Not an aspie trait. The boy wants attention, and is willing to make things up to get it. My NT kids do it a lot more often than my AS son.
This could be a serious problem. Then again he could have a good imagination and develop into a writer. My daughter nearly had the cops come over when she told someone about the abduction and rape of a classmate by the prinicpal. Never happened. She just decided to one up her cousins and did so in dramatic fashion. My drama queen. We had a long talk over this and have had no other major issues. But I will say her creative writing papers have some potential.
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Murphy was an optimist.