The pair fight over it.

The pair set you down and Big Barda moves into position for you to fuck her doggy-style.
Wonder Woman objects, tipping her over like a cow, surprising the large woman.

"I saw him first, bitch," Barda says.
"Ha! I had him last week. I get him first," Wonder Woman replies.
"You owe me! I am the one that got us freed from those freaky Aliens who wanted to milk us to feed their young."
"That was a Secret Adventure, dammit! He wasn't supposed to know about that."
"Well, now he does. Come here stud- she owes me big time for getting us out of that."

"Whoa now- slow down," Wonder Woman interjects, putting a hand in your direction, "She owes me too."
"For what?"
"For what?!? I took that crazy, big toy that Mister Miracle bought to use on you. The one that you were afraid to."
"Oh...that. Well, you did take that...in the ass," Barda says, adding the extra touch to embarrass her teammate.
"You bitch- why did you tell him that?"

"You know you want this ass," Barda says, shaking it invitingly, "It is still nice and tight."
"Amazonian Healing Technology has made mine just as tight as it ever was...and you know that.
You should try it on your pussy!"
"Bitch!"

You don't want them to fight.
You know that they have to cum to break free of the powder's effects.
Time to end this...and start something else.

"Ladies, please. In my mind, you're both even. I'm happy to fuck both of you. Can't we all just get along and enjoy this?"
"...he's right," WW says.
"...yeah, I agree," Barda says.

The pair share a quick hug and turn to face you as a pair.

"You decide then," they say in unison.
Oh boy.