Morning?

You wake up with the Sun coming through the window onto your face.

You groan and stretch a bit, but you're sore all over. You feel like you got hit by a bus. I guess I'm not used to fucking four times in six hours...

You look over to where Nicole sleeps, but she's already left for work. You turn to check the clock: 11:46am

"FUCK! I'm late for work!" you shout, jumping up out of bed and immediately crashing to the floor, tangled in your bedsheets. You pull yourself to your feet and run to the bathroom.

Moments later, you're in the shower, furiously scrubbing, trying to formulate an appropriate "three and a half hours late for work" excuse when the bathroom door opens.

"John?"

It's Sara.

"Yeah?"

She pulls the shower curtain back, revealing her full nakedness to you for the first time. You're completely stunned. She's perfect. She's just about everything you're attracted to in Nicole, but younger, tighter, curvier, hyperfeminine and hypersexualized. The look in her eyes is ****.

"I... need..." she says, stepping into the shower with you. She doesn't say anything else, she presses her slick skin against yours, and tilts her head back. Your hands wrap around her, one on her hip, the other cupping a tight teenage ass cheek. Your lips find hers, and you begin furiously making out with your girlfriend's younger sister. Her tongue intertwines with yours and her small hands are wrapped around your big cock, twisting and pumping up and down.

You slide your hand down to under her knee and lift her leg into the air. Without breaking the deep kiss, she guides your erection into her wet pussy. You hesitate for just a moment, and pull your lips from hers.

She answers your unanswered question.

"I'm sure. Fuck me."

With the green light, you push forward and feel her hymen burst as you take the eighteen year-old girl's virginity in your shower.

Minutes later, she puts her leg down and turns her back to you and bends over, inviting you to take her from behind. You have her face and huge tits pressed against the cold tile as you jackhammer her never-before-used teen pussy with every ounce of your being. It's hot and wet and tight and grips your cock with every thrust. It feels like you're fucking an angel fell to earth.

"I need your cum, John," she starts to beg. "I fucking need it. Gimme your cum, John! I need it. Fill me with it. Fill me up. Gimme every drop!"

You feel the familiar sensation in your balls, so you pull out from her cunt.

"On your knees!" you order her, and she drops obediently, opening her mouth and sticking out her tongue.

You reach back with one hand and shut off the shower as you pump your dick with the other.

She cups her hands under her huge tits and lifts them up, presenting them to you as her big blue eyes beg for your cum.

"Ah, fuck, fuck, NNNNG!" you shout as you fire off thick ropes that completely fill Sara's mouth and cover her face. She looks like she's been dunked in glue.

She slurps and swallows all the sperm in her mouth, and then you use the head of your dick like a squeegee to push the cum that's coating her beautiful face into her mouth, reveling in the extra kisses and licks she gives your cock as she cleans every last drop of semen from it.

She holds up a hand, and you help her to her feet.

She throws her arms around you and hugs you tightly.

"Thanks, John. That was incredible." She gets on her tiptoes and plants a kiss on your cheek.

"You're, uh, very welcome, Sara."

The two of you get out of the shower and start to dry yourselves off, and then the doorbell rings.

You jog to the door with a towel wrapped around your waist. You look through the peephole, and you see a pretty half-Korean girl with long black hair--your lab assistant Jenny. Fuck, she's probably here wondering why the fuck I didn't show up to work today.

Nothing to do about it now. You open the door.

"Hey, what's up?" you say.

"Move!" she yells, and pushes past you into the apartment. You can see she has a pair of bags over each shoulder, a largish box, and a small cooler. Jenny is an interesting specimen. She's twenty years old, a junior in the biochemistry department and your lab assistant for the past year and a half. She's naturally short and petite, like most Asian girls, but a lifetime of playing soccer has given her a muscular butt and legs. Her western side manifests in much bigger tits than most Korean girls you've met. Probably big C cups, but on her tiny frame, they look even bigger. She has a killer smile, a massive IQ, and the vocabulary of a sailor. All these contradictions converging in this undeniably sexy package means she's constantly fighting off both men and women with a stick. Today, she's wearing her usual uniform: A tight brightly-colored t-shirt from some band you haven't heard of with the neck cut out to show a little cleavage, skintight jeans with lots of rips in them, and black Chuck Taylors. She puts everything down on the table and finally looks at you.

"Woah, hey John. Nice towel. Really shows off your cock. I didn't know you were circumsized," she smirks as you readjust your towel.

