You grinned devilishly.
"Do I ever!" you answered. You used your power on yourself, and felt your balls grow heavier as they expanded rapidly in front of you. They grew from the size of golf balls to apples to cantaloupes before settling at the size of prize-winning watermelons. Each giant nut slid off Jessica's torso until they rested on the bed on either side of her in your massive hairy sack. You groaned from the increase of hormones pumping into your body and your recently expended dick quickly regained rigidity.
To make access to your dick easier you gradually increased its length and thickness, savoring the feeling of it sliding up from within the embrace of your little sister's fantastic tits until it came to a stop resting its newly engorged fat purple head on her smiling lips.
Adding to your new genitals, you made your balls develop a constant endless supply of cum, and gave yourself the ability to cum on command as much or as long as you wanted.
"Well, if you want more, open wide," you told Jessica with a smirk.
She hungrily agreed and opened her mouth unnaturally wide to allow your big heavy cockhead to slide in. She used her preteen tongue to flick around the underside of the glans, waiting for your semen-stream to return.
Making use of your new orgasmic ability, all you had to do was think about cumming and suddenly your whole body tensed up. You cried out as your massive nads sent your seed barreling up the pipes until a gallon of spooge blasted into your little sister's mouth. Amazingly, she didn't let so much as a drop go to waste as she wrapped her lips around the head and gulped down every fluid ounce.
In the meantime, your mind was blown by the sensations of a climax from such an enormous dick, and just leaned your head back and closed your eyes. No matter how much you pumped into Jessica, she hungrily swallowed all of it.
You didn't even notice as ten minutes went by.
Twenty minutes.
Thirty.
After half an hour, you finally felt obligated to open your eyes again, and in your orgasmic stupor you looked back down at your little sister.
She wasn't so little anymore.
"Oh GOD!" you yelled as you manually stopped your otherwise-endless orgasm and jumped off your sister, making your fat cockhead pop out of her mouth.
As you landed on your feet at the side of her bed, Jessica let out a loud, long, guttural belch. Her new belly wobbled and churned from the vibrations of her animalistic emission. Finishing her belch, she giggled like a child.
You stared agape at the size of your sister. Her tits that once looked so beautifully big on her adolescent frame were now dwarfed in comparison to her belly.
Her midriff was larger than the rest of her body, and expanded past the foot of her bed as well as past either side of it. Beyond that, it stood four feet tall at its highest point, and you could see some veins under the smooth pale skin as the whole behemoth jiggled and sloshed audibly. Her belly button was now so large you could shove your head into it.
"I was wondering if you were gonna stop, bro," Jessica said, the rest of her body appearing unaltered. "My belly is so big, it feels like I'm about to burst, haha!"
The shock having abated, the perverse side of your mind returned. You just smiled at your sister before replying. "Oh I don't think so, Jess. I think you could fill up this entire room with no problem at all. And then some."
"Well, okay. Then climb on back up, I want to drink more of your yummy milk!"
"Haha! Maybe in a bit, I think we should take a break."
"Hmph. Fine."
You stepped up close to her gargantuan tummy and pressed your hands against it in wonder. You could hear your cum splashing around inside. Your sister groaned as your hands sunk into the over-stretched flesh. You chuckled and pulled your hands back, watching as the skin bulged back out to its previous shape.
"Mmmmmm, being this full makes me so horny!" Jessica cried out. She turned her head to you. "If we're gonna take a break, would you mind please getting me off, Ben? I'd do it myself but it'll take me all day to digest all your nut juice!"
You walked around to the foot of the bed and saw how your sister's enormous midsection just drooped over the edge, completely engulfing her legs and obscuring her vagina from access.
"Ummm, I don't think I can reach your pussy, Jess, not with this massive thing in the way, haha!" you told her.
"Well... I could roll over and lay on my belly on the floor... then you can fuck me or fist me from behind!"
You were impressed with her problem-solving.
You could let her do that... or you could just climb back onto her and fill her up until she's spilling into the hallway.
Or you could leave her stranded on her belly and potentially cumflate someone else.
Which do you choose?
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