Deciding you would combine your sister with your penis, you grinned and closed your eyes to focus.
Concentrating, suddenly you felt the hem of your pajama bottoms stretch forward as your dick rapidly expanded outward and thickened, radically changing in appearance until it settled on something comparatively massive while also familiar.
Opening your eyes, you saw that your sister was no longer sitting on the couch, but instead saw her full-size upper body jutting out from between your legs.
Your sister was now topless, and you noticed from examining her back that her skin was now slightly translucent, allowing you to see thick veins as they webbed around inside her. Her hair was now tied up in a bun, and looking down to her base, you saw her skin fade into being more like the thicker skin at the base of a cock before she merged seamlessly into your groin. The region around her entire base was covered in dark pubic hair. You then noticed your balls were absolutely massive, obviously the location where the mass of her lower body had been relocated as they swung past your knees, almost grazing the ground.
You shifted a bit, which caused your sister's superb tits to sway, suddenly unleashing a slew of foreign pleasurable sensations making you moan.
Just like a dick, every inch of Jenny was now pleasurable at the touch. Back, arms, fingers, tits, mouth, nose, all felt amazing. You could even feel slight pleasure from the action of her eyes looking around.
Your sister cupped her tits in her hands, making the two of you moan.
"Oh, Ben, our balls are so full, can you please jack me off," she pleaded. She then gargled on some precum that had made its way into her mouth.
"Uhh, sure sis," you replied.
You waddled your way over to the couch, trying not to groan from the feeling of your penile sister swaying back and forth with each step, and managed to sit down. Your gargantuan nuts rested on the floor, and your sister continued to grope her tits as you brought your hands to her back.
Sliding your hands across the sensitive skin made the two of you coo, and your sister began to lose the battle with your precum as it started dribbling out of her mouth.
You then gripped both sides of her waist with your hands and slid them up and down her sides in an attempt to resemble normal stroking. The sensation was a hundred times stronger than with your old member, and you gasped when your sister decided to pinch her nipples, sending shockwaves up and down your new Jennydick.
As you squeezed her sides, you noticed your sister actually didn't have a ribcage anymore, or any bones at all for that matter, and yet managed to maintain her normal form. She was now amazingly pliable, probably enabling her to compressed to fit into... some kind of orifice.
It was then your mom strolled into the living room.
"Hey you two," she greeted with a smile. "Rubbing one out already?"
"Hey mom!" Jenny managed to reply around the copious stream of pre. "Yeah, my balls are just glblglb SO full of cum right now, haha."
"Well, you two have fun, then," your mom responded happily. "Also I made some breakfast if you're hungry, Ben."
"Oh, uh, thanks mom," you answered, noticing your mom specifically didn't address your sister when it concerned food.
You suddenly realized your mom being here presented an excellent opportunity. You were so horny from your oversexed sister groping her dick-tits, and it was filling you with a need to add your mom to this perverse scene.
But how?
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