Domain landing pages

I am looking for a method to have a domain IE domain2.com land on a page say domain1.com/eggs so that the url remains as domain2.com and serves the domain1.com/eggs content until any other link is clicked when the browsing will continue as domain1.com content. I’ve searched high and low, even configured the multi site in an attempt to get this to work to no avail. Anyone with any ideas? Please help.

Cheers
Josh