She was sitting at her desk, lost in thought. It was quite late at night, and she still had some reading she wanted to get done. She had a tendency to chew at the corner of her lip and finger while staring into deep space. Her desk was facing the window, looking onto the neighbouring house. The balcony lights suddenly turned on, which startled her out of her reverie. Three people walked onto the balcony, stretching and taking in the night air. Candles were lit, adding to the bright glow of the balcony. Good idea, it was cold outside... Her thoughts drifted along with her eyes, settling on the face of a young man, who was staring right at her! Her attention was focused for a second too long to look away. She gave a tentative smile and wave, bringing a wide grin to the man's rosy face. He was wearing a cap, but she could see some of his curly golden hair underneath. She thought he looked at ease and very happy where he was. After a few minutes goofily smiling at each other, he waved and went back to his phone, so she pulled out her book and started reading. In a few moments, the balcony lights went out, and everything outside her window became black again.
Alternatively:
She was reclined at her desk on the third floor, thinking. It was 1 am, and she still had some reading that she wanted to do. She had a tendency to chew at her index finger while staring into deep space. Her desk was facing the window, looking onto the neighbouring house. The balcony lights flipped on, startling her out of her reverie. Three people emerged onto the balcony, stretching in the night air and talking. Candles glowed crisply across the dark 4-meter distance, which made the floating balcony appear inviting and warm. It looks chilly out tonight... Her thoughts drifted with her eyes, settling on the face of a young man, who was staring right at her! Her attention was focused for a second too long to look away. She gave a tentative smile and wave, bringing a bright grin to the man's face that revealed some dimples. After a minute of grinning at each other, he waved and hunched back over his phone, so she opened her book and started reading. After a few moments, the lights flickered out, rendering the balcony instantly dark again. Illuminated by the light in her own room, she continued to read into the night.