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<iframe src="http://yourhost.com/yourstory.html" width="640" height="480" marginwidth="0" marginheight="0" frameborder="no" scrolling="yes"> </iframe>
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I don't have a tumblr account but this article seems to explain how to add an iFrame element to a tumblr page.
Your iFrame element would look something like the following:
You will need to change yourhost.com and yourstory.html to whatever your host website is and whatever you named your story HTML file. You will also need to change the iFrame's width and height properties to whatever size you want.
This is my test story.