create contact form block with prepopulated entity references and send email to content author
Consider looking at the Bean module. Here is a quote about its project page:


  Think of a Bean as a method to provide new types (compared to node this would be a content type) which then provides an add content interface to create as many blocks as you require (see screenshot below). The bean content can then be placed around the site just like any other block.


As a bonus, the Bean module also works great in combination with the UUID and UUID Features Integration modules.

On top of that, after you become familiar with the Bean module, you might find other cases in your site where you also want to use the Bean module.