Step Sister Corruption Part 92 – Day 55 Endurance (fiction, M/F/F, d/s, teaching, step siblings, con)

*Gabe*

I can’t believe the girl’s talked me into this shit.

After my birthday, on Monday we had our meeting with Dr. Braxter letting her know that we will participate in her test being subjects but had to meet a few of our demands.

Our first demand was that Summer be included in the same test as us.

The second was we be tested at the same time.

And three Dr. Braxter got us a contract outlining everything and get us the most money without losing their ability to sell their eggs so they could get extra money.

That was the girl’s main concern being so they could get as much money as possible.

Dr. Braxter of course agreed with her own privados. The girl’s needed to switch to the o-plug which they admitted they had. Dr. Braxter was taken back for a moment but asked how long ago. The girl’s admitted not long ago but it was long enough for Dr. Braxter to request an emergency egg test.

Dr. Braxter wanted me to go do an endurance test. And required the girl’s to submit to a full calibration test before she could proceed on anything.

All of us naturally agreed.

Dr. Braxter immediately called the labs where the girl’s did their switch and scheduled their egg test along with prescribing a calibration package be put together after their test. And Dr Braxter scheduled my endurance test for Friday along with requesting I stop taking all of my supplements so the test could be valid.

Before we left she immediately started calling and said to come back to her Wednesday.

We went off and did our classes as scheduled. I did my homework that night and stopped taking all the supplements I had taken.

Summer and Kel were adamant about draining me of my sweet flavor enriched semen until the supplements wore off and would go back to being just protein enriched.

So for the next few days the girl’s did nothing but give me non stop head coaxing as much of my cum as they could. Summer was the greediest with coaxing as much cum out of me closely followed by Kel when Summer was at work.

It was pure heaven having the girl’s immediately giving me a blowjob as soon as I was ready.

Then Wednesday came and we visited Dr. Braxter again and she had our contracts ready.

As stated if the potent mixture doesn’t take hold we will receive a one time payment of $90,000. However if the mixture takes hold we receive an immediate $50,000 up front payment along with a monthly stipend of $20,000 for myself and the girl’s get $16,500 a month.

The girl’s of course asked why I got more and they got less.

Dr. Braxter explained that was the highest she could get without giving up THEIR ability to sell our natural sexual by product. Along with explaining that the girl’s would make much more from their eggs than I would from my cum.

She then explained that if the effects are still present after 5 years she could renegotiate a new contract to pay us more.

So effectively Dr. Braxter got us a contract that would potentially pay us nearly $200k a year. Well I got nearly $240k a year.

No idea if that was pre tax or after taxes.

I’m gonna go with pre taxes.

Still it was enough to make us all sign on the dotted line so fucking fast that I wouldn’t be surprised that the document went up in flames.

And that puts us here.

The girl’s went off to the appointment and I went to a different floor for my appointment.

I wasn’t surprised on the location because it was the same location as last time….one of Muschi’s fertility clinics. Just on a different floor.

I waited in the lobby that looked just like the last waiting room…..a typical hospital waiting room. Sitting on the most uncomfortable chair just like any other hospital I’ve ever been in.

I wonder why these places go with these uncomfortable chairs and this bland paint job.

You would think for a fertility clinic they would go the extra mile and spend a little bit more for something more comfy and a nicer paint job.

Or at least a separate TV channel other than some educational bs.

I waited pondering my thought.

Maybe some lazy boys here and there. Maybe a decorated mosaic on the walls of something cool.

A female came out, “Gabriel Newman.”

I got up and noticed for the first time I was completely alone.

Huh you’d guess for a fertility clinic there would be more guys waiting. Maybe I came in the right time or they were slow.

Still I walked up to the female. The female smiled, “Followed me.”

She walked and spoke, “You’re here for a endurance test?”

I spoke, “Yeah whatever that means.”

The female laughed, “Oh you’ll see.”

I suddenly heard some grunting and moaning coming from the door that read ‘Employee Office’.

I tried to ignore the fact that there was some obvious fucking coming from the employees office.

Guess everyone has urges.

The woman lead me to a door that read ‘Endurance Room 3’ and under it read ‘Ready’.

The woman opened the door and let me walk into a room. I stopped mid stride and blinked in astonishment.

In the room, which was completely white, had a small bed. Some reading material and lube. And above the obvious cheap ass bed was a TV.

Now none of that would make me stop dead in my tracks.

What laid on the bed did make me stop dead in my tracks.

On the bed was a near life size female doll in all her glory laying on the bed.

Let me repeat that……there was a fucking sex doll laying on the bed.

