(This was written with reddit editing in mind. Stuff between asterisks is italicised. Stuff in between “\* \*” denotes actions/sounds.)

I *MIGHT* have gone a little bit overboard. Ummm, my bad bro.

I kinda, underestimated just how addictive I could be...

BUT it's not like it's ALL my fault you were so easy!

I was minding my own business on the couch that first time. YOU sat beside ME. Our doctor *told* you about the pheromones from this thing.

I was a *little* bit horny. And there you were, your attention drifting from the tv down to the bulge in *your sister's* shorts... Until it was so frickin obvious you were staring, you looked so stupefied.

It-it was so fucking *hot.*

It got me thinking about the way you'd laughed off the advice of our doctor when she was explaining it to us. But then there you were drooling over the *outline* of your sister's cock. MY cock. I hadn't even *tried* anything and your eyes were glued to it.

[Ranting, kinda mad] You'd been *such* an unsupportive prick since I got the futa flu. And I'd been so timid and ashamed…

Looking back on it, I think maybe you were sitting beside me to apologize?

But anyways, there you were, and there was something sooooo satisfying about seeing you like that... Ever since I got this thing I'd been so horny. And the way you were looking at me... I was getting so thick and hard, and sensitive, it was rubbing against the inside of my shorts.  I mean, I just wanted to have a *bit* of fun.

I admit, it got, a little out of hand. Asking you to sing christmas carols while grinding it against your face was... Way out of line... I-I understand and respect that now, it probably won't happen again. But I mean, I was *REALLY expecting* you to say no... and your face felt so good...

And you liked it didn't you? Nuzzling into your sister's big cock?

Ha, you were *soooo* sure you would be able to control yourself, despite what the doctor said about how primal and powerful a big futa dick like mine would be.

When I told you to lick it I was just sortof, riding the powertrip. God the sight, and the *feel* of your tongue as you started lapping at it through the fabric for me. I nearly came right there.

I knew I shouldn't... But I was so horny. And... Somehow, my shorts and panties were pooling around my sneakers... I thought *just once* wouldn't hurt... And fucccck your lips felt so fucking good. I still remember your whimper of joy when I let your hot wet mouth engulfed my cock for the first time. I just *knew* how much you loved it. I'd been feeling soooo ugly ever since I got this thing, there was something so sweet about how into it you were.

But, I totally took it too far and that's my fault. The doctor warned me too, and to be honest, I didn't really believe her either.

So, it was going to be a one time thing, but...

Later that night I ended up sneaking into your room and seeing if I could get you to do it again... I wasn't going to make you do it- I was only going to check to see if I COULD get you to do it, or whether you'd gotten it out of your system.

There was something so maddening about the way you were trying to tell me it didn't interest you and it was gross and never again while you weren't looking me in the eye... The way you shutup when my pyjama bottoms hit the floor. The look on your face when my big cock sprang out, bouncing and bobbing in your face. And your eyes locked onto it and you whimpered again... Getting you kneeling in front of me as I sat on your bed was... intoxicating.

I-I just told you to kiss the tip so you could prove that you *wouldn't* do it...

And then you were slurping at me again, taking as much as you could in that hungry sweet mouth. Admitting to me that the feel of me twitching and cumming in your mouth was amazing.

And for me, pumping you full of cum was the most amazing sensation.

I know this is really awful of me... I know it's supposed to be addictive... But some dark instinctive part of me *WANTS* to just pump my cum into you, over and over and over till you're practically living off of it. Getting you gulping it down and seeing you with that satisfied, grateful grateful gleam in your eyes. It'd be so easy to do that to you... That awful thought gets me so hot. I hate it.

So... I was determined to limit us to one blowjob a day... But we're both messing that up... Slipping more and more we're pretty much on 3 or 4 now.

I can easily fuck you so much more than this too. My body is just so... *Primed* all the time. Whenever I see you, and a lot of the time I don't I'm wanting to drag you into my room and fuck you into a mini coma...

The problem is that it's so easy to get you squirming and slurping. It's starting to feel so right to have you on your knees, or pushing you down under the sheets...

The moment I get the urge now I just know I can go to you and bury this big sensitive shaft deep into that hungry wet throat... Mmmm you were SO much fun to train to deepthroat me too. A few nights sneaking into your room and suddenly you were taking my entire shaft like a pornstar. Your throat feels so good too... You're amazing...

Anyways, we... I **am** going to figure out... How to fix this. How to fix you. To get things back to normal, like before you became so thoroughly... Distractible.

For starters I'm going to try out something... I wanna see if there's a different, less addictive way to... Help you with this craving.

