Where's the 'I wish this thread didn't exist' choice?
It's virtually impossible for it to happen at this point. It's theoretically possible in the Rose Bowl if Oregon makes the Title Game, but they'd never invite two Ohio teams to the Rose Bowl. The Orange Bowl will have the ACC Champ, unless Ga Tech makes the Title game, which is almost impossible. The Sugar will take the Florida-Bama loser, and then gets the last choice as thie opponent, so they'll likely have TCU or Boise State as the opponent.
The Fiesta is the interesting one. If Texas wins out, they get a replacement pick for them. And although the replacement may not be another Big 12 team, it's again very unlikely that they'd take two teams from Ohio.