Your Sister Crystal Walks In

"Now ... should I do the same for you? As thanks?" Sarah wonders.

"I would love -" you begin before the sound of someone else interrupts.

"Oh? I didn't realise we were breaking in our brother today?"

It's your older sister, Crystal, who just walked in on you two. "Crystal!" Sarah jumps into her arms for a hug.

"Doug gave me a blowjob and I was just about to return the favor and -"

"Hang on now Sarah," Crystal stops her "why would you do that?"

"What do you mean?"

"You shouldn't put his dick in your mouth just because he did that for you..."

Sarah looks confused at this.

"You see Sarah, there is no position more natural for a boy than being on his knees in front of a woman. Pleasuring girlcocks is what they love the most in life, so you're doing him a favor by letting him suck you off, not the other way around," Crystal explains.

Sarah lights up with understanding and nods eagerly, eyeing you with a look you haven't seen on her before. It's a scary one, like that of a huntress about to jump her first prey. You wish Crystal would've just shut up.

"So... I should just put my dick in his mouth whenever I want, because it's always what he wants?" Sarah asks.

"Now you're getting it!" Crystal smiles, and pulls down her underwear to reveal her own, 12 inch, erect girlcock, "And of couse, as sisters we should share our boys, right?"

Frightened and nervous, you try to back away, but the wall is right behind you. Sarah walks up to you, gives you a look like you're her new toy and takes you by the hand. She easily drags you over to the waiting older sister (how did she get so strong?) who pushes you down on your knees.

Your youngest sister grabs the back of your head, keeping you still, as the older one positions her massive girlcock in front of you, pushing eagerly at your lips.

"Come on, open up and accept my sisterly love," she smirks.

The scent of your sister's cock is overwhelming you with arousal, and part of you really wants to taste it properly, but because you don't want them to think of you as just some personal boy toy you keep your lips as shut as you can.

"Why is he resisting?" Sarah looks a little annoyed.

You put your hand between your lips and Crystal's cock so you can explain your feelings to Sarah, but she removes your hand the second you open your mouth, leaving Crystal free to stuff it with her delicious dick. "There, that's better! Good Doug!" Sarah concludes.

That's when you cum, violently. Despite it all, is Crystal right? As a boy, is this bliss? A big, juicy girlcock in one's mouth, hard and pulsating as it leaks precum, going deeper and deeper down the throat as the fight against the gag reflex is slowly, but surely won? Even though they're your sisters? Even though they want to treat you like a cock sleeve and make you suck them off whenever it suits them?

Yes, definitely. Nothing has ever made you more aroused than the thought of being at the mercy of these two girls you love so much.

"See? That's confirmation that he loves this" Crystal says and pokes at your cum-filled pants with her foot. Sarah giggles in that adorable way she always does, and you stop resisting at last.

The final length of your sister's cock slides easily all the way down your throat. You feel her balls caress your cheek and your nose press up against her skin. It feels... natural. You moan in happiness, and so does Crystal.

After a while of staying like that, she pulls out halfway before thrusting back in, then out again. She takes it out far enough to let you take some breaths around her cock, and you smile up at her.

Sarah watches and cheers as Crystal continues to **** her cock all the way down your throat, over and over again. She clearly wants another turn after Crystal is done.

"H-here it comes!" Crystal finally gasps, and pulls out until only the cockhead is in your mouth. "Savor the taste, my little brother! Ooh!"

As her cum fills you up and overwhelms your tastebuds, you feel your cock eject its own, much smaller torrent into your already soaked pants.

You do as Crystal told you and move her seed around in your mouth, familiarizing yourself with its thickness, its texture, its wonderful taste. You can't wait to have this meal again.

"OK, my turn!" Sarah thrusts her cock into your cumfilled mouth without warning, but Crystal stops her. You should be allowed to swallow first.

As soon as you've gulped it down, your little sister's cock is back in. She is a little rougher than the older one at first, but eventually settles into a rythm that lets you relax (as far as that is possible under the circumstances) and enjoy being used like a cum dumpster by the sisters of your family. This time, Crystal is holding your head while Sarah enjoys herself.

When Sarah is just about to cum down your throat for the second time today, Crystal pulls your head back so you get another chance to taste it instead. There's a slight difference, but you feel that your younger sister's cum is just as juicy and delicious as your older sister's.

"We should have done this to you years ago, Dougie!" Crystal says, while lazily slapping her cock against your cheek as you swallow.

Yes, you think. Yes, they should have.