Miranda, and Sarah means to settle something once and for all.

"Miranda!" Sarah gets a satisfied smile on her face. "Excellent. I know just what to do. Since you seem to think you're as sexy and freaky as me all of a sudden..." Miranda puts on such an innocent look that her nose should grow 5 feet by how much of an act it is, "I dare you to race me."
"Race you?" Miranda looks confused. "What does that mean?"
"It means we each pick a guy. I'm going to pick Matt, since he's probably already revved up. And whoever makes them cum first wins. You can only use your hands and your words. Dirty talk and jerking cock."
"And what are the stakes?" Miranda seems completely on board with the dare itself, she's just concerned about the stakes.
"Winner gets a trump card over the loser. One time only she can swap places with the loser, like in the middle of a dare. So she can make the loser take her place if she doesn't want to do it, or take her place in one if she likes what's happening. Or, she can just end a dare that the loser is involved with, or just include herself alongside the loser."
"Interesting. Well, since you picked Matt...."