Orally

"I want a blowjob," Sam says without a second thought as he undid his pants and dropped them down and out of the way.

As soon as his cock was freed from its constraints, you didn't waste a second. Dropping to your knees eagerly, you leaned in, and engulfed him in yourwarm, wet mouth, reveling in the taste of his pre-cum on your tongue. Sam groaned, bucking his hips forward, and Zoe giggled with delight at the sight of her sister on their knees before him.

You dove into the blowjob with abandon, taking as much of his length into your mouth as she could, your cheeks hollowing with each bob of your head. Sam's hands found their way into your hair, gently guiding the pace. It was clear he was enjoying every second of it, his moans growing louder by the second.

Zoe, not one to be outdone, straddled Sam's lap, her kisses leaving a trail of fire down his neck and onto his chest. Her hand reached down to tease his balls, massaging them gently, which only served to further inflame his passion.

You felt Sam's cock twitch in her mouth, an unfamiliar feeling but you recognized it anyway. In that moment, he pulled you off his cock, gasping for air. "I'm gonna cum," he warned, his eyes wild with lust.

Without a moment's hesitation, you leaned in, mouth open wide, ready to catch every last drop. But before he came, he jumped up, picked you up and flipped you upside down on the side of the futon, your head hanging off the end upside down as he lined his cock back up with your mouth before plunged in all the way until you feel your nose buried in his ball sack. Right as he reached the back of your throat, his cock began pulsing and cum began pouring out straight down your throat as you struggle to keep from ****.

As you gagged and choked, trying your best not to vomit, your eyes watered and tears streamed down your cheeks. You could feel Sam's cock throbbing inside your mouth, flooding your throat with his thick, salty cum. The overwhelming sensation of having your head at such an unnatural angle while his cock relentlessly pumped away was too much to handle.

Just when you thought you couldn't take another drop, it finally stopped. Sam slowly pulled out, and you gasped for air, your lungs **** for oxygen. Your chest heaved as you coughed, spewing out a mix of saliva and cum onto the floor. Humiliation washed over you, but at the same time, an odd sense of accomplishment for taking the whole thing.

As you start to sit up, Sam pulls your shoulders down as he says, “That was just a warm up. Now I’m going to fuck your face.” He leans back in, his cock not softening at all as he shoves the entire length in again and begins to pummel your throat as hard and fast as he could, while he used your tits as hand holds to help him thrust harder.

The sensation of Sam's cock slamming into your mouth again was almost too much to bear. Your head spun from the inverted position, and your throat ached from the relentless pounding. A mixture of saliva and cum dripped down your chin, adding to the pool on the floor. Humiliation mingled with an odd sense of pride as you struggled to take every inch of him.

Your eyes watered as Sam manhandled and groped your chest, pumping himself in and out of your mouth with a fervor you never knew existed. You could feel your nose pressed against his pubic hair, the musky scent of sweat and arousal filling your nostrils. Your gag reflex flared up again and again, but you fought it back, determined not to disappoint either him or your sister.

Zoe, for her part, had moved to the side, Your phone in hand. You could only assume she was recording the whole thing. The thought of your sister watching you being used so roughly should have incensed you, but instead, it sent a shiver down your spine in excitement. The idea that this would be a moment captured forever, evidence of your complete submission to their lust, was strangely arousing.

As Sam continued to pound your face, your body betrayed you. Your own arousal peaked, and you felt an orgasm starting to build deep inside you. It felt embarrassing to cum without any direct stimulation, but the humiliation and the sheer lustful abandon with which Sam used your body proved to be too much to bear. Your walls clenched around nothing, your juices flowing freely, soaking the yoga pants Zoe had lent you.

As you came, Sam pulled out and began squirting his semen all over your face and upper chest, leaving a mess of cum everywhere he pointed. As your waves of orgasm finished, Sam stepped away with a deep sigh and said, "Fuck Zoe, that might be the best birthday present I've ever gotten."

With a big smile, Zoe stepped over and began lapping his cum up off your chest, paying special attention to your sensitive nipples. You shuddered with each caress of her tongue.