"Sara?" Wait, his mom's really here? It sounds like he's not particularly alone with anyone other than someone he knows. If Sara's mom, then... well, that's relieving. It's good that a kid has his mom here. "You know what? I don't like staying in my room either. It gets kinda boring, huh? It's nice to stretch your legs."

He tilts his head to the side, frowning.

"... I'm guessing Sara doesn't know you're gone."