[Suddenly a little unsure.] Lose your pants bro and ummmmmm I have *this* bottle of lube?

(His eyes widen as he realises the plan. "Huh? But-but")

Mhm I knowwww you told me never to fuck your ass before, but that was weeks ago. And be honest, aren't you a little bit curious what it'll feel like to have this fat, warm thing  pounding into that cute butt?

And it might help you with your addiction to sucking it. Two birds, one stone?

('Well ummm I don't think that's... Um I mean I don't want-')

Yeah, well in a sec I'm gonna drop my track pants and if you *realllllly* object, just don't go drooling over the sight and I promise I won't fuck you.

Closing your eyes ey? That's a novel tactic bro.

God I am so hard though. All that reminiscing really got me going. I have been thinking about you a lot to be honest.

It sorta sticks out so straight and bounces. It's got weight to it. And the tip is so smooth isn't it? Mhmmm and it feels sooooo good on your tongue... If I was gonna describe it, it's like, heavy and... Perky? Mmmm gosh, there's sooo much precum already. I'm just gonna rub it over my big, hot, tip... Make it nice and shiny...

Uh ohhhh, bro, you're looking at it! Was it the precum? You'd better get back to looking away. Quick! Think about something innocent to clear your thoughts! Think abouttttt baseball! Think about your sister holding a big powerful bat in her hands, the way it bounces, how hefty it looks, how amazingly sexy I look holding it. Wait...

Mmm well I'm just going to start stroking it, feel free to look away at anytime though. Or you can kneel and get a closer look.

Yeah, mmm nothing wrong with kneeling. But if you’re going to look away, think abouttttt something else not sexual... Salads! Umm lettuces, dressing, oils to lubricate big sexy cucumbers and carrots... Fuck, that's so bad. Sometimes I wish I had a script that I could read before hand for these things. Surely then my metaphors would be mmmm better.

Think of something natural like... I dunno, squirming in your sister's lap, grinding your ass against her big fat cock... Or think about cumming your brains out as she pumps it into you. Her long, deep strokes, making you squeal and moan. Rewarding you with every inch of her as she uses you for her pleasure. Mmmm yeah, think about that. And you let me know when you look away, or want me to start trying this.

Mmmm it's so adorable the way your eyes follow it... Goddamn you're cute, and *really really* slutty. And I swear I really do mean it when I say I want to try this to see if this could help. I mean, obviously I have ulterior motives too, but that’s a big one.

(He frowns at your cock, trying to look away from it, 'I-I still can't really.... Look away. You're so big and sexy... Why can't I look away yet though?' He groans sadly as his eyes track your powerful shaft.)

It is totally ok and totally natural that you can't look away from it yet bro... Nothing to be ashamed of. Don't be stupid. They're still working out why these things do this to guys and some girls. It's amazing that you still try to resist my body. According to what I've read, most guys who get as far as you with a futa girl end up just wanting to be her sex pet.

You're amazing and I'm absolutely gonna help you make sure you can manage to look away eventually. But while you're still so adorably glued to me, we're going to try every solution I can think of. So unless you're still utterly determined not to... Can we try this?

(Sheepish, nervous and aroused... 'ok...')

Mmmm Good now get the lube and start rubbing it onto my cock.

You'll need a lotttt more than that, be very very generous... Good boy.

_____

**Part 2**

I gotta admit, it's been fun. I mean, I know It's been awful... Getting stuck with this thing after that flu... I was hating my body so much, I thought I'd never work up the courage to go outside again... And I know it's been really tough for you since we ummm... But we've kinda gotten along better I think? Despite that?

Maybe I'm just biased cause you've been kissing and sucking my cock whenever I tell you to... It definitely helps that halfway through every fight you end up giving me a sweet blowjob.

But even when we do fix this addiction thing.I promise I'll remember this. Where we are now.

I find that, now that I've had this break from hating your guts all the time... I- I really do kinda... Like you.

Kinda!

Maybe!

And if you tell anyone I said that I'll murder you!

Not in your sleep.

You'll be awake.

And in a pit of slowly rising acid. You'll be trying to climb out using the rope I'll throw you. Only to realise that the rope is made of scorpions.

Mmmm you're really good with your hands.

And the acid will be on fire.

Oooook there's a towel to clean your hands when you're done. And I think you were done lubing me up ages ago. Nnnnnnnow you're just having fun.

Hehehe, *nmmmph* your hands feel so good. But I didn't go through the trauma of asking the old judgemental lady at the drug store about buying lube so I could fuck your hands. God I was so embarrassed. She *definitely* didn't believe my excuse about door hinges...

