Your mouths work in perfect harmony

Your eyes meet your sister's across the straining cockflesh as you kiss the sides of the bloated daemon's loathsome appendage. Your tongue darts out in the same moment as hers and together you cradle and stroke his daemonic prominence with your reaching tongue. His taste is foul and yet familiar, obscene and yet comforting, and your desire is only matched by your sister's.

"Mmmmmm," you moan, kissing your way down to his root.

"Mmmmmmm," she answers, following you and pressing her cheek to the door beside yours. Your hands share the task as your lips meet over his cock. You stroke him together, one hand each, and let your tongues intertwine and spread the sweet, oozing slime of his cock between you.

The ship shudders around you, as if the walls themselves are Bulgarmet bowing inward with pleasure as if raggedly sucking in breath.

"I wish he had stones to share," she whispers. "One for each of us."

"You know I crave the same. But we'll share his tip instead, our mouths together to swallow his oozing cock."

"Yes, and more of his sweet juice to taste," agrees your sister.

You kiss your ways back up his bulging root, to the bulbous cap and its narrowing at the very tip. It glistens with a sheen of his loin drippings and you and your sister gleefully smear your tongues through them, combing your mouth in a kiss that holds over his tip. Your hot mouths and tongues engulf him together, shared between you, lips meeting and tongues warring over his fiendish fuckflesh. The sweet taste of his precum coats your tongue and only adds to your desires.

You want him deeper in your mouth, gluttonous to have him to yourself, and you know your sister desires the same. But it wouldn't do well to hoard his monstrous member. You must share with your dear twin.

"I need more," you moan, "and so must you."

She nods. You kiss her and cradle her cheek, resisting the frenzied urge to suck him into your mouth.

"You take him first. Suck him, my beautiful twin. But do not allow his secretions to overtake your mind."

"You'll have your turn," she promises. Her eyes dance with delight as she turns her full attention to Bulgarmet cock. She presses a kiss to the very tip and begins to slide her lips open around him. She takes the whole head, like a ripe plum of daemonic flesh wriggling between her lips and she begins to suck more into her mouth. You almost gag sympathetically as you watch her take him to the limit of her throat. He is too big to handle much more and she pulls back and begins to slurp and bob her mouth on him.

"Oh, sister, that is a wonderful sight," you moan.

You begin to touch yourself with one hand while the other strokes Bulgarmet's fat cock into your sister's mouth. You kiss your twin's shoulder and her neck. You watch her devouring the daemon's swollen cock with something between jealousy and enjoyment. Your fingers slide into your aching cunt. You wish your were sucking him or that his cock was filling your needy pussy.

"Mmmmmmm!" Your sister reluctantly pulls her mouth from Bulgarmet's appendage. "It's so delicious, dear sister. You must have a taste."

She does not lie. You fill your mouth with the hot flesh of Bulgarmet's cock and immediately the taste and smell of him is overpowering. Any pain you might feel from overstretching your jaw is more than offset by the steady flow of intoxicating precum down your throat. You bob, faster and faster, your sister holding your hair from your face and watching with her fingers in her own pussy. She grows increasingly anxious and finally has to pull you from his cock again.

"My turn, sister! I need it!"

You reluctantly relinquish his cock to her mouth. You trade him back and forth this way, one of you always hovering nearby and watching and the other hungrily slurping on the cock shoved through the daemonic glory hole. Your mouth happens to be the one wrapped around Bulgarmet's cock as you feel it begin to stiffen and throb. You reluctantly pull your mouth away, grabbing him in your hands.

"He's cumming," you gasp.

You and your twin press your cheeks together and hold your mouths open wide and your tongues sticking out as your fingers slide over his greasy fuckmeat. It bucks in your fingers, twitching nad launching fat streams of almost scalding hot daemon cum into your open mouth, over your faces, onto your shoulders and into your matching crimson manes. You gulp what fills your mouth, crying out with ecstasy as you drink the salty-sweet tonic fresh from the fiendish pipe. It drenches you and your twin in cum, though she manages to catch a little more in her mouth.

Even as the flow of cum dwindles, your desire only grows.

"I need it," you cry, scooping his cum into your mouth.

"I need it more," moans your twin. She staggers to her feet, a cowl of cum dripping in gooey strands from her shoulders and over her breasts and back. She grabs Bulgarmet's still-hard root and turns around to press her ass against the door and rub the twitching tool against her groove.

"Sister," you cry out, feeling a surge of fear penetrate the intoxicating haze of daemonic cum. "Sister, be careful. We've pleasured him! You might damn yourself if you take his cock!"

"I need it!" she growls through clenched teeth and backs her pussy onto his member, stretching her folds and letting out a cry of lust as her ass flattens against the door. She impales herself again and again, pert breasts jiggling with each wild thrust as she throws back her head and wails with ecstasy.

You are not sure if this means she will be the one released or the one who becomes Bulgarmet's thrall. The one thing certain is that you are jealous of all the fun she is having.