Cum for sis (and sis)

"Erica...," you groan, not given much chance to react as your succubus sister plunges your cock to the hilt inside her furnace-fire pussy. She constricts tightly around you, securing your penis inside her as she fucks herself on your pole, squeezing your erection snuggly as its massaged by hundreds of wriggling, sensational feelers. A wet, warm tongue begins stimulating your swelled balls as a tail (your not sure if its Erica's or Stephanie's) ravages your bowels. And as the second tail squirms and sneaks in, it doesn't matter who it belongs to anymore, as you moan into Erica's offered breasts and suck her nipples.

Cum coats Erica's pussy, filling her sucking, absorbing womb as the succubus convulses on you, her vagina clamping hard on your squeezed penis to prevent a single drop from escaping her hellish folds. She screams in triumphant rapture as hot milk immediately floods your mouth, confirming her pregnancy. One of the tails fucking your ass speeds to a feverish pitch as Erica slams herself against your body, pulling cum from your balls and feeding on your life energy in her climax.

Dazed, you're barely aware as Erica is pulled away, twin sprays of milk dashing your already cum-strew face and chest, as Stephanie asserts herself on your cock. She's riding you reverse-cowgirl, looking over her slim shoulder and smiling deviously as you delving inside her pussy, sinking deeper and deeper, and impacting what feels like a small, open ring.

Your sister angles herself forward slightly, giving you a clear view of her firm ass and pristine asshole so that your cock slips up through her open cervix and is held inside her womb, "Let's do this in one shot again, right James?"

Too far gone to protest, you can only grunt your approval as Stephanie starts carefully rocking herself, making sure not to dislodge you from within her tight womb. The sensation is incredible; unbelievably tight and then into a slightly less tight spot filled with a thick, tingling liquid. Unlike the frantic, hard fucking from Erica, this is almost hypnotic. You feel relaxed, sleepy even, as Stephanie works your penis into her deepest depths, and by the time you cum directly inside her womb, you almost don't even realize its happening.

And then you cum again... and again... and again inside the nice, warm, tingly, cum-filling womb... You can't move, you can't even open your eyes anymore, you're just lying there, cumming, possibly forever, into your sister...

"Alright girls, that's enough," you hear from a world away. Waking up from whatever stupor Stephanie put you in, you watch as she begrudgingly removes herself, twin trails of milk slithering from her tits.

You mother leans over you, her violet eyes glinting with lust and desire, "Did you save any for me, baby?"