Jake lets the Doc have full reign on you.

Jake grins from ear to ear.
"Why, Doctor! I didn't you were capable of this..." He says.
"Mr. Meadows, I have my needs..." The Doctor says. "Now, I could avail myself of any of the test subject I have lying around but you know as well as I do that there is a certain special something about a... unwilling participant such as 427."
Jake says, "By all means then..." and gestures toward you.
"Thank you, sir."

Doc turns toward you and begins to unzip his fly.
You vainly struggle against your bonds.
"Hey, Jake, man, taking your dick is one thing but this guy is a whole different story, dude!" You say.
"Now, now, 427... Let's not be rude..." Doc says. "I have been told that I am quite the accomplished lover by some."
His pants drop around his ankles as he strokes his cock to full attention. It's about as big as Jake's is, with a big pulsing vein running down the side. He guides it toward you, his tip prodding at your entrance.
"Ah, I almost forgot!"
He reaches over to a machine next to you, pulling out a suction-cup attached to a wire. He licks the inside of the cup and attaches it to the side of your forehead. He switches the machine on and fills the room with a hum.
"I am very much interested in your brainwaves at the point of climax."
Then, he hilts his whole cock into you. You let out a loud squeak.
"You are a scientific marvel..."
He starts slowly, pushing in and out of your pussy with deep practiced strokes. He grunts in satisfaction, occasionally glancing at the machine beside you. Occasionally, he brushes a strand of long stringy hair out of his face.

He studies your face, "Fascinating. I was expecting more... resistance."

Behind him, Jake has sat down on the Doctors stool. He's fished his own cock out of his pants and is slowly jerking off to the sight of you getting fucked by another man.
"Yeah, that's her all over..." He says, "She says she doesn't want it, but stick it in her and she'll crumble like a gingerbread house..."
Picking up the pace, Doc pounds into you with vigor.
"Mngh, You bastards..." You moan out, "You're gonna, Ah, pay for this!"
Doc leans in and grabs the back of your neck, pulling you in for a kiss. It's sloppy, him mashing his mouth into yours. That must have done the trick for him because he then pulls out of you and cums all over you.
You yell out, "Fuck, fuck, fuck!" and flail your arms toward the Doc. He pulls away from you.
"Oh my." He says, pulling his pants back up.
"FUCK YOU ASSHOLE!" You scream.

In the corner, Al turns away and glances down at his cellphone. He's been trying to distance himself from this ordeal ever since you got here. He could never say it, but you're starting to think he's on your side.