Matt, thankfully.

You nervously shift your gaze between your angry best friend, his smiling red-haired crush and your own brown-haired one.
Matt wants to kill you, but at least you don't have to worry about Miranda's reaction.
She's totally unaware of the situation and is still texting on her phone.

"Matt." Sarah exclaims breaking the tension.

Thank God!

Maybe if he gets into the game he'll start to loosen up and will forget of what's just happened.

"Look at you, boy, you're all tense." Continues Sarah in a symphatetic tone.

"I know Miranda shows strained you boys good. Look what happend to Tom."

She pauses.
Out the corner of your eye Tom raises his gaze from his phone to nod knowingly. Matt looks at his crush in aticipation.

"It's your dare, so hmm... I can't really involve one of the girls... Hear this, why don't you jerk off for us?" Sarah asks with hesitant grimance.

Your friend is clearly disappointed. But Sarah's right, she has her hands tied.

"Wait, I've got it. I dare you to jerk off for all of us to see .... you have five minutes to cum. If you don't, hmm... you'll have to get yourself naked and try to deepthroat one of my dildos."

Matt's eyes are almost popping out of his head.

"W-What ... ?? ... h-how should I ... a dildo !? ... f-five minutes ???" He stammers.

"You can ask for an help, a visual help, from one of the girls." Concedes Sarah with a smile, ending his protests.

"From whoever I want?" Asks Matt skeptical after a long pause.

In the end this could turn out good, and your friend may have come to the same conclusion.
He will probably seize the opportunity to expose more of his crush skin.