It was just to earn a few extra bucks. You had plenty of buddies do these kind of 'studies' before and they all told you they had great experiences and made up to a thousand bucks doing it. You found one that was posted for $10,000. Thinking you won the lottery you signed up without hesitation.
The study wasn't anything like you thought it would be. Why were you naked? Why were you restrained? What was this black goo that was was clinging to your body? You were helpless to do anything but watch as the black goo encased more an more of your body.
A small robotic instrument just finished pumping the black goo down your dick. You were confident your entire body, both inside and out, was just latex. Nothing but dense, slick, rubbery, latex. And you, a latex fuck toy drone.
You had no face, no mouth. There was no way for you to express your fear and anger. But as easy as it was to feel anger, it was even easier to feel insanely horny. Whatever they put in goo must have been laced with some aphrodisiac. Soon, your anger turned to lust, and your fear turned to pleasure. All you wanted was to be used for your new purpose.
A door opened from across the room. That must be the professor... Finally.