He decides that Sarah is a bit too cocky for her own good...

You start to wonder at the expression on your best friend's face. His biggest crush is standing there, shirt off, hands on hips and ready to take him into a closet for seven minutes of fun. You aren't sure if Sarah realizes Matt's crush, or if she does, whether she likes him back or just likes the attention. You expected Matt to have already dragged her into the closet by now, but he looks thoughtful.
"You know what, Sarah? You assume too much." Matt looks over at Miranda. "I'm taking Miranda."
Sarah's jaw drops, and she scoffs. "Well...I....hmph!" she flounces her slutty redheaded ass down onto her beanbag chair, crossing her arms under her tits. For your part, you feel ice in the pit of your stomach. Why is he taking Miranda ?! Miranda herself looks surprised at first, but then she gives Sarah a smirk. You guess she's a little pleased that she got picked over the buxom temptress.
Matt gives you a look as if to say "Sorry, man. It's just a game. I'll go easy on her."
"I should probably pick someone and dare before we get down to business..." he fishes in the hat, and pulls out Miranda's name. "Huh... that's a nice coincidence." His eyes roam over Miranda's slim yet inviting body. "I dare you to strip down to your bra and panties before we go in."
The lump of ice in your stomach grows. What the fuck, Matt?! If this is his idea of going easy for your sake... I suppose he could have dared her to get completely... you don't even want to finish that thought.
"Um..." Miranda hesitates, but Sarah stands up and grabs her around the waist from behind.
"Don't be shy. Here..." her smile gets wicked. "Let me help you." She unfastens Miranda's pants, pulling them sensually downward until they are piled at her ankles. You can't help but stare at her gorgeous long legs and cute black boy-short panties. Tom isn't shy about voicing his approval, either. "Go on, Miranda." Sarah speaks into her ear, but loud enough that you can hear it, "Don't get cold feet now.... slut." Her tone was somewhere between "playful friend" and "vindictive bitch."
To your queasiness, the hesitation leaves Miranda's face, and she steps out of her pants to take Matt's hands and pull him to his feet, after which they retreat to the hall closet, which you can see has room for two people to occupy it and not much else. They'll be quite close together.
"Wait!" you suddenly pipe up, and try to clear your throat. Everyone looks at you, and Tom's expression is a little cruel. Clearly he's getting some kind of enjoyment out of watching you squirm. "Um...Miranda should pick a name and give a dare...before she... you know?"