"Thanks, Jenny. What's all this stuff?"

"It's everything you need. Nicole called and told us you're going to have to work from home the next few weeks," she walks into the kitchen as she talks.

Nicole, you're a life-saver.

"So I figured I'd just bring everything by myself instead of making you come down to the lab. Also, not gonna lie, this means I don't have to go back today, so... half day for this bitch!" she comes back out of the kitchen with a pair of open beers and hands you one. You put your beer on the table.

"I need to go put some clothes on," you say as you head to the bedroom.

"Oh, come on, John! I'll show you mine if you show me yours!" Jenny bursts into giggles as you close the door behind you.

Sara is standing naked in your bedroom with a towel barely covering her.

"John! I need to get across to my room so I can get dressed," she tells you.

"Shit, okay. Uhh, it's my lab assistant. She brought me stuff so I can work at home. So, you just need to sit tight in here for maybe twenty minutes while we go over a few things, and then she'll be out of here, okay?"

"Ughhhh. I guess," she sighs.

"Let me rephrase that: she brought me stuff so I can be here to keep you from dying. Can you chill in here for a little bit, please? I 'd rather not have to explain why I'm working from home."

"Yeah, of course. Sorry. I'll just... read a book," she says bending over to peruse the bookshelf, exposing herself beneath the towel. You start to get dressed, but your eyes keep going back to that perfect eighteen year-old pussy.

You manage to get some clothes on, but your dick is throbbing in your jeans.

"Just stay put," you whisper, exiting back into the living room.

Jenny has unpacked some of the stuff from the bags and boxes, revealing your work laptop, and a few pieces of lab equipment. The cooler is no longer on the table.

"Hey, John, I stuck the blood samples in your vegetable crisper," she says by way of acknowledgement.

"Great. And what blood samples are these?"

"These are the donor samples so we can finally start our trial of Dr. Lewis's method," Jenny replied, draining the last of her beer.

Dr. Lewis, a scientist working out of Cal-Tech, had reportedly developed a **** for accelerating male recovery time post-orgasm and accelerating sperm production. It wouldn't cure the addiction, but it would certainly make administering treatment a lot easier. The issue was that Lewis wasn't equipped for large scale trials, and only two of the twenty men who volunteered to be his test subjects actually experienced the desired effects. So, your lab would be running analysis of his test subjects blood, both pre- and post- treatment and try to figure out how to improve on what Lewis had done.

"I love your apartment," says Jenny. "Very roomy. I could really host a gangbang in this living room."

"Yeah, I bet."

"No, really. Move that couch over to the wall, and it's like this place was built for a gangbang. Didn't Nicole live here by herself before you two got together? If I were her, I'd have had this place packed wall to wall with dick," she laughs.

"Right on, Jenny. Well, if that's everything... you should get going."

"Sure, just one last thing," she says, reaching into her purse and producing a small plastic cup. "We need a sample of that perfect cumshot for some lab work."

"Another one?"

"Hey, it's not my call. Dr. Winslow says you're in the top percentiles for everything we're trying to test. You gotta share that perfect jizz with the planet. Don't be stingy." She steps close to you and leans in. "Cum for me, baby," she grins and tosses you the plastic cup. "Would it help you get there if I stripped down to my bra and panties? Maybe gave you a lapdance? Hm? Me love you long time? Sucky sucky five dollar?"

Yes, yes it would.

"You know, it just might."

"I knew it, you fucking perv. Quit staring at my tits and go jerk off already."

You take the cup into your bedroom, to find Sara splayed out on your bed furiously fingering herself.

"What--" you start.

"Fuck me, John! Fuck me right fucking now!" Sara begs.

"I need to give Jenny a sperm sample," you say, holding up the sample cup even as your dick grows at the sight of the beautiful teen.

"Please, John. I'm so fucking wet for you," she says.

That's all you need. You drop your pants, pop your shirt off, put the cup on the bedside table and climb in between Sara's legs. You give your cock a stroke to get it lined up, and then drive it home into her tight teenage twat.

This time, as you fuck her, she's staring deep into your eyes, her moans and whimpers just hot little breaths into your face. Her big teen tits are bouncing and jiggling in time with each of your thrusts. Her blue painted fingernails scratch down your back.

"Cum in my mouth, John. Please. I love the taste of your cum," she says as you pound her cunt.

Your balls tense up.