Tom

"It's Tom." You reply emotionless to Nicole who asked.

She's the only one still showing a bit of livliness, probably because the game is quite matching her expectations.
You would have hoped to pull Miranda, so that you could at least have dared her to go take a blanket.
But then and idea comes to you mind.

"Tom, i dare you to take off you shirt and put it on Miranda."

Smugly you see the douche throw at you an annoyed look before shrugging and starting to unbutton his shirt.
Sarah won't be able to contest you anything with this wording, you're sure of it.
If you would have just said that Tom had to give his shirt to Miranda, that wouldn't have been enough to overwrite her penalty, but imposing him to actually put it on her should do the trick.

"Let me get this straight, dude, what's the big idea? You want to play the knight on a white steed?" He says this with clear mocking intent, while at the same time exposing his wiry torso, a combination that would easily get you mad, if you wouldn't feel so confident right now.

"No, i'm just trying to help a friend in need." You reply calmly reciveing a grateful faint smile from Miranda.

"If you say so..."

Idiot.

Slowly, he moves in front of your crush, blatantly happy of showing around his abs and gestures her to get up, which she clumsily does.
The unpleasant gut feeling that watching her, so awfully naked and so close to an also half naked Tom, causes in you, is a price that you are willing to pay.

With affected calm he grabs one of her arms and guides it through the sleeve hole of his shirt (nearly risking to spoil her efforts to keep her intimate parts covered) , and then does the same with the other one , somehow infusing the whole scene with unneeded sexual tension.
You are barely able to stand this sight, but somehow it has also the effect of putting your crush's nakedness, acutely back under the lens of your own desire.

"There you go, babe." Concludes the douche, pulling him the edges of the collar of his shirt, and Miranda's embarassed face with them, inches form him, almost like he's about to kiss her.

"T-Thanks."It's her infuriating, sheepish reply.

"Cute, i really mean it, it looks just like you've spend the night together ... But i'm afraid the shirt has to go." Intervenes Sarah curled up in her own seat.

"What? Why?" You ask, proably intercepting the thoughts of everyone else in the room.

"Because her penatly is, quoting myself here : 'to undress and stay in such manner for the rest of the game.' So part of her penalty is specifially to remain like that. It was nice of you John to try and help her, and daring Tom to put his shirt on her was kind of clever, but the penalty is still active, which means that she has to take off the shirt even if it was someone else who put it on."

Reluctantly, Miranda starts doing what Sarah said, struggling to get it done with just one hand (but you're quite happy that Tom didn't think of helping her to take it off...), while the other one stays on guard duty on her crotch.
The little bit of life this had reignited in her, vanishing again.

"Wait, wait ... isn't there a conflict with my dare? I mean i asked specifically him to put his shirt on her ..."

"Yeah you did, and in fact he has done that. I don't see a conflict. You should have said something like that the shirt had to stay on her for the rest of the game, but actually you couldn't have, as that wouldn't have nothing to do with Tom."

"This means i can put it back on?"

"Shut up dude, pull your name." You hiss at Tom before throwing him the hat.

"T-Thanks anyway, John, it was ... nice of you."

Miranda's words at least seems to be partially able to heal your bruised ego.
Knowing that she appreciated the effort, even if vane, it's your consolation prize.