EF with Azure - Mixing SQL Server and Windows Azure Storage

I want to use two different data sources in my Azure project:

• a SQL Server that contains basic partial info regarding an item (allows indexable data and spatial search)
• a Windows Azure Storage that contains full remaining info regarding an item (retrieved by key)

In this way I can combine the powerful of SQL Server with the easy scalability of Windows Azure Storage.

Imagine this Domain POCO class:

class Person
{
   string Id { get; set; }
   string Name { get; set; }
   byte[] Picture { get; set; }
   string Biography { get; set; }
}

I would like to use Entity Framework with fluent mapping to let EF understand that the properties Picture and Biography must be loaded from Windows Azure Storage (table, blob) instead of SQL Server (possibly Lazy loaded).

There's a way with EF (or NHibernate) to do this or I have to implement my own ORM strategy?

Thanks