Unless I'm missing anything, there is absolutely zero evidence whatsoever that it was with an older man. If this 15 year old goes to Boston to hook up at a bus stop, it's not unreasonable to think that other 15 year olds would do the same.

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“For me, it is far better to grasp the Universe as it really is than to persist in delusion, however satisfying and reassuring.” - Carl Sagan