Nebula watched Rose with the coffee, head cocked to the side in curiosity. Once she'd finished altering her cup, Nebula experimented slowly, pouring in some milk and some sugar, testing the taste, then adding more. She didn't think coffee was very good, even if it could be saved with many spoons of the sugar. Out of a sense of manners, she held onto the cup and sipped small sips. Rose was being kind and Nebula felt she might be wise to return the gesture. "This is fine," she said. It wasn't like she wasn't entirely used to tolerating things she didn't care for.
"I am familiar with human fragility," Nebula said, not intending any offense. "I... do not like small spaces, but I can tolerate it." Nebula had been worse; it was something Nebula reminded herself often. If she could survive Thanos, she could survive anything, even forced captivity. "Perhaps..." she considered, "I could spar with my sister and we could spend some time in my ship." That would put her at ease.