Get over that towel and show me that butt bro! Now.

Mmmm yayyy. Honestly I keep expecting you to say no. Goddammmmmn you've got a cute butt.

\*thlap swap slap\* [Slapping your erection against his ass like a club and taking your time rubbing his hips]

... (he objects, and squirms. 'what're you... Doing?')

What's the matter, I can't enjoy the moment?

... ('Just hurry up, lets g-get it over with')

Noooo no, I'm going to drag this out *exactly* how long I want to. I have to get my own back for all the teasing over the years.

Besides, I'm just giving it a couple slaps. I'm not gonna take forever.

Can you feel how hard I am? How *heavy* it is?

\*Slap\*

You're always telling me how warm I am in your mouth... I'm soooo hot right now. hehehe, can you *feel* the heat sinking into this cute little ass? Mmm hehehe, soon the heat's not going to be the only thing sinking into it.

What *WAS* it you were saying before about how you'd never EVER want to try this? And now here you are half naked in front of your sister squirming and shivering back against the fat dick you lubricated.

And now, all **I** have to do, is- puuuuuuuuush - Whoops... Ahhh nope, thaaaat didn't work.

Jeepers, you're-you're kinda tight. I-I thought it'd be easier.

... (Nervous squirming, he tenses up.)

Um ok. Hey! Don't worry! I'll take it, as slow as I possibly can. And slow as you want. We can stop this anytime you want.

In the meantime all I need you to do, is relax and leave this stuff allllll up to me. Stay nice and steady. I'll line up again, grab your hips and... and gennnntly ease forward... Mmm thaaaat's it bro, stay still.

The way you're shivering... Is so... Cute.

Yeeeeah, good. Just relax. Don't worry, I got your hips, you don't have to push back or anything. Juuuuust lets take our time as I... gradually... drive... in.

Ah! Th-there we go. The tip is in!

[giddy innocent excitement!] Good... Frickin job bro!!!!

[Concern] Are-Are you ok?! Does it feel ok?? Should I pull out???

('... Just... Just give me- a bit- to adapt.')

SURE! Sure, t-take your time! Mmmm Ohhh-k. You're so brave. Mmmm ffffuck! I didn't think it was going to be this tight... And hot.

Hey, stayyyyy relaxed. Noooo tensing!

Mmm thaaat's right, just giving it time. An' I'll start moving when you're relaxed and ready...

Ready?

Ok, just stay still. It's my hands on your hips... slowly... Working... Forward.

Let me know if you EVER want me to pull back or out all the way ok? That'll be just fine.

Mmmm. OK, now ouuut... And back in a little...

Yeahhhhhhhhhh... Mmmm fuck this is good...

Stay... relaxed. And if you ever tense up-... Like that - I'll stop moving and give you- uhn- time to relax again... Thaaat's it.

Fuck yes bro. You look so fucking cute shivering on my dick. And ouuuut, and then... Back in. Take more of me.

You're doing so good. It feels amazing- I wanna go deeper. Relax more for me. I want you to take all of my fat shaft bro. I want to get in to the hilt and fuck you stupid. I wanna make you cum so hard while I take your ass... Yeahhhh, that's it, relax you cute little slut, just let me pump into you. Gradually... getting... deeper.

(Happy whimpers and gasps and sniffles as he listens to your words and quivers. Doing his absolute best to relax for you.)

Mmmm there you go, you've taken almost a quarter of me! Aren't you proud?

('A QUARTER? TH-THAT'S ONLY A QUAR-')

HA!

Ha-hahahahahaa I'm fucking with you. I'm fucking with you. It's like, a little over two thirds. You were panicking a little though weren't you?

("Youuuuuuu-uhn- you biiitch- ahhhh!")

Mmmm you can fight me about it later, after I've had a shower. For now, just moan.

("Uhnnnnnnn.")

You look so damn good impaled on my cock. You've taken sooo much of it on our first attempt. I'm so proud! I thought I'd have to train your ass for aaaaages to get this far! If it was even possible. Mmmm my brother is so talented, so good at relaxing onto his sister's big dick.

I'm gonna fuck you. I'm going to fuck you till you're a mewling, cumming mess. And I'm gonna *keep* fucking you till I'm hilting in this cute ass and I'm pumping you full of my cum.

Are you ready for that?

(Shaky... 'Y-yes please.' mewling as he relaxes, but then can't help but tense up as you go deeper.)

Hehe mmm I know you're excited, but-but no tensing, just relax and give your ass over. Still no moving, well you can push back a bit if you can. Yeahhhh just feel my hands digging into your hips... I'm gonna be pounding you soon.

