Another scientist

"Hey Chae, I need you to..." A lab coat-clad woman bustles into the room, taking a few strides before seeing her colleague with her lips around your spire. Then she freezes, and drops the clipboard she was carrying.

"Oh. My. God. I'm going to..." the scientist turns to leave, but she's walked past you, and you reach out to close the door, looking the arrival up and down. She's another gorgeous Korean, noticeably better-endowed than Chae, her hair dyed an attractive fox-red.
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"Ssi-Bal, Chae!" swears the woman. "What the fuck!?"

You think fast of a way to prevent the intruder from leaving in the next few seconds. "Chae, kiss her," you order. The doctor smoothly rises to her feet, and ignoring her protests, places her mouth over the other woman's, and kisses her deeply.

The redhead scientist finally overcomes her surprise to push away her sex-addled assailant.

"What the fuck?" she repeats. "Why would you...?" Her pupils begin to dilate as the extremely potent precum transferred from mouth to mouth begins to take effect.

"It was just a kiss for my sister," pouted Chae innocently. You feel your cock grow another five inches in arousal before you rein it back again. "What's so wrong about that, Cho?"

Cho frowns cutely as her brain chemistry alters. "Nothing, I guess. But... what are you doing with {if Futa==true}her? Wait - that's... that's a..." She stares at your cock in disbelief.{else}him?"{endif}

"I needed to run a tactile test," grins Chae. "And I really have to get back to it - but I could use a second opinion..."

Her sister huffs sarcastically, but you can see arousal beginning to enter her body language. "What about your husband, Chae?!{if Futa==true} I thought I was the bisexual sister, but this...{endif}"

The doctor shrugs impishly. "Cheating turns me on. Or maybe {if Futa==true}Mikaela does. Come on, sis, taste her big, thick, perfect{else}Michael does. Come on, sis, taste his{endif} penis, you won't regret it."

Cho takes you in, and you see her eyes first widen in surprise as she really sees you, then narrow with a flame of lust.

"I suppose there's no harm... if it'll placate my sister..." she murmurs, walking towards you in a dreamlike state. Kneeling, she holds your cock in her hand, loosening her collar with the other. Her lips part, and she leans slowly in. When she's mere millimetres away, and you can feel her hot breath on your head, she looks up at you, carnal desire writ clear on her face. Never breaking eye contact, she shoves her mouth right over your shaft, your cock disappearing behind those gorgeous pink lips, finding its way all the way down her throat, until you finally bottom out. You exhale in shock and pleasure - turns out one of the sisters has trained away her gag reflex, and it feels amazing. Cho takes a few long, languid strokes, licking your length in her mouth and sucking in time, then suddenly starts to fuck you with her face, doing her best to keep eye contact the whole time. Groaning at the stimulation, you place your hands on the back of her head and give her a little help, making sure she kisses your scrotum every time, pounding her faster and faster. At the same time, Chae drapes her body onto you, kissing your neck lovingly. It takes a second after you feel the soft skin of her breasts on your arm for you to realise she's stripped naked, revealing a very arousing little body.

As Cho's eyes begin to roll back in her head, you release her, letting her dazedly roll onto the floor. Chae immediately seizes the opportunity to clamp her lips over yours and kiss you passionately, curling a leg round your waist. You caress her petite form, losing yourself to the ministrations of her tongue, her hands, each of you trying to consume the other.

It isn't long before the older sister joins the fray, rubbing her tits on your exposed side and {if Futa==true}sliding a hand down between your legs, where she proceeds to dip her fingers in and out of your wet pussy.{else}running a hand down both your back and Chae's.{endif}

Consumed by lust, your mind fills with a single craving: to penetrate these two hot scientists where evolution intended. You gradually pry each of the sisters' limbs from your body and onto their sibling's, until you have extricated yourself and the two women are locked in a passionate embrace, kissing each other like there's no tomorrow.

Moving round to Cho's back, for half a second you admire her beautifully rounded butt, her glossy hair cascading freely between her shoulder blades, the curve of her lithe, sexy body. Then you step forwards and spear deep into her pussy with all {if Futa==true}twelve{else}nine{endif} inches of your thick cock. Cho moans into her sister's mouth as she instantly orgasms. You begin thrusting in and out of her, almost lifting her off the ground, enjoying how her cunt is positively flowing with hot, lubricative juices. For most men she might be a bit loose - she clearly sleeps around - but your oversized beast is gripped perfectly, like they were made for one another. Probably helps that you can adjust your size to any woman.

Cho orgasms three more times in her sister's arms, both of them now rubbing the other's clit, and you decide to dip your toe in the second pond. You're physically unable to slam all the way into the thinner girl's slit like you had with her sister, but she moans long and hard as you slowly, relentlessly make you way up her tight passage. You reach halfway and pause, giving her time to adjust; in the meantime, you reach around and grope the four breasts that are squished together. Their nipples are hard, and wonderfully sensitive to the touch, Cho orgasming after only a few seconds from your fingers. Turning your attention back to Chae, you gradually slide further in, mouthing along her neck,{if Futa==true} dragging your breasts up her soft back,{endif} until you finally bottom out. The dark-haired girl shudders around you, moaning continuously into her sister's kisses. Her tightness is simply incredible, and as you slowly begin to pump in and out of her, the feeling only gets better. The only reason you can move in her at all is that your cock is so well-lubricated from their mouths and Cho's pussy. Soon you build up your pace, and Dr Chae is now moaning loudly in time with your rapid thrusts, orgasming every twenty seconds, not even able to finger her sister. Finally, you explode deep into her vagina, gasping as Chae orgasms with you, her tight pussy squeezing spurt after spurt from your monster. Ready to complete the set, you pull out of Chae and move round to her scientist sister, and slam your full length into her cunt. You both orgasm together, Cho convulsing with each oscillation of her pussy, synchronised with the gallons of cum you pump into her depths.

You withdraw from Cho's passage, to allow out a gush of white ooze, and admire your handywork. The two sisters cling to one another, frozen in pleasure's supernatural grip, as their eyes turn to gold.