Stepbrother With Benefits (7 page)

Even through the shock, Jack felt just a little bit of relief in the back of his mind... because if Mark was fucking Beth, then it was highly unlikely that he’d be fucking Ellie as well.

Although, that’s when another thought occurred: could this actually make it
more
likely?

Uh oh.

Beth moaned again, and Mark shushed her again. “I said keep it down...”

“Well then, work faster!” she replied in an emphatic whisper, bending over and kissing Mark heatedly on the lips. As Beth did this, the red-and-black blanket slid lower on her back, stopping just above the flare of her hips.

Jack could now see far more of what was going on, and the clarity only made his cock that much stiffer.

Beth’s arms were supporting her weight on Mark’s smooth and nearly hairless chest, her palms pressed below his well-defined pecs and her fingers toying with his little nipples. He, in turn, had a firm grip on Beth’s small breasts, his hands so large in comparison with her diminutive frame, that his fingers wrapped clear around her ribcage. The pale white skin of Beth’s back sparkled with beads of perspiration, with strands of her long, natural red hair clinging to the sticky sheen of wetness. The constant motion of the two lovers caused a few of the tiny sweat droplets to break free and merge into small rivulets, which in turn trickled down the groove of her spine, until disappearing somewhere under the blanket.

Breaking the kiss, Beth groaned loudly and rocked her crotch furiously, the slumping blanket dropping lower and lower... until it sagged enough to expose the delicious top of her ass crack. Mark reached around Beth’s back and yanked the blanket back up around her shoulders, but when he let go it slipped and fell into a heap across his knees, with gravity quickly pulling it all the way down to the floor.

He made a move to retrieve it, but Beth stopped him.

“No, just leave it,” she whispered, “I’m getting all sweaty anyways, and I don’t wanna hafta take another shower.”

Mark grunted in acknowledgement.

Although Beth and Mark appeared oblivious to Jack’s presence – never mind his present state of full consciousness – he nonetheless found himself trying to remain perfectly silent as he watched the naked teens intertwined in the act of lovemaking, barely daring to breath as his heart thumped excitedly in his ears.

From his reclined position he could see every graphic detail... and, although Jack knew that what he was doing was wrong, it was nonetheless impossible to look away from the sight of Mark’s obviously condom-free cock plowing in and out of Beth’s swollen pussy.

Jack found himself hypnotized by the motion of the band of vibrant pink skin surrounding the threshold of Beth sex; how tightly it gripped the shaft of Mark’s cock and was drawn out from her body as she moved upwards... only to be forced right back inside on the way down. The perfect round cheeks of Beth’s ass kept dimpling as her muscles twitched and clenched, while the puckered star of her anus pulsed larger and smaller as she impaled herself with an increasing sense of urgency.

Although Jack couldn’t keep his eyes off these sexy teens so freely enjoying themselves, and even though his own cock was throbbing something fierce in voyeuristic delight, he still felt horribly guilty for watching. Of course, Beth and Mark shouldn’t be doing anything out here in the first place – but more important than that, this was
their
apartment, and Jack didn’t have any right to spy on them.

No, as much as he hated the idea... the fun did have to end.

Attempting to inform the preoccupied lovers that they weren’t alone in the least embarrassing way possible, Jack pretended to wake up by coughing softly and shifting under the blanket.

Beth’s head twisted around to look in the direction of the noise... the steady humping of her ass never once faltering, even when she saw that her best friend’s brother was awake and watching them with wide eyes. Beth didn’t look surprised, embarrassed, or even a tiny bit self-conscious – she just continued energetically riding up and down and, if anything, added a little extra flourish to the roll of her hips.

“Oh, good morning, Jack,” she said calmly, her voice cracking higher whenever her crotch slammed down against Mark. “Sorry... we didn’t mean to wake you. Know you were up late. Ellie has a test to take this morning, and she turns into a real sourpuss if we get her up too early. Mark’s cheap mattress squeaks something horrible, and the walls here are so damn thin we’d be sure to wake up the whole floor if we fucked on that thing.”

