Matt, and Miranda comes up with a twist.

"Matt." Miranda's face looks cuter than ever as she thinks of something for your best friend to do. With the amount of exposed female skin in the room, it's hard to keep your own boner contained. You divide your time pretty evenly between openly staring at Sarah, who seem content for every eye in the room to enjoy her bounty, and getting as much of any eyeful of Miranda as you can without seeming too ****. Nicole seems to be getting more and more used to her state of undress, and you find yourself admiring what she has to offer as well.
"Ok, I've got an interesting one for you, Matt. How about you close your eyes. Us girls will take turns giving you a kiss, and you have to correctly identify who was who." she looks at the other two girls. Sarah is clearly down for it, and Nicole nods in agreement after a brief hesitation.
"Lame..." Tom grumbles.
"What happens if I can't?" Matt says, seeming confident.
"You lose your shirt and your shorts, both." Miranda smiles wickedly, and Sarah cackles with delight.
"And if I win?"
"...hmmm."
"How about seven minutes in heaven with the girl of your choice?" Sarah pipes up. Matt's face goes red. You think it's obvious who he would choose, and his eyes look like their about to fall into Sarah's cleavage.
"Hey... don't you want to see if we're okay with that first?" Nicole pipes up.
"Relax. It's not like he's going to pick you, honey..." Sarah gives Nicole a venomous look. You expect Nicole to be relieved, but she actually looks hurt.
"I accept the dare. Does anyone have a blindfold?" Matt leans back, content to make out with three beautiful girls and not too concerned about losing his clothes if he can't identify them.
Sarah finds a bandanna and ties it around Matt's eyes. Then the girls gather together in the center of the room.
"Now, keep your hands to yourself. No trying to figure out who it is by groping." Miranda admonishes, practically bouncing on her toes. Does she have a thing for Matt? you wonder. Or maybe she's just having fun.
Sarah nods, and Miranda nudges Nicole forward first. Nicole kneels in front of Matt, and sits awkwardly on his lap to press her lips against his. She's awkward at first, just using her lips, but soon snakes her tongue inside Matt's mouth. You note, with some surprise, that she's also grinding against Matt's crotch, and tangling her fingers in his hair. You realize that maybe she's trying to emulate the way that Sarah might kiss someone, in order to throw him off.
After about 20 seconds, Nicole finishes, silently retreating to other two girls. Miranda and Sarah are both grinning, and you note that Tom is playing with his phone, clearly checked out.
Miranda goes next, and does practically the same thing that Nicole had done, only with much more experience behind it. She has no trouble running her hands up and down Matt's chest, moaning softly into his mouth as they kiss, and she's practically dry humping by the end of the kiss. She finishes up with a red face and a smile, and you aren't sure if your more jealous of Sarah or just turned on.
After the first two performances, you expect Sarah to kiss the sluttiest of all, but she surprises you by acting very demure and even sensual, kissing Matt's neck and cheeks and giving him soft pecks before gently making out. She keeps her body practically off of his, with only their mouths connecting beyond putting her hands on his shoulders. You realize, of course, that she's doing the opposite of what the other girls did, pretending to be Nicole, probably.
When she completes the kissing and returns to the center with the other girls, Matt takes off the blindfold. He makes no effort to hide the tent in his pants.
"Well that was great. Give yourselves a round of applause, ladies." He smirks.
"Alright, sir!" Miranda puts hands on hips. "Who was who?"