Last night, the innocent Sienna asked if Lycia was his girlfriend or not. While he and Shirley were busy arguing about how he insisted on staying at Lycia's place last night, Sienna remained silent, but it seemed the girl was a silent observer as she finally voiced her curiosity when no one else spoke in the car.
Of course, the girl needed a lot of courage before she could finally ask what was related to Davel's personal affairs, and even after letting the question out of her mouth, Sienna seemed a little regretful about her decision to come clean in front of someone that she didn't know very well.
What if Davel didn't like how she tried to meddle in his personal affairs? What if Davel ended up getting offended by her question? That worry was probably what scared Sienna last night, and that was why the girl looked nervous as she waited for Davel's answer.