creating two posts on a single page

I#ve copied and pasted this reply in another thread, but I’m wondering if this is actually possible as it varies from the OP’s request:

This is something that I’ve wanted to do myself. Particuarly for reviews – in a similar vain to comments, it would be interesting to see if there is a way to create a second block below the origibal post with the title second opinion written by a second author. Some sort of checkbox option where in the original post writing you could select Second opinion and it opens a second writing box in which a second user adds their user name from which it takes as the second author and the box is of a different colour sitting beneath the origibal post.

It’s possible, all of it is, how it works is another question, and how it’s done is another. If can do it with a website, I believe it can be done with WP it’s a just a question of how really.

One day I might be smart enough to do something like this, though I doubt it ??

To give an example:

Author A makes the post
Author B makes the second post.

All subsequent posts related to the same title would be placed beneath the original post.

Does that make sense?