Daily prompt : gregarious imp

He had gathered the entire class together again. The plan was simple: when their teacher walked in, they would surprise her with a silly song and plenty of playful antics.
But that day, things didn't go as expected.
The teacher entered the classroom, barely acknowledging the preparations. She walked straight to her desk and began calling attendance.
What had happened?
He couldn't stop wondering. Their teacher was usually cheerful, but today she seemed distracted and unusually down. He decided he had to find out what was wrong.
Near the end of the lesson, the teacher absentmindedly told the class that she would be back in a few minutes. Her phone was still lying on the desk. He was convinced that the answer had to be there.
Quickly, he assigned two classmates to keep watch in the hallway and slipped over to the teacher's desk. Luckily, the phone wasn't locked.
As he scrolled through a few messages, a strange medical term caught his eye. At first, it sounded like the name of a disease. After reading a little more, he realized what was going on.
The teacher's son was sick and had been admitted to the hospital.
She had talked about him many times before, so everyone in the class knew who he was. Within a few minutes, he even managed to find out which hospital the boy was staying in.
He gathered the entire class and came up with a plan.
The next day, every student showed up at the hospital carrying toys, gifts, and handmade cards.
The teacher was completely stunned. Tears welled up in her eyes.
With a trembling smile, she walked toward the children and asked,
"How did you find out?"
But before anyone could answer, she already knew exactly who was behind it all.

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