It was rather awkward having Ron that close while Harry was standing there and anyone within her department could see. Hermione tried to play along, still trying to act exasperated at being destroyed, though she did laugh slightly when Ron made her wave her hand at Harry so they could get going.
"So are you," she said to Ron. However, once Harry's back was turned, she threw Ron a quick look. When he pressed a kiss to the back of her hand, she withdrew it quickly the moment he let go of it, as if burned, and looked around to make sure no one had seen that. "Stop. Not here," she mouthed and shook her head. They couldn't do things like that here, surely he understood? If they were caught and suspected, there could be a lot of hell to pay under the new Ministry law.
Stepping into the lift, Hermione adjusted the bag on her shoulder and shrugged her shoulders at Harry, smiling again. "You two decide since it's your brilliant plan, after all."