Even though Jack was still a little groggy, that didn’t exactly sound like the best of excuses to him!

Mark peered around Beth’s heaving, sweaty body and waved at Jack cheerfully. The hair on his head was sticking up at odd angles from being slept on, and he hadn’t yet shaved off the patchy stubble of teenage beard growth. However, just like Beth, he didn’t seem the least bit uncomfortable about being nude or having Jack catch them in the midst of such an intimate act.

“Hey, Jack! Just takin’ care of some morning wood... be done in a jiffy.”

“Yeah, well, it’ll go a whole lot faster if you put a little effort into it yourself, ya know,” chastised Beth.

Jack had no idea what he could possibly say in response to the pair of blatant sexual exhibitionists, and simply stared at them with increasing incredulity. If the situation had been wrong before... it was doubly wrong now!

Gripping Beth’s hips, Mark began lifting her petite body almost clear off his cock and then dropping her hard on his lap – the slapping sounds of their sweaty skin echoing loudly off the living room walls. After a dozen or so of these violent maneuvers, Mark’s cock suddenly went in at a bad angle and bent sharply, slipping entirely from Beth’s pussy and springing up along the crack of her ass.

Beth giggled and leaned over to kiss Mark as the length of his cock twitched softly between her butt cheeks... sparkling with wetness in the first rays of morning sunlight.

Inside his head, Jack did a double take. Mark’s scrawny muscles may not have developed yet to match his mature skeleton, but his cock was definitely all grown up – and at least several inches longer than average. Although it did look a bit on the thinner side, the teen’s impressively oversized purple glans more than made up for that, with the head almost a third wider than the shaft. It reminded Jack of a candy apple on the end of a stick.

Sliding off Mark’s lap, Beth knelt on the floor and gripped the teen’s wet cock in one hand, bending over as she tried to wrap her lips around that bulbous glans. But it was so much larger than her open mouth, that she had to forcibly shove it past her lips! Beth then tried bobbing her head up and down, but the motion looked awkward, and she appeared incapable of getting more than the first few inches inside her mouth.

Pulling her mouth off with a wet popping sound, Beth turned and smiled at Jack. “Hey, you wanna see something real cool I just learned to do last week?”

Without waiting for an answer, Beth popped Mark’s cock back in her mouth and twisted her body, arching her back and aligning her neck with the angle of his erection. She then pushed steadily lower, working him further into her throat a fraction of an inch at a time.

Impossibly, her lips kept slipping lower and lower... until her cute, upturned nose finally hit Mark’s shaved pubic pad. Somehow, this petite girl had just managed to deep-throat his entire cock! She made a kind of self-impressed gurgling sound to announce her accomplishment, looking over at Jack with smiling eyes.

She was genuinely proud of being able to swallow Mark whole!

Mark groaned and ran his fingers through Beth’s long red hair as she tried moving her head up and down like before, although she really wasn’t capable of that and began choking almost immediately.

Quickly pulling off, Mark’s glans made a loud sucking sound as air squeezed past the vacuum of Beth’s lips.

“Cool, huh?” she asked, wiping the drool from around her mouth. “I learned how to do that from a video on the ’net.” Beth giggled as she thought of something. “I knew that interweb thing would prove useful for more than just boring old school research, am I right!”

Jack held back his own laugh... because he was afraid he might groan lustfully instead!

“Everything I needed to know, I learned from the internet,” quipped Mark.

Beth rolled her eyes. “Along with a hell of a lot of shit that no one should
ever
know! Anyways, I will say it feels real weird if Mark comes when we’re like that... kinda like I’m sipping hot chocolate, but I don’t even get any kinda taste.”

“I thought you said you didn’t like the taste of jizz.”

“I never said that! What I
said,
is if you’d change your diet to include less red meat, then your cum would taste
better.”

