Possibly as Harriet has a stroke of evil genius

"Oh fuck that was hot, but I fell a little left out here." Harriet says as she greedily licks her pussy's juices from her fingers and moans.

"Well how about you let me and Tanya out of these devices and we'll give you your fill." You say in a sultry manner as Tanya smiles.

"Hmmmm very tempting, but no that's far too predictable." Harriet says as she takes a moment to stroke her chin, before let out a ecstatic shriek. "Oh yes, now that idea on the other hand I can get behind." Harriet yells out as she jumps from her chair and rushes over out of view, as you suddenly hear the sounds of metal being thrown across the room. "Oh where did I put it." Harriet says to herself as you look over to Tanya.

"Should we be worried?" You ask with a smile as you look other to Tanya as you take a moment to admire her new cock, and you try and imagine how much nicer it would feel deep inside of you.

"Mmmmm the only thing I'm worried about is what state we'll both be in when we free to fuck each other with these bad boys." Tanya replies with a seductive tone as she tenses a muscle which causes her cock to move, and you can feel your pussy twitch as a small amount of your own cum leaks out around the that pumped your own cum into you.

"A-Ha! Got you you naughty machine, trying to hide from your momma like that." Harriet says as she returns with what looks like a cross between a vacuum cleaner and an octopus. "Now I just need to find a suitable seat for myself." Harriet says to herself, continuing to ignore you both as she walks out of sight in the other direction of her lab, before returning with a similar chair as you and Tanya.

"So whats the plan Harriet?" Tanya asks with a grin as she watches her manic mad scientist friend rummage around and hook up some similar tubes under her chair and attaches them to the new machine along with a small wire, before she does the same with the hoses attached to you and Tanya's chairs

"Right, now for the finishing touch." Harriet say as she pulls out some futuristic looking injector with a clear liquid in a vial on the back, and injects it in the spot between your ass and pussy causing you to let out a shriek. Harriet completley unaffected by your outburst changes the now empty tube with a new one and does injects Tanya and then finally walks over to her chair and does herself. "Mmmmm thats the good stuff." Harriet says before lying back as the chair straps lock down holding her in the same restraints as you and Tanya are bound by.

"The hell was in that vial?" You ask as you feel your swollen pussy lips begin to warm up and your cock swells back up to it's rock hard state, as you feel your balls tingle and rumble.

"Some of my patent awaiting approval go juice. Has any guy or girl ready to go in a matter or minutes, although that was a concentrated amount to make this game more fun." Harriet says with a lusty groan as you watch her clit visibly swell and expand until it forms into a cock, complete with two huge balls.

"Mmmmm sounds fun, so does that mean the training wheels have been taken off our swimmers?" Tanya asks with a big grin on her face as you look down and see her balls seem to have swollen, which makes you look down at yours and you find that yours seem bigger too.

"Yup, those guys will be fighting fit and ready to breed now, wouldn't be much of a competition if they weren't" Harriet giggles as you look over to her and see her cock is now at full mast, and she mumbles something down to the chair, which causes the blowjob simulator to affix it self to her cock.

"Sounds perfect to me, so I'm guessing there's a good chance one of us will be getting impregnated from this game?" Tanya asks with a grin as she locks eyes with you and licks her lips.

"That's right, in fact it's possible we might all be knocked up." Harriet says with a giggle.

"Well me and Tanya with that fertility **** we had pumped into us." You say as you look at the machine positioned between the three of you.

"You're right, there's no fun if I'm not at risk to." Harriet says as she tries to move and then realizes the restraints she had just tied herself down with. "Run program BB crayZ." Harriet says aloud in a happy tone, and there's a sound of buzzing as a long mechanical arm extends across the lab with a large vialof the roiling red liquid from your earlier game, only this stuff looked more volatile.

"Confirm instruction, protocol currently irreversible and extremely potent." A mechanical voice says aloud.

"Confirmation code: Breed me sexy." Harriet responds with a giggle.

"Confirmation accepted, have fun mistress." The mechanical voice responds and plunges the injector into her inner leg and slowly drains the liquid into her.

"Right then, that should leave me a veritable baby factory just like you both, well maybe more so but it'll be more fun this way." Harriet responds with a gleeful grin.

"Well Ellie, looks like we're all fertile and ready to go." Tanya replies with a giggle as she twitches her cock again, as you feel yourself getting both horny and excited.

"Alright so let's explain the game." Harriet begins with a singsong voice. "So with my concentrated go juice, your cum will be very potent and you'll be able to cum again right after you cum, in fact you'll need to." She continues with a giggle. "Firstly we'll be filling up the tank in that machine in the middle, then once it's reach a certain point it will start to pump cum towards one of us." Harriet giggles.

"Sound hot as hell so far." Tanya says with a growl as you find yourself like the sound of this plan, although your thoughts might be being disturbed by the various unknown **** rampaging in your body.

"So how does it pick who to pump cum into?" You ask as you find your pussy beginig to tingle.

"Oh now this is the fun part." Harriet giggles as she takes a moment to compose herself. "Now to start its selected me, but it will change each time one of us climaxes with our pussy's which will be a lot easier than you think thanks to my go juice." Harriet continues as she proceeds to have an orgasm as if on demand. With that a holographic display above the machine in the middle of you displays a cartoon interpretation of Harriet's face before changing to a cartoon of Tanya's head as she grins in a cartoon exaggerated expression of mischief. "Now if more than one of us climaxes as the same time that's when things get more fun." As you and Tanya both let out a simultaneous gasp of pleasure as you both climax.

The holographic display above the machine suddenly displays a cartoon representation of your own face, looking exaggeratedly sweet and shy with bright red cheeks, next to your head was Tanya's and the two of them look at each other and their expressions change to panic as they look down at the pumps. "So of two of us cum at the same time with out lady parts then we both have cum pumped towards us." You offer in a breathless tone as you catch your breath as you look over to Tanya

"Yup, and if all three of us cum together, then we all get pumped, now given how often we'll be cumming, it'll happen a lot more often than you think." Harriet says with a giggle. "Now there's also a special prize if you two can produce more cum than me before the tank is full enough, but also a punishment if you can't, and as you can see my balls are a lot bigger and fuller so it'll be harder than it sounds." Harriet says with a seductive growl.

"Mmmmm so who gets filled with who's cum?" Tanya asks with a grin as she stares at you with a hungry look.

"Well normal sperm doesn't play nice, but thankfully my formula is less picky and happy as long as babies are made, as a result all the cum will pool together, so it's anyone's race for out eggs." Harriet giggles.

"So we could still end up impregnating ourselves." You ask as you look at the large machine in the middle and wondering just what was about to happen.

"Well given how likley it is for us all to ovulate more than once, it is possible that any of us could get pregnant with triplets with each of us as being the father of one." Harriet says in her overly cheerful tone. "Now enough talking let's start this game." Harriet yells with a hysterical fit of mad scientist laughter, as the machine in the centre powers up, and the blowjob machines and dildos spring into life. Alright first up is wether or not you and Tanya can fill the machine with more cum than Harriet's weighty balls.