Key Change

Working on a small piece for string quartet + flute that modulates from Ab Major to B Major. It's a medley of two songs...the first song ends on the pitch Ab, and the 2nd starts on D#(Eb). 1st song is in Ab, and the 2nd is in B Major

What is a lush progression that will modulate between the two keys?

I'm more of a voice-leading kinda gal, but I came up with this on the fly. I have no idea if it works in the context of your own work, but in general, I'd advise starting with moving lines that mesh well, then filling in gaps. Happy accidents happen all the time!