You didn't know if it was your new feminine hormones affecting you or if you were always this horny, but at the moment you wanted nothing more than to get fucked like a whore. You stared hungrily at your sister's fat cock as she played around with it, patiently attempting to bring it back to rigidity.
"Actually, sis," you began, "if it's not too much trouble, I would like you to fuck me."
Jenny beamed, "Okay, sure! Just give me a sec."
She settled finally on a channel on the tv, some stupid reality show with very plastic-looking women, before putting the remote down and beginning to fap her flaccid meat voraciously.
She actually took her attention away from the tv entirely, instead eyeing you up and down as she worked herself.
"Hey Ben, would you mind spreading your pussy open?" she asked.
"Oh uh, sure," you responded, before turning on the couch until your pussy was facing your older shemale sister. Copying what you had seen in porn, you opened your legs and reached one hand down to your dripping snatch. Using only your pointer and middle fingers, you spread your thick meaty lips to reveal to Jenny your dark inner folds.
"Oh yeahhhhh, that's the stuff," Jenny cooed, her dick apparently finally getting hard, both from her ministrations and the sight of your waiting fuckhole.
Jenny then stood up from the couch and turned to face you.
She opened her stance and said, "Ta-daaaaaaa," with jazz hands, simultaneously rotating her hips to make her respectable boner whip back and forth.
The two of you had a laugh.
Finishing her performance, Jenny gripped her dick in her right hand and stroked it a few times, evidently enjoying the sight of you presenting yourself to her.
Wasting no more time, Jenny climbed back onto the couch, this time on her knees, and moved toward you until she was straddling you from directly above. Her heavy cockhead rested against the entrance to your womb, and its every throb sent tiny tingles through your nethers.
You were resting your head against the armrest of the couch, flanked on either side by your sisters dainty feminine hands, which she was leaning on to keep herself upright as she prepared to initiate penetration.
You couldn't help but stare down your sister's tantalizing cleavage, revealed to you by her low-cut cotton tanktop. She wasn't wearing a bra.
If you still had a penis it would be so hard right now.
Jenny cocked her head as she spotted you looking down her shirt.
"What, you wanna see my tits?" she asked with a smirk.
"Yes please," you responded politely.
She gave you a big smile and leaned back until she was standing up on her knees. She crossed her arms over her top and gripped the underside of its hem that tightly clung to her toned abdomen. Effortlessly, she pulled upward, turning her top inside-out as she removed her last article of clothing. She threw her tanktop to the carpeted floor, allowing you to gaze upon her voluptuous breasts for the first time.
They were as amazing as you had dreamed they would be. Each perfect globe wobbled from the motions of her undressing. They were superbly perky, considering their size, jutting out from her chest probably farther than her dick was long. Each boob was capped with a large dark areola, tipped with thumb-sized nipples. You wanted to suck on them so bad, but were then distracted by the sight of Jenny's entire form.
She smiled widely as you gazed at her, and brought her hands up to squeeze her tits for your enjoyment. Her whole body was amazing. From gorgeous face, to massive tits, to slim perfect waist, to her incredible thighs and ass. And there, as icing on the cake, was her turgid penis, fully erect as it jutted out between her pillowy thighs.
You didn't even notice you had begun fingering yourself. You've had your vagina for no more than 10 minutes, and already it was second-nature to you. As amazing as Jenny's breasts were, you couldn't pull your eyes off her cock. You needed it so bad.
Jenny chuckled. "Alright, alright. Enough foreplay. I know you're just dying to feel me inside you."
She said it teasingly, but... she was completely correct.
Your older sister leaned back down into her prior position, bracing herself against the armrest over you, giving you an up-close look at her perfect athletic dickified body.
With no further ado, she leaned forward and you felt her cockhead penetrate you. The two of you moaned as her dick glided into your pussy, your enlarged snatch taking it with relative ease.
Jenny quickly hilted herself inside you.
"Fuck, Ben, your pussy fits me like a glove," she noted dreamily. She wasted no time in pulling back out before stopping just as the head was about to exit, then driving back into you more roughly.
It felt like there were fireworks going off in your head. Your whole body rippled with pleasure with each of your sister's thrusts. In no time, your sister was full-on fucking you, her hairless balls slapping against your perineum over and over.
You just lightly held both sides of Jenny's waist, watching her heavy boobs undulate like pendulums with every motion of her wide hips.
"Oh Jen, fuck me!" you moaned.
"Ah! Ah! Yeahhh," Jenny responded around pants. "You like getting fucked by your sister. You love her fat cock, huh?"
"Yes! Oh fuck yes!"
Your older sister grinned. She was sweating with exertion, using all her strength to drive her powerful hips at your helpless coochie.
"And I love fucking your pussy," she answered. "I love fucking you. In fact..."
She leaned down and met her lips with yours. You jumped a little in surprise, but then melted into the kiss. The two of you swirled your tongues around each other's, savoring the taste, savoring the sex.
Subconsciously, you noticed the pleasure you were receiving from each thrust of her penis was increasing, but you didn't know why. The sensation from your pussy seemed to be growing every passing second, as if it was being penetrated deeper, stretched wider, filled more completely.
Jenny must've been feeling it just as strongly as you, as she soon broke her kiss with you to announce her impending climax.
"I'm about to cum, little bro. I'm about to cum inside you."
"Yes, hah! Yes! Do it!"
Your sister gave you another wide smile before driving into you one last time, the hardest she had up to that point. She groaned loudly as her levee broke. You felt a growth of heat deep in your womb as your sister came, her semen spewing out and dousing every fold of inner flesh with her girl-seed.
The thought alone of being bred by your sister sent you over the edge as well, and you cried out like a girl as your clit sprayed your own juices.
The climaxes were significantly longer this time, and a deep corner of your mind was confused as to why. The majority of you, however, was overwhelmed with orgasm. After a full minute of cumming, you and your sister finally exhaled and relaxed.
"Holy shit, that was amazing," Jenny said, panting heavily.
You fared no better, beads of sweat trickling down your face. "Yeah, *huff* it sure was."
You and your sister shared another quick kiss before she stood herself back up on her knees. You couldn't help but moan as she started pulling her cock out of your vagina.
However, when you looked down, your eyes shot open wide.
So much for your prior commitment to give Jenny a realistic cock.
No wonder you were feeling such unimaginable pleasure, her dick was the size of a 2-liter!
The monstrous appendage glistened with your juices, displaying thick veins that wrapped around within the entire 13" length and 5" width. The fat spongy head was the size of a softball.
Speaking of balls, her testicles were the size of cantaloupes.
"Oh my GOD!" you exclaimed. "That was inside me!?"
Jenny giggled, bringing a comparatively tiny hand up to stroke her meat-monolith. "Yup! Hard to believe, isn't it? But you took it like a champ! I can always count on you to make my dick feel so good!"
Now you knew why you felt like you were filled like a jelly donut. Your megadicked sister just pumped probably GALLONS of spooge inside you.
You just now noticed your pregnant-looking belly as well.
What happens next?