From Lunarpages Web Hosting Wiki
Can I host multiple domains on my Lunarpages account?
Yes, we have an Add-on domain feature which makes it possible for you to have additional websites (with email) on just one account.
The Basic and Business plans comes with unlimited free add-on domains, which can be set up if you have purchased the new domain name through Lunarpages or an external company.
The Windows plan comes with 1 free add-on domain. After your first free add-on domain on the Windows plan, an additional add-on domain can be purchased for $2.50 per month.
If you have a valid credit card on file, you can purchase additional addon domains online via CAP (Customer Account Page) at https://account.lunarpages.com.
Login with your Lunarpages username and password, then choose the Upgrades / Addons Menu, or you can email firstname.lastname@example.org to enable more.
Each domain will resolve to its own name and content like a separate website, though they share the resources of the account with the primary domain. Add-on domains can have their own email addresses and can use any database on the account.
Please note: Add-on domains cannot have parked domains which resolve to the primary domain content or sub-domains as add-ons actually are created as sub domains in our system. We can switch an add-on domain name with a primary domain name if you need these on an add-on domain name and not the primary domain. The add-on would become the primary and vice-versa. You will have to move the content around yourself.