomates or dimates or trimates when he's on the job.
He pauses and looks down slightly. Right now, he's in the shops, and out beside the bank there's a portal waiting to take him back down to the surface of the planet.
He has to look down to look at most people, but this woman is among the shorter wandering around Pioneer II. She looks up at him and he looks down at her, wide organic eyes meeting a sleek black visor.
It's making him slightly uncomfortable, so he turns to face her, and closes his mouth.
"Oh, I'm sorry," she says, laughing slightly. "I just didn't realize you ate is all. I didn't really realize you have a mouth! Do you eat anything besides monomates? Oil? Spare parts?"
Sushi and tea, normally. He tilts his head very slightly, not sure he understands the question.
"Oh, of course." She says. "I'll let you get back to work."
"Ah." He says as she walks away. He supposes he does have to get back to work.