The doll that laid on the bed nonchalantly was completely nude with its legs and arms up against the body like it was freshly out of the box. It’s long flowing blonde hair looked fresh. It had big ass fucking titties, if I had to guess was a D cup, that looked perky…..and plain wrong.

If I had to guess if I stood the doll up it probably would stand maybe 4’5” and possibly weighed 70ish lbs.

I stood there completely shocked at what I was seeing. Then the female who led me to this room said the most astonishing thing I had ever heard until this moment, “If you don’t like this doll we can put a different one to more match you’re” she actually coughed, “needs.”

Was she making an insinuation that I might be gay?

I looked at her, “Excuse me?”

She looked at me, “We can take the doll out and put in one that more matches you’re preference.”

I blinked, “So what like a red head?”

She nodded, “If that’s what you prefer, sure.”

I looked at the doll then back at her, “No I think I’m good.” As I tried not to think that a red headed doll might remind me of my mom. That would definitely be a boner killer……that’s if I hadn’t already fucked her which might make my hard on harder.

God I need to see a shrink.

The female smiled, “Perfect. You’ll find a nice selection of porn on the TV. Water based lube for the doll. Have fun.”

I looked at her and spoke before she could leave the obvious uneasiness that I had about this whole situation, “Excuse me if I’m not understanding how a fuck doll is considered a viable way to test against endurance? Or even how this warrants as an endurance test?”

The female blinked before she smiled, “Oh.”

She turned to face me, “As you may know watching you fornicate with a person or filming it is how we used to do by timing your session with an actual person or using some type of masturbatory device such as a velvet sleeve. This doesn’t actually give accurate data where was this, “ she held out her hand towards to life like doll, “actually measures your output in real time data.”

I looked at the doll afraid that it might move or start breathing. It was that life like. I spoke trying to not imagine the obvious creepiness factor, “Would one those milking machine’s you all should have work better?”

The female laughed and spoke, “Sure but they won’t be able to do nearly as much as this doll can. This doll will measure how much lube you use. Measure your length and girth. It’ll time your duration. Measure your sensitivity through random contractions. And finally measure you’re output when you,” she coughed, “cum. It’ll also measure your pressure, amount per release, final amount. As well as measure potency, chromosome count, and percentage of virility. Our machine’s as you put it only collects sperm nothing else nothing more.”

She smiled at the doll, “It really is a fantastic piece of hardware and makes collecting male fluids fairly easy and takes all the guess work and time to answer all the areas I’ve mentioned.”

She pointed to the chair in the corner, “You can put your clothes on the counter. When you’re done just flip this switch and a red light will come on letting us know you’re either done or need help.”

She backed out, “Have fun.”

And closed the door.

Leaving me with the creepy fuck doll.

I looked at everything just feeling completely weirded out.

Why am I weirded out?

Simple….I had non stop pussy access for a while now. And now they’re wanting me to do the whole jerk off thing again.

I pulled out my phone and immediately texted Summer.

*Me: you busy?*

I wasn’t expecting Summer to text back so quickly but she did.

*Summer: sort of. What’s up?*

*Me: Well I’m here for that endurance test and you won’t believe what’s sitting in front of me*

*Summer: what?*

I quickly took a picture of the doll and sent it to her.

*Summer: is that what I think it is?*

*Me: if you’re thinking a fucking sex doll then you’d be right*

*Summer: **LMFAO** that’s rich. At least your test is a lot easier than ours*

*Me: how so?*

*Summer: let’s just say sex is off the table for a few days and leave it at that*

*Me: **WHAT!!!** Why?*

*Summer: well Kelly and I just got done having our eggs retrieved. Kelly had 5 eggs and I had 4. They sent them off for Dr. Braxter’s additional testing that she asked for. But their initial testing on one of our eggs looked promising saying they expect nearly the full $1200 per egg payment if we continue but because this was the initial testing we’re not getting shit. But the reason sex is off the table for the next few days is because of the calibration testing we have to do*

*Me: ok……*

*Summer: it’s easier if I show you when you get home. Just don’t get pissed and we’ll explain. They’re still giving us the details.*

*Me:*sigh*ok*

*Summer: in the mean time just fuck the doll have some fun with it get as much of your frustration out on the thing and we’ll see you when you get home*

I growled to no one in particular.

*Me: fine*

I put my phone back in my pocket and looked at the weird ass doll.

I guess I should it least feel the damn thing.

I walked over from my spot which was as far away from the blasted thing as possible.

Yes I was that creeped out and I’m not afraid to admit to it.

I reached down and groped the dolls breast.

Ok my creep factor just went up a notch and not in the whole this thing was creeping me out. Now I felt like a pervert who couldn’t get a girl to go to bed with me creeper.

