The Flex is subject to the same substitution rules as everyone else she can only re-enter the game one time. BUT, and here is where the cheese gets binding, she has to have left the game to re-enter! There are several papers on Flex/DP, Steve has written a great expalnation of it, but the quick version and how I think of it is at the start of the game the Flex is a defensive player, the DP is an offensive player. So as long as the Flex always plays defense she/he has not left the game. Now the DP is an offensive player (for the issue of leaving the game, you can play the DP on defense for anyone but the flex without any sub reported) so as long as the DP bats and runs then they have not left the game. So in your scenerio the Flex can run for the DP(DP left game), DP can bat (DP re-enters, flex still has done nothing) Flex can then run (DP left game, that player is now on done for rest of game), Flex can then bat..... you can keep this up all day long for the DP position. BUT you have burnt your starting DP's one reentry and that player is done for the day, you can use a legal sub to put into the DP position and continue batting with the FLEX running, but the original player that started as DP is done once she re-enters once and then leaves the game again.
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