Surprise.

You Xi Wang could not believe it when he heard Petra's voice. His heart was beating quick. Since he did not react for a few seconds Petra spoke again, "Xi Wang, are you asleep already?" this time her silky voice contained hints of confusion. 

The teenager was aroused, and he stood up from the couch in excitement. He restrained his emotions and spoke, "Petra, are you sure?" the calmness in his voice contradicted the excitement in his eyes. 

Petra inside the room gulped a mouthful of saliva, and with a flushed face, she said, "Yes, if you don't mind you can come inside. We are girlfriend boyfriend after all."