Billy pursed his lips together for a moment, his head cocking to the side at Bart's first statement. Oh... entirely different than what I was thinking. Okay. It didn't take long before he was smiling again though. This situation was easy. Well, easy enough. Much easier than dealing with someone who was all mopey because they might not be liked or wanted.
"Kids... do stuff..." Billy offered unhelpfully with a shrug. "They play games and basketball and talk about girls and sneak out of their houses. They try to get into parties and hang out with friends and do stupid stuff." He was mentally running through ever teen coming-of-age movie he had seen as he spoke.
"Mostly though, just do what you enjoy doing. Though it doesn't hurt to try new things from time to time."