See you after two days.

I discovered EnglishForward.com this morning and have learned already something. So I'll try another one.

Come after two days. vs Come in two days. 

For me 'after' would be used for a future event relative to another future event between now and the time he/she has to come. 

But never if it's relative to now.

Is there a nice rule written (printed) somewhere? Used Google, but nothing.