I felt the breast and was semi amazed at how almost life like the breast felt but it was nothing compared to the real thing.

My asshole side of me popped out as I couldn’t help myself from smacking the unreal fun bag just so I could watch them jiggle. Only to be disappointed they didn’t jiggle much.

Just like Kel‘s magnificent chests they didn’t move much. Only difference is when I played with Kel’s glorious mounds I got the extra benefit of playing with her hardened nipples which in my mind was just as fun as the rest of Kel’s sensitive body.

Kel wasn’t the only one who was fun to play with….Summer.

God just thinking of all the things I could do to either body. The reactions I got from teasing either girl’s nipples. The way Summer can fully take me in her mouth and still have room to lick my boys. I feel if she could unhinge her jaw she would just to fully take my twig and berries.

Hell there’s been a couple of times she playfully put my flaccid dick and put my nuts in her mouth rolling my balls in her mouth with her tongue. Slowly releasing my testicles as my dick slowly elongated and hardened in her mouth.

Sometimes she would do just that put my flaccid dick and balls in her mouth and as my dick hardened she would challenge herself remaining latched until my dick was fully erect and try to hold until she needed to come up for air.

The few times she had done that she had remained longer and longer down with both my devices in her mouth as she tried to continue to use her tongue to roll my balls with her tongue but with my hard dick hitting so deep in her throat made the task difficult. Still she tried and as always felt amazing.

I shuddered remembering that feeling.

Just having that done the first time I remember immediately cumming right when I got hard.

God ever since I had started taking those supplements I had been always sporting a semi always ready to go at an instant moments notice. So whenever Summer goes down on me I’m already hard before she could put ALL of me in her mouth.

Still didn’t stop her from trying.

I realized thinking of all of that my groin was suddenly getting painful due to the constraint.

Ok it was time to do something about this as all this thinking just made me ungodly horny.

I unzipped my pants to release myself from the pain of having my hard on confined like it was feeling instant relief. I kicked off my shoes. I took off my pants and removed my boxer briefs letting myself hang in the nice cool air. Finally I removed my shirt so now that I was naked.

Well mostly naked. I kept my socks on because no telling what leftover residue was on the floor and I didn’t want to get some weird ass fungus from poorly maintained cleaning.

I got down to the bed and lifted the doll’s legs so they were in the air with enough room for me to move into.

I was surprised at how easy the doll’s legs moved but not overly easy. I was expecting the doll’s leg to limply fall as soon as I let go but it stayed place showing me the doll’s holes.

I grabbed the lube and instantly realized I hadn’t masturbated in so long I almost forgot what to do…..almost.

I opened the cap and poured some lube onto my dick and used my hand to coat my dick in the lube.

Then I put some lube onto my fingers and inserted my neatly drenched fingers into the waiting dolls almost lifelike pussy trying to not think how firm the inside felt.

I was happy that when I touched it true to their word that it didn’t feel used. Or in this case cleaned for my usage.

It would be an instant boner killer if I stuck my fingers in the doll to come back with someone’s leftover jizz.

Happy to find it clean-ish. I tried not to think of how many guys fucked this doll before me and twisted my fingers in the doll until I was satisfied that the dolls appendage was properly lubed.

I looked over at the table to find some handy wipes. I grabbed a wipe, opened it and clean my hand of the lube.

No reason to not be clean.

Really don’t want my hand to slip and lose balance…..right?

With the cleaning done. I angled my pecker towards the dolls glistening opening and plunged my hardened flesh into the doll instantly recognizing the sensation as velvet. The same velvet as some of my false pussy masturbators that were wrapped in towels hiding under my bed collecting dust.

As soon as I plunged my dick in I instantly wished it was a real body and a real pussy. Preferably Kel or Summer.

Pisses me off they were out of commission because of this single act of agreeing to being fucking test subjects.

I shook my head trying to focus at the matter at hand.

I had to fuck this doll.

Might as well give it my all.

At first I started just going slow letting all the lube I applied to my dick and to the doll start making all the untouched area get coated so my job would be easier.

I had to pull out a couple of times because between whatever the doll was made out of, the cool air and the water based lube kind of made whatever lube there was start to make the doll’s pussy start gripping.

I wanted my normal results.

Still I pulled out. Applied more lube to my dick without touching it. And liberally applied the lube to the doll’s opening by picking up the dead fish so the lube will go into the preferred opening.

Then I stuck my dick back in happy it was nice and slippery.

I slowly brought up my pace slapping my pelvis into the doll so much that the pseudo fake breasts were beginning to bounce with each thrust.

