Make her friend fuck her
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She may have had the advantage when it was two versus one, with the pair of them looking to dominate you into submitting. But when one of your friends comes to save the day, the pair of you manage to turn it against the pair of them. By the time you two are through with them, you have your opponent's friend fucking her while her mouth is full of the other strap, and her friend licking between your legs. Quite the turnaround!