Do you pair any of the premades with each other?

MCCC usually does it for me. But when Maxis added the Sims from the rebranding to the Library, I pulled out Dela and Mia and put them together; I played them briefly to make them girlfriends (they already had a high romantic bar together) then marked them unplayed. With the high romantic bar MCCC won't pair them with anyone else. They're living in a San Myshuno apartment. :)