For our twins an epidural was placed and a low dose administered just to ensure that it would function if/when needed. It was then left in place but not used from that point on. It was put in place for the exact reasons as stated. OB was happy to deliver both naturally providing the first was head down, the second could have been breach and that was okay. They were only concerned about twin A's position to begin the labour and then twin B would be dealt with during.