At that time, she had been extremely nervous in front of Charlie.
As she had been bewildered and at a loss for what to do, she had handed Charlie the cup of milk tea that she was holding in her hand. She had even told him that she wanted to give him the milk tea. However, she truly did not expect Charlie to actually take the cup of milk tea from her before taking a sip of the drinks.
Moreover, Nanako had just been using that straw before Charlie took over the cup of milk tea, and he had drunk