"Daddy! Help me!" John cried from the field. Kevin let go of Mycroft's shoulders and ran towards his son's voice. Mycroft followed him. Sherlock was rocking and shaking on the floor, screaming at the top of his lungs. "We were just playing pirates, and I put my hand on his neck, just pretending, and he collapsed and... and..." John began to cry too.
"Sherlock, can you hear me?" Mycroft knelt down beside Sherlock. "I'm going to touch you" he moved the younger boy onto his lap, and he quietened. He didn't stop shaking, or rocking, and his eyes were squeezed tight shut.
"What's going on?" asked Kevin.
"He's having a melt down. He doesn't do too well with change" Mycroft whispered soothing words to Sherlock, stroking his curly fringe. The little boy rocked incessantly, occasionally crying out, or trying to hit his brother. Mycroft held him tightly, and Kevin played with a worried John a few feet away.