"Pound that bubbly butt!"

As Sandy stated her intention, you couldn't help but feel a slight sinking sensation in your gut, but at the same time, it was hard to shake a feeling of anticipation. After all, the last few times Carla had used you, it hadn't felt too bad, and she had promised Sandy was even bigger. With that thought buzzing about your head, you glanced towards Sandy's crotch, and just as you expected, the bulge in her shorts was impossible to miss, her junk clearly outlined as it strained to break free from its denim prison.

With a smirk, Sandy quickly undoes and unzips her pants, letting them fall to the floor, and it's hard to suppress a gasp as her member springs forwards, bobbing in the air, totally erect. By your guess, from tip to base it measured about seventeen or maybe even eighteen inches long, and probably a good three inches thick to boot! Additionally, much like her younger sister's, Sandy's intimidating length was clearly uncircumcised, her foreskin sliding up and back as she slowly stroked herself while you marveled at her. However, the sound of her clearing her throat brings your eyes up to her face, her lips upturned in a bemused smirk.

"Yeah, I thought you'd like it. All the boys do. Though, they're usually a bit more subtle then you, hah. You just love cock, don't you? Big, hard, thick girl-cocks turn you on, don't they?" She asked, though it was pretty clear her questions were purely rhetorical. With each sentence Sandy takes a step closer, until you can practically feel her body pressed against yours. Before you can blink, you feel her hands grip your arms firmly, though not painfully, and gasp as her lips crash against yours, her tongue easily forcing itself into your mouth in your surprise.

The kiss seems to last for only a few moments, Sandy's tongue wrestling with, and easily overpowering, yours. The sensation of her warm, slippery organ grappling with yours leaves you shivering with arousal as her hands shift from your arms down to your hips, and her mouth pulls away from yours, a thin, silvery strand of saliva connecting you momentarily as she speaks, "Get ready slut. I can't wait any longer." Those few words are the only warning you get as you feel yourself being lifted off the ground, the sensation eliciting a surprised squeak from you.

Before you're even able to fully comprehend what's going on, the sensation of Carla's bed creaking under you, followed by Sandy's firm insistence that you turn onto your stomach, you suddenly find yourself in a very **** position. As you lay face-down on Carla's bed you feel Sandy adjusting herself, the bed's squeaking protests going unheeded as she comes to rest on top of you, her breasts brushing against your neck and upper back. "Ngh, hold still Dougie..." As she whispers to you, the feeling of her iron-hard member sliding between your butt cheeks, prodding at your tender rosebud. However, when you expect to feel her thrust into you, instead you just feel her prominent head grinding into you, not quite entering you.

"Beg." Sandy's demand echoes in your ears as she tease your aching asshole, and much to your surprise, you find yourself debating giving in. Only now that you've had a moment to rest and think do you realize you'd not only been anticipating the fucking you were about to receive, but you'd been excited about it. The fact that your stiff cock was busy grinding between the bed and your stomach only served to reinforce that. "I said, "beg", slut!" Sandy's sudden exclamation broke you from your reverie just in time to feel her take a fistful of your hair, and yank your head up, not too roughly, but still enough to hurt a little. With her stony features leaning down to stare at you, you swallow nervously, ready to try and appease her before she actually gets angry.

"Please, um... Please fuck me, Sandy." You mutter, lowering your eyes in embarrassment, your cheeks burning. Though you can't see her face, by the sound of her chuckling, as well as the increasing pressure on your backdoor, her approval is apparent. "Mm, good enough for now. Carly's gonna need to teach you how to beg like a proper sissy bitch, though. Ngh..." Then, without another word to you, the cock that was prodding your rear suddenly enters you in earnest, stabbing deep into your loosened butt. The only sound that escapes you in your surprise is a breathless gasp, your dick squirting some pre into the bedspread.

"Mm, nice. You've got a tight little cunt here, Dougie. Let's see if we can't change that." Sandy mercilessly plunges into your stretched hole, her thick, veiny penis opening you up even more than Carla's had. Within seconds she's already worked herself up to a lightning fast pace, her hips slamming into yours with enough **** to leave you feeling sore. The wet sound of flesh slapping against flesh fills the small room as the fucking begins in earnest, the feeling of eighteen inches of girlcock rapidly stretching your rectum again and again forcing you to groan in both pain and pleasure.

As you start to adjust to the ecstatic experience of having your anus pried open at such a blistering pace, your suddenly blindsided as your field of vision is filled by the tanned, toned stomach that can only belong to Carla, as well as her throbbing cock, which she's quite plainly busy stroking only inches from your face. "Didn't forget about me, did you, buttslut? Don't tell me just because you've got a dick inside you, your forgot about your girlfriend. Come on, open up and give my girl a kiss." As she taunts you, you feel her rock hard phallus slapping against your cheek, stinging slightly as she berates you. With a blush, you obediently open up for her, letting her slip the angry purple tip of her prick into your wet mouth.

Carla's cock has a distinctly salty taste to it, as well as a definite musky aroma that threatens to overpower your senses whenever she pulls out to rub her cock against your upturned face, clearly enjoying the demeaning act. At this point, any talking has ceased, instead replaced by the panting and gasping of the two sisters as they have their way with you, as well as your own moans and grunts mixed in. Sandy's cock plunders your ass ruthlessly, rubbing past your delicate prostate with each of her thrusts, almost sending you into convulsions from the sheer pleasure of it. As Carla thrusts the tip of her cock into your mouth once again, you feel yourself lose control, your cock twitching wildly as you cum.

It goes relatively unnoticed however, as at that same moment Sandy reaches her limit as well, apparently not too worried about holding back. Her cock throbs powerfully inside your abused anus, and the blossoming warmth within you confirms that she's planting her seed within you. She groans loudly and powerfully, her arms pinning you to the bed as she deposits a thick load inside of you. Carla isn't far behind her, spraying most of her thick, creamy cum onto your face as she masturbates herself furiously, though a fair amount of it does land in your open mouth.

As you lay pinned beneath Sandy, all three of you panting with exhaustion, you hear the muffled sound of the sisters speaking to each other, but unfortunately that's about all you can make out as your fatigue takes you, sending you drifting off into sleep. When you awake, however...