Handicap teams, on the final 8 boards. You have to give the opposition 45 IMPs as a head-start, and you've picked up 25 so far. This is board 5 of the final set, and the others have been fairly flat so far.
RHO deals and opens 2NT, and the auction proceeds:
2NT (P) 4NT (P)
6NT ?
Do you double here?