@LiiQUiiD odds should be something similar like this (Royal into straight = I think that nearly the same case):
The probability for you to get 98 suited, the opponent to get AK suited and the flop to come down to give both of you straight flushes is (4/1326)(1/1225)(1/17296) = 1 / 7 023 689 400 or 7023689399 to 1 against.
EDIT: sorry, did not see you were 3 with FLUSHes in hand already ... so odds really 1000x smaller!!!
It´s easy to miss the realy unusual in my info. text. So to make it more clear...
there is 3 players. That on the flopp (7k 5k 6k) gets this hands.
Player 1 = (Kk Ak) Ace high flush
Player 2 = (4k 3k) Straight flush
Player 3 = (8k 9k) Straight flush (me wins
Funny, to me wow factor is the two straight flushes not the ace high flush that comes with it although it is some extra fot that hand surely. But someone with better math skills can calculate what is difference between that high flush being there versus not. I doubt there is that much difference If it were 4 of kind or smthg in addition to straight flushes then it would be another story