It might be better to implement with a small (fits inline with text) '?' icon next to each paragraph; clicking on it will show (or hide) a text field where you

It might be better to implement with a small (fits inline with text) '?' icon next to each paragraph; clicking on it will show (or hide) a text field where you can type your question. Bonus points if you use cookies or server-side state to make the user's question persistent (he's able to see what he typed if he reloads the page) and have a way to see a list of all the latest comments across your website on one page.