So I just read the entire 'twincest archives'...
...and I just figured I'd put my 2 cents in here, instead of making you guys go through the entire thread again.
My view: Yes, Cole and Dylan are closer than normal siblings, (hell they're closer than normal twins) but that doesn't necessarily mean they have a romantic thing going on.
Keep in mind they once spent nine months wrapped around each other in constant contact, and began to associate close contact with safety and security. On a subconscious level, all the touching each other is their way of saying "Hey, it's all right, I'm here"
But it's still only platonic, brotherly love
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Where we're going, you don't need eyes to see