('Uhhhhhn. you feel so... Bigggg.')

Well I am big aren't I? You knew that. But I guess in your ass you get to feel exactly how big.

Fuck you're cute. I-I think, even if this doesn't - Mmmm - Help with your addiction the first time- that's not to say it won't help the 2nd or 3rd right? Right. So... Mmmm if you like it, maybe, we could try this a-a lot more.

Oh fuuuuuck it feels good when I use longer strokes. You're adapting so well.

('Mmmm yessssss... ffffuck me m-more. So big.')

Mmm I love it when you mewl like that bro. Feeling good from being impaled on your sister's big dick?

('yesssssss... Y-yes...' He's moaning and quivering from the sensations as he somehow stays relaxed.)

\*Affectionate spank\*

('Ah!')

Good boy.

Deeper... Deeper. Mmmm stretching you out...

Almost... just a liiiiiittle further...

Mmmmm... [whispers:] mmm fuuuuuuck. Therrrrrre it is... You feel my hips against your ass? You've taken it all. And on your first try! I'm sooooo - uhn - proud.

Are-are you gonna cum soon?

('N-no. Not even mmmm close.' He tries to deny it, his competitive streak flaring up even as he can't stop his back from shivering.)

Ummmm um, yeah. M-me neither. I could, keep this up all day. But- wait, nnno tensing! Donnnn't... Just don't move for a sec. Let-let's just, get our breath. Uhnnn what an amazing feeling... Ssssstop squirming! Don't make me turn this car around...

(He giggles and groans as he squirms on your fat cock. Playfully messing with you on the edge of your orgasm.)

Ok... Fuckkkkk. I *told* you to keep still. Buttttt if you *really* wanna squirm that badly!

\*Spank\*

My brother's a dirty little slut

\*Slap\*

Trying to make me cum before him.

\*Slap\*

Like that's ever gonna- Uhhh! (\*gasping with joy, as if his attempts might actually work\*)

\*Slap\*

H-happen.

\*Slap\*

('AH!' Your long deep stroke smacking down his attempt to mess with you as his body quakes, and he slumps onto his elbows. 'Ah, ah ah ah...')

Ha! Mhm. That's more like it you teasing little idiot. Squ-Squeal for me.

\*Slap\*

Forgetting who's... In charge.

\*Slap\*

This is what you get- for fucking... Teasing.

\*Slap\*

\*Slap\*

\*Slap\*

Trying to make me... Cum first

\*Slap\*

\*Slap\*

Yeah, long... Deep strokes. Long rhythm...

\*Slap\*

So deep.

\*Slap\*

Good boy. Really feel it... Gonna make you cum those brains out-

\*Slap\*

Give it up. Give it over.

\*Slap\*

Mhmm. You're gonna cum for me bro. You're gonna be a good little slut and cum all over your sister's fat dick.

\*Slap\*

Yeah you are.

\*Slap\*

You're gonna cum. On my next thrust I'm gonna tell you to cum. And you're gonna cum. Like a little slut.

\*Slap\*

NOW CUM!

\*Slap\*

\*Slap\*

Yesssss! Yes! Fuck yes, that's it. Give it up. Cum on my big dick...

\*Slap\*

Oh fuck yes! Take it. I'm gonna fucking-

\*Slap\*

Ahhhhhh! Yessssssssssssss!

\*Slap\*

...

Mmmmmmm... Cumming... Fucking cumming- fuck... So much... So much... Oh god yes... Oh fuck yes...

('Uhhhhhhhhhhhhhn...' He can't tell up from down as his orgasm smashes through him. As you lean your weight on him through your own climax, his arms give out and he crashes to the floor beneath you.)

AH!

\*Slap\* \*Crash\*

Hahaha oh fuck... I wasn't expecting you to collapse like that, so I was leaning on you, a bit... bit harder than I should've. Hilted again. Are-are you ok? Sorry.

Mmmm can you feel me twitching inside you?

\*Whispers:\* I'm... still going. So much cum... You made me feel... So fucking good.

\*kiss\* I'm just gonna nibble your ear a little...

You're so fucking cute.

...

How's your craving for my cum going? Is it subsiding?

(He groans happily and nods.)

That's good to know. So maybe this CAN help.

Thankyou for letting me fuck you. Will you um... Will you ever want me to do it again?

(Breathless quivering brother nods as best he can...)

Yayyy. Ok well, when you can stand, come get in the shower with me. I'll let you fight me for teasing you before. And I'll make dinner for tonight. I kinda feel like you deserve a nice easy reward.

\*Groan as you get up.\*

Thankyou so much for putting up with me.

\*Door shuts\*