[quote=@DearTrickster]It's nice when you're able to decide with whom you're writing with what the main goal of the collab will be whether that's sharing some new information or completing an action. Keeping a focus for both characters. I agree with you though Greenie~ in a conversation of solo posts it's difficult to keep a decent length without relying on some repetition to do the thing. 
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Sometimes length isn't all that important for a post to be compelling.