“...And that matters because?”

“Don’t be so obtuse, Mark. You do want girls to want to swallow that shit, right?”

As the oldest and clearly most uncomfortable one in the apartment, Jack was by now feeling the compulsion to say something... responsible. “Uh, guys, you sure you don’t want to take that somewhere more private?”

Standing up, Beth rotated around and glanced at Jack with a goofy grin on her face. Even with that ridiculous expression, she still managed to look amazingly hot – small breasts proud and perky, porcelain white body soft and beautiful, and with that shock of long red hair cascading all around her shoulders.

“Why would we want to do that, Jack? We’re here now, and knowing Mark’s quick trigger... I don’t think we’ll be much longer.”

Mark grunted with annoyance and slapped Beth firmly across both buttocks, making the girl screech and jump. “Hey, no insulting the talent, babe!”

“You call that talent?” replied Beth, waving her hand disparagingly towards his otherwise impressive-looking phallus. “Three-quarters of the time you get off before me, and I end up having to finish by myself!”

“Just get that tight little cunt of yours back on here and we’ll see about that.”

Beth snorted. “Oh, gee. You always know what to say to make a girl weak in the knees... not!”

Backing herself between Mark’s spread legs in a reverse cowgirl position, Beth positioned her pussy above his crotch and grabbed his cock, rubbing it back and forth along her slit and slapping the purple head repeatedly against her clit. Finally, she held it straight and lined herself up, then eased down until she bottomed out with a grunt.

Although Jack had already seen the two teens coupled from the rear, it continued to fascinate him how such a tiny girl could so easily take that huge prick – watching Mark slip inside, he had to be penetrating past her navel! As Beth resumed bouncing up and down, Jack’s own erection grew hard enough that it began to hurt with every beat of his heart; like pulsing twinges of pain that pleaded for his immediate attention. However, Jack refused to give in and touch himself, since he didn’t want to do anything he might end up regretting.

“Ah fuck, Mark... if there’s any talent to be had, it’s with your parents for making
you
in the first place!”

“Thanks babe, that’s really sweet. But I still had to teach myself how to use what my mamma gave me.”

“Oh, right!” laughed Beth. “Insert tab A into slot A is not much of a skill set.”

“But babe, your slot A is so very tiny, and you won’t even let me try slot B.”

“And you won’t ever get to at this rate. But enough already – just fuck me, ’cuz I need to get off before class!”

Spreading her knees and leaning forwards, Beth rocked her hips as she humped against Mark in short, rapid motions. Mark reached under her arms and cupped her breasts, his large hands squeezing and playing with the little swells as though they were stress toys – tweaking her long nipples between his fingertips so forcefully, that the once tender pink skin quickly turned an angry shade of red.

Although Jack was by now unbearably aroused and enjoying every second of the amateur sex show, he nonetheless felt deeply self-conscious about the circumstance. He wasn’t exactly used to seeing this sort of thing live and in person, and figured he shouldn’t be absorbing such intimate knowledge of a girl he’d known when she was in grade school.

Regretfully forcing himself to turn away, Jack tried looking out the window to distract himself with more mundane thoughts.

Was it going to snow again today? He’d forgotten to check the weather report last night. It looked like it was going to be a clear morning, but he knew that could change at the drop of a hat.

Beth must have noticed his shift in attitude. “You know, Jack...” she coaxed in a soothing tone, “we really don’t mind if you watch. We like being open with each other around here.”

Warily turning back to the couple, Jack found Beth leaning forwards and staring straight right at him – her hooded eyes barely two feet away from his own. He felt his face instantly flush hot, both from the uncomfortable proximity, and her rather seductive expression. “You two really should be doing that in private,” he murmured.

“Oh, we’re all totally used to doin’ it in front of everyone by now... so there’s nothing to hide. It’s totally freeing. And besides, you’re Ellie’s big brother, so you’re just like family!”