First make sure both your partners are up to the task before hand. There is nothing worse than ruining the mood halfway through with a surprise such as this.
Have female A get on top of female B (or vice versa, order doesn't matter), on their knees. Their lower halves should be lined up. From behind, make sure you have the timing and rhythm right. It is best if you can swap between one and the other, while hard, without skipping a beat.
I'll upload pictures and easy step by step instructions once I have the time. PM me if you have any trouble.
The most difficult part of the swap is equal distribution.
I know... I know

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