Jon smiled back, most of the awkwardness having faded. "I'm going to get out of here before someone in your family senses and/or smells me. I don't know what they'd do, but I probably wouldn't like it."
He started to fly away, then turned back at the last second. "Wait a second." He patted his pockets and found a scrap of paper. Further examination turned up nothing else. "Hm." Jon carefully used his heat vision to just barely leave a mark on the paper, then grinned and continued. He handed over the result to Sophie. "There's my number. Huh. My writing's kind of girly." He shook his head. "Anyway. See you later." With that, and blushing a bit, Jon flew away.