How could we say "May Allah prolong your love" to a new couple?

Regards,
Scott 

You could say this idiom for newly married couple: "Allah bir yastikta kocatsin"

Thank you Seyit, but I´d appreciate if you could translate my previous sentence literally.

My attempts as learner:

Allah aşkınızı uzun sürdürsün. - May Allah make your love last long.

Allah aşkınızı uzatsın. - Literally (at least in my opinion ) : Let Allah prolong your love.

But please remember that these are only learner´s attempts - I recommend for you to wait for advanced learner or Turkish native speaker, so they may say if these translations sound natural at all.

Allah aşkınızı daim etsin.