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More than one person thought this was a UFO, but you're right that it's a moonlit lake. Either way is fine - I used this picture just to see what came of it. Your story is beautifully dark.

I can see how the picture could be both :)
(Though I'm secretly glad that I'm right and in typical fashion, can't wait to inform him that it's not aliens, not this time at least.)

Thank you for your comment!