"Yeah, the green parts of plants are the leaves," Cassie said, biting back the urge to tell him more about plant leaves and how they worked. It wasn't helpful here, but there was just so much she took for granted that he apparently had no idea about. She'd learned about photosynthesis and plant life cycles in elementary school, he wasn't even 100-percent confident on what leaves even were.

Come to think of it, maybe right now wasn't the best time to be offering him caffeine.

"I usually go for cocoa or water, myself," she said. "Depending if I want something warm or cold."