The scene starts with Serene Siren leading Leana Lovings by the leash. They are both in scantily clad outfits with Leana having a ball gag in her mouth. She is led to a Sybian-like machine to mount it, reminiscent of a giant saddle that vibrates, almost riding a large vibrator. Serene Siren is at the helm of the controls of this pussy stimulating device commanding the intensity. The camera gets a shot of Leana in pure ecstasy as the machine does its work. Some adorable hearty-eye emojis appear over her face thanks to computer-generated graphics during the scene.

Serene Siren has a clipboard as she experiments on her sexual subject. She's also playing with her prosthetic penis as she babbles on like the mad scientist she's playing. Leana Lovings emotes as the damsel in distress as Serene starts up her sexual research on her bound-up subject. All in the name of science and Leana's appendage growth. Some lactation occurs from boobs which causes Serene to lick the milk off Leana's chest.

The scene's title splashes on the screen and the corny game show music ceases. Serene Siren's appendage is now full futa size as Leana starts to suck on it. After Serene is done stuffing Leana's face with her large plastic dong the camera suddenly pans down to reveal that Leana has grown a cock of her own. The experiment seems to be moving along successfully. Leana is more than happy with it as she starts to caress and toy with her new penis. It's starting to grow showing more success in Serene Siren's futa sciences. She's regaling at the sight of her subject growing a large appendage like her own.

Serene Siren lends Leana a hand as she starts to masturbate the large dong. They also begin to sword fight with these large penile weapons they've spawned on their bodies. Leana gets back to sucking off Serene Siren. The result of this is Serene ejaculating clear white substances all over Leana's chest from her large fake penis. Serene is extremely satisfied with her test subject as she lays her out on a cushioned research table top to mount and inserts her large futa cock into Leana's pussy. They start banging in side saddle missionary as they suck and fuck each other. The camera moves close to the penetration while also moving the camera to Leana's face as she sucks her large dick. They then scissor with their huge cocks rubbing up against each other. Leana's is big enough that they can both suck on the tip of it together while they scissor.

Leana gets on top of Serene in a cowgirl formation which also allows Serene to suck off Leana's large dong. Doggy style is next on the menu of sex positions in this futa fuck session. Then on to side saddle in spooning as Serene continues her session of fucking her futa test subject. Leana's large futa ejaculates into her mouth as she sucks herself off while getting fucked by Serene.

The final futa load is ready for Leana as Serene drenches her twat in shiny white ejaculate. Animation takes hold of the screen as a detailed view of Leana being inseminated with the futa-wiener results in eggs floating around in her. She's immediately impregnated thanks to bodily prosthetics. Leana then has the eggs, tiny white balls, fall out of her pussy into a metal tray held by Serene Siren.