I tried to think of my normal go to’s to help me last trying to not concentrate on how good this felt.

Games. I thought of the walkthrough of my favorite nostalgia game. My guilty pleasure I go back to every so often though it was over a decade old. Or least the re-released mod was over a decade old.

Once I went over the entire walkthrough in my head. I skipped to my next go to…. console games.

Or at least I tried when I felt the pussy slowly tighten around my dick and start to pulsate as if the doll were having an orgasm.

I nearly jumped completely back and would have freaked out thinking I had fucked the doll to life if the person who led me here hadn’t mentioned it.

Still it made me jump and freak out for half a second.

Fucking technology of this doll was so life like I almost could have sworn the sensation almost mimicked an actual orgasm…..almost.

It was too slow and all sorts of wrong.

Still I stopped to let the sensation wash over me.

Yes the sensation is a guilty pleasure of mine.

Once the light pulsating stopped I started my rhythm again.

Each time the fake pussy started to pulsate I stopped just to enjoy the sensation never bringing up my tempo beyond what I considered a slow-medium pace.

I was out to break a record for edging myself.

I wanted these results to shock Dr Braxter’s internal assumptions about me.

Still didn’t the female say it registered EVERYTHING? Meaning it would register I took my sweet ass time.

What guy in their right mind would take their sweet ass time fucking?

This guy that’s who.

Sure I may try to beat both Summer’s and Kel‘s pussies with my dick like they owed me money but it wasn’t ALL the time.

For the most part our tempo always changed depending on the situation.

Sometimes I’ll slowly fuck Summer and or Kel just to watch them squirm and beg me to pound them harder and faster driving them madder and madder with lust. Especially if Summer teases me then it’s a guarantee I’ll do a nice slow rhythm just to drive her insane.

Or another thing I’ll do just to be a dick is fuck them really fast bringing to the edge of a orgasm then pull out smack their ass with my pussy juice slicked dick and run off. Especially when it was time to go to school.

But usually Summer and or Kel pay me back for that little tease by rubbing my cock during the drive and then stop to not do anything about it.

Fuck I was getting side tracked.

At least it was helping me last.

I decided to bring up my tempo so now I was at a medium pace.

Now the falsie tits were really moving.

Still the doll’s blank expression was making it hard to stay focused at the task at hand. Or was it the perfect distraction?

Nope I’m going with creepy.

I turned the head happy it actually moved. And grabbed a towel off the table putting it over the head so the blank expression didn’t remind me of a dead fish.

Maybe I should have turned on the TV so I could be distracted.

I reached over to the table and grabbed the remote.

I turned on the TV while fucking the stupid doll letting my mind wonder so I wouldn’t focus on my dick’s wild ride in a motionless pseudo body.

I looked at the options a little irritated that it was connected to nothing but porn.

Now that’s a creep, pervert, level of fucking right here.

What sensible guy would watch porn while his dick was stuck in a sex doll?

This guy that’s who.

What???

I said I’m a guy. Not a fucking Saint.

I plugged in some regular good ole vanilla porn. I stayed away from the other more variety porn mainly because I wanted the distraction. Not to get sucked in to some weird porn.

Eventually I found a fantasy cosplay adaptation porn.

I watched the film and in typical style it got to the sex right away after the intro but eventually it got to a semi good story….semi good being generous.

Still I watched not realizing I had brought up my tempo and sweat was beginning to form all over my body.

Imagine my surprise when I had gotten to the third scene without fast forwarding the relatively simple movie plot that I had distracted myself from what I was doing I felt the tell tale signs I was ready to cum.

I’m at the point of no return.

I could either stop and edge myself which was my goal. Or I could keep going and finally cum.

Wait how long have I been here?

Before I could make my decision my balls bounced in my sack as my sack tightened around them and I felt my dick start releasing it’s load.

With one final thrust I plunged my dick as hard as I could into the stupid doll thinking *you want to measure my output I’ll give you my fucking output bitch!*

I grunted as each shot of my load passed through my system into the motionless doll.

Splurt after splurt got pumped into the sex doll as I forced more of my dick into the doll only to semi relax as my dick sprayed another shot and I forced my dick just the few extra millimeters making sure the doll got it’s fill. Until finally my dick stopped pulsating as my nuts stopped their unload bouncing dance that they normally do.

I panted and collapsed on top of the doll finding it’s cushion to be pleasurable as I left my dick inside it’s orifice not really caring of anything letting my dick begin its shrinking process and letting the remaining body fluid still stuck in my tubes to leak out into the doll.

My only thought as I panted on the stupid doll *how’s that for endurance bitch?*

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