After an intense session of stroking and kissing, you look into Steve's dark, magnetic eyes and whisper to him in a sultry tone: "You know, love... It's not fair that only the two of us can be this smooth and sexy. We should totally change our friends into other Barbie Boys".
Steve kisses you with his perfect plastic lips. "My thoughts exactly, honey. Come on, let's call Jason".
If your best friend thinks your new androgynous voice is strange, he doesn't say it. "I'll be there in maybe half a hour, dude", he tells you before hanging up. While he's coming at your house, you and Steve sit on the sofa, stroking your flawless, nipple-less chests and trying to think of a way to change Jason into a Barbie Boy like you two are: using a smooth smoothie would certainly change him, but that wouldn't be funny at all... And you can't put your cock inside his ass, because it's now a part of Steve's body, and you wouldn't want it back anyway: the sensation of constantly fucking and being fucked is way too good to give it up.
Finally, your bell rings and you and Steve - with your chests still bare - go open the door. Jason looks at you puzzled. "H-hey guys... What's up? Where are your shirts?".
"Why would we need one, cutie?", Steve replies, locking the front door behind Jason. "Our bods are the hottest around, after all".
Jason looks really uncomfortable now. "O-okay, if this is a joke, it's not funny", and he makes a step back, towards the living room door. A second later, he goes wide-eyed, and starts stuttering. "T-t-the hell happened to y-your nipples?! They're like... gone! And why the hell is your skin so glossy?".
You smile at him, showing him your perfectly white, shiny plastic teeth. "Don't worry, you will find out soon enough...".
Overpowering him is easier than you would've though: being made of plastic somehow makes you stronger and more durable than a normal human, and less than a minute later Jason is lying on your sofa, desperately trying to escape Steve's grip. "Let me go, you faggots!". You've already peeled his pants away and are greedily sucking your best friend's dick, that - despite his owner's intentions - is slowly becoming erect.
Steve's answer is to plant a long, deep kiss on Jason's lips. "Stop fighting, sweetie... You'll feel so much better when it's over...". And then he playfully bites one of Jason's ears, eliciting a short - but clearly aroused - moan.
Meanwhile, you're caressing Jason's legs with your hands, and you can feel them becoming more and more smooth under your touch. Great, it's working!, you tell yourself... And some minutes later you can feel Jason's now rock-hard penis detaching from his body, leaving only a smooth patch of skin behind. The soon-to-be Barbie Boy moans a couple more times, and then you feel his last human seed flowing down your throat, coating your plastic mouth in thick, salty spooge.
Jason's bottom half is now completely made of plastic, and the changes progress rapidly, enveloping his chest and giving his muscles definition. His face becomes twinkish and flawless, and you can see his mind becoming irrevocably and permanently gay through his baby blue eyes. "Thanks, honey, that was like the best blowjob ever!", he tells you, kissing you lovingly on the cheek. He's so adorable and hot now!
You give him back his now plastic penis, still covered in your drool. "Thanks to you, love, for letting me suck this baby".
Jason looks at his dick, lust and desire filling his eyes. "My ass feels so empty... I wonder what would happen if I stick my cock in there".
Steve french-kisses him passionately in response. "Believe me, sweetie... It's much better if you find a guy and stick it in his ass... And I'm sure he'll be more than happy to return the favor", he then says, before winking at you.