Marble started to stammer a refusal, then stopped, and steeled herself as she decided that she was going to do exactly what Limestone told her to do, purely to spite her bossy, bullying sister. Pinkie might be a motor mouth that spoke over her, and for her, ninety nine percent of the time, and totally destroyed her social skills, leaving her with only 'mmhmm' to cover the other one percent, but at least Pinkie was nice for all one hundred percent of the time she spoke over Marble, whereas Limestone, not so much.