Incest is best

He holds her head down, feeling her begin to struggle he thinks she can manage just that little bit longer while his orgasm surges through his body. Just as his seed sprays the back of his sister's throat, someone tries the handle to the bathroom door.

"Hey! Ben, you in there?"
"Um...y,yeah...jus gimme a sec will ya?"
"What the hell you doin in there?"

Ben opens the door ajar to see his friend Duncan looking at him in a weird way. He's quite a big fella, a rugby forward on the school team but tall as well. Probably the biggest lad in Ben's year, and only his friends were allowed to call him doughnut (Duncan doughnut - dunkin doughnut,...geddit? Yeah, he doesn't think it's funny either) anybody else called him that got a flat and bloody nose.

"Well?" Duncan started to push open the door "I need to take a whizz."
"No! I mean, no...use the other one, this one's blocked."

Just then Janie coughed.

"Heyyy, you're hiding someone in there...who's there?"
"Look Duncan, it's Janie, she just got out the shower so could you give her some privacy huh?"
Duncan was just about to go downstairs when he suddenly twigged.
"So what the hell are you doing in there whilst yer sister's 'avin a shower?"
Duncan wasn't having any more of it, he needed the loo and he needed to know what was going on. He didn't need to use much of his weight to barge open the door to see Janie still on her knees, sucking cum off her fingers. He knew immediately what had been going on and got an instant boner.
"Look Dunc, you can't just barge in, leave my sis alone and," just then Ben noticed his huge erection through his pants "and...and"

Duncan closed the door behind him.
"...And I think there's a way to stop me tellin' your mum what she's been doing. And I think you know what I'm after Ben."

Duncan started unfastening his trousers, his erection begging to be set free.

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I heard Duncan's voice. I knew it was him, he came round often after practise to see my brother. I wasn't really listening to what he was saying, this cum tastes so good. Mmm, my brother's salty offering. Yum. Oh, something's got caught at the back of my throat.
*cough*
Oops.
I look up to see Duncan peering at me around the door, followed shortly by the rest of his body. He looked quite smart today in his usual school uniform. He actually had the school tie on too, I didn't know he owned one.
Oh...my...god. Look at the size of his..cock. It's huge.
I think I smile unvoluntarily as my brother catches me staring. He's wanting something, I'm not sure what....

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I can't believe my best friend is blackmailing me. Mind you, I can't blame him, Janie is hot, he's fancied her for a while. Maybe that's why he comes round after practise.
Geez, his erection is pretty damn big. I mean I've seen it in the showers, but never...hard. It's SO much bigger. Damn, Janie's got me staring at it too. Ugh!
I see him pull down his trousers, unready for the huge member that springs free, he's not even wearing undies!!

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Wow, look at the siiize of it. I scoot across the tiled floor, eye level with his cock, immediately holding it in both my hands, immediately it twitches and grows harder in my small palms.
Now I know what he wants...I'm more than willing to give.
I open my mouth and decide I can't quite get my jaw around so I stick my tongue out and trace his cock head, feeling its velvety surface and watching the first drop of precum form in the slit. I love that.
I make my lips form a small 'O' and gently suck on the end of his cock, still not able to get my mouth around. My hands working his shaft.
Kissing further down, licking, making his shaft wet and slick for my hands, I gently squeeze his oversized balls, getting him to squirm with my dextrous fingers. I love being in control.

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I can't believe I didn't even have to ask her. She just went right on over to him. She is indeed going to become a cock craving whore, but right now she is just curious. I mean, look at the way she holds him, still novice, but still oh so good! MMmmm. I grab onto my on shaft, hoping that some life comes back into it. I feel my sensitive end screaming for rest, but there is no rest for the wicked is there?
Groping myself a bit more surely now, I move it back and forth over my balls, creating whatever sensation I can without it hurting. Just watching her at work makes me want to fuck her.
I see her place her lips against his head as he throws his head back in pleasure. A slow groan emitting from him.
I step closer, eager to get a better view of her, rubbing him up and down, sucking on his head. Occasionally she just flicks her tongue out, spreading his precum over his head. Oh, she's going for it...yes! My sister just got him into her little mouth. That's my lil' sis! So proud of her!

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Whilst stroking Duncan, I see Ben play with himself. Does he never get tired? Out of the corner of my eye I carry on watching him. His hands never resting or staying still, constantly dancing over his cock. That lovely cock.
I start to concentrate on Duncan, his cum tasting different, but still good. I want to taste more, I want to feel him inside my mouth. I let my tongue dart out again, flicking over and around, kissing his head which is now slick with his own juice. I open my mouth, eager to try again and bingo. I slide right on over, though unable to move my tongue much.
I see my brother edging ever closer and I reach out with one hand and hold his shaft, still holding Duncan with the other and sucking him off.
My brother's cock isn't as hard as Duncan's, not yet anyway....

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Duncan still had his head thrown back, but he's now leaning against the tiled wall, unable to keep his balance standing up by himself. Janie grabs onto Ben, pulling him closer without having to tell him. He's mesmerised by this view before him, he can't seem to speak. Janie pulls her mouth back over Duncan's cock with a satisfying slurp, Ben's cock now only inches away she rubs Duncan's cock along her soft cheek whilst she puts her brother's cock in her mouth, still tasting the cum from their previous efforts. She smiles, wondering what Duncan's would taste like.
Duncan can't quite believe how good she is. His girlfriend could get some tips off this girl.
He felt himself being stroked against her face when he opened his eyes and saw her blowing her own brother.
He thought maybe he'd been spying on her, not getting BJ's off her!! Bloody hell! Duncan definitely has years of blackmailing ahead of him from this!
As she takes her brother's now firmly erect member out her mouth, she pushes them both together, licking them both simoultaneously, their cock heads sliding against each other giving them both unexpected pleasure.
Neither of them speak as they both pretend they didn't notice.

Janie stands up and turns around, exposing her red and waiting lips to both of them, she decided then and there that she needed another good fuck and she didn't care who from.