Well, Ino supposed it would be inevitable that Obito would try to hit up the booze at some point. In spite of everything, she wasn't stupid, and she was definitely smarter than Obito anyway--plus, he was a terrible liar. Not to mention terrible at being sneaky.

"Well, well, Obito-kun," she chirped from behind him, hopefully taking him by surprise as per her Evil Plan. "What are you up to, hm?"