what did he say?!!!!!!Sex comment censored by ROWUK - Family site!!!!!!
As a comeback player myself I can't stress the importance of music. Long tones and lip slurs don't make music. They just make the chops more buff and muscular so to speak. It's best to take some simple jaunty tunes and integrate them into the embouchure development.
In the meantime find music to work with in your embouchure development studies. Back to the sex analogy...if you've been with three or four musical charts, you've been with multiple note partners that will help you get over the hump :)