If asked Romilda would have admitted that the look was in relation to the flavor and had nothing to do with Cho's abilities as a barista. She'd actually been meaning to come in again since her walk with Draco a few weeks back.
Romilda looked at the cup with a sigh. "If you could transfigure it into something a little larger that would be wonderful." Romilda could always use a warming charm if the substance got cold, but creating more that would have the decent flavoring of the shop was not something she was confident she could find success with.