With a quick burst of inspiration you devised a plan to give Jessica a way to produce her own version of your milk.
Jessica's little preteen twat disappeared as a mountain of flesh poured out from between her skinny legs. It quickly took its shape as a gargantuan 2' soft penis that was as thick as your arm. It laid heavily on the bed, coiled around lazily, resting atop a pair of smooth hairless cantaloupe-sized "milk"-makers.
You didn't know why you wanted to give her such an absurdly massive meat-stick, but it was funny to see your cute little sister having such a monstrous thick appendage.
Satisfied, you smiled. "Well, Jess, why don't you just have some of yours?"
Jessica looked down at her coiled trouser-snake, and excitement filled her eyes. "Oh yeah! haha! I'm an idiot!"
She immediately reached a small dainty hand down and gripped the shaft of her schlong just below the fat shiny head. She pulled the cockhead over to her, bringing most of the dickmeat along with it, until it was nestled between her fantastic tits.
She giggled as she stared at her huge piss slit before sliding her hands up and down her shaft, making her moan.
You were amazed as you watched her giant sleeping penis begin to wake up, and it gradually began slithering up Jessica's deep cleavage as it gained rigidity. It grew slightly thicker as well by the time it finished growing.
Your little sister's boner reached all the way up to her mouth, the fat heavy cockhead resting on her adolescent chin. It was exactly as long as you wanted it to be, and you were pleased as you saw Jessica open her mouth and stuff her cockhead into it.
She started letting out muffled moans as she stroked her meat while tonguing around her spongy head. You were surprised she was even able to fit the head into her mouth, as her piss slit alone was big enough for you to shove your dick into. Nevertheless, your sister slurped away at her horrifying gift while doing her best to work her nutjuice out of it.
You didn't even notice as your average cock grew hard once again from watching her fellate herself. Wanting to help her along, you gently placed a hand on each of her giant nuts and started rubbing the firm skin, as if you were some kind of nut-masseuse.
Suddenly, you heard a pitter-patter in the hall a moment before Tommy ran into the room.
"Dang it! I was too late!" he shouted, panting and defeated. "Once she gets going she could go for hours!"
"What do you mean?" you asked him.
"Her milk! I was wanting it so bad, I'm so hungry!"
"Well... what about her milk from her tits?"
"I don't want that, Ben! I'm a growing boy, I need protein!"
It was funny hearing your 10 year old brother say something like that. Somehow you knew he was really just repeating something your mom or dad told him in this reality. It was odd thinking of your parents encouraging your little brother to eat cum, but here you were.
"Well, Tommy, uhh... you could have some of mine, I guess," you offered.
Tommy gave you a big smile. "Really? Thanks, Ben! You're the best!"
He ran over to you as you stood up beside the bed.
You were going to just jack off and fire your ropes at his waiting mouth, like you did with your sister before, but Tommy beat you to it as he placed his lips at the tip of your dick.
"WHOA!" you exclaimed as Tommy swallowed your entire dick in one motion before hungrily slurping up and down on the manmeat. You were really impressed at his ability to suck cock, even at his young age. He didn't let out so much as a choke or gag as he took you to the balls over and over.
You were soon panting and grunting with each thrust of your member into Tommy's tight prepubescent throat, matched in volume only by the muffled moans of your sister attempting to milk herself for all she's worth.
"Fffffuck, Tommy," you groaned. You reached a hand up and stroked his hair while he bobbed his head up and down. In return, Tommy gave you a look of immense love, as if he didn't even want the cum anymore, instead just wanting to make you cum.
The scene was interrupted as your mom appeared in the doorway.
She took in the image of her youngest sucking the soul out of his older brother's cock, with her baby girl laying on her bed milking an absolute behemoth of a schlong. Instead of freaking out, she gave you all a playful smirk.
"I was wondering what all the racket was, but I should have known," she said with a chuckle.
She sashayed her way over to the side of Jessica's bed and sat down on the edge next to her well-hung shemale daughter. (Actually, "well-hung" doesn't even do it justice.)
She reached over and stroked her daughter's hair. "I'm so proud of you honey, your cock is getting really quite amazing!" She looked over at you. "You know, I took her to get her physical yesterday, and the doctor said when she's fully grown, her cock will be FIVE feet long and TEN inches wide!" She gave her daughter a proud smile before reaching down rubbing a hand on one of Jessica's giant nuts. "Not to mention these bad boys. Doctor said they'll be as big as watermelons!"
"Ah! W-wow," you managed to reply around the grunts from your blowjob.
In your horny stupor, you imagined your mom having the same gift as Jessica, and then some.
Not realizing your error before it was too late, the front of your mom's yoga pants stretched outward into a truly massive bulge. It looked like she was nine months pregnant, only between the legs. The fabric was stretched so thin, you could almost see through it.
Your mom smiled at you before standing up from the bed.
"Of course," she began, "even then, she won't be as big as her mommy." Your mom gripped the waistband of her bottoms and pulled them forward and downward. Instantly, the most monstrous dick you could have ever imagined peeked out of it. The head alone was the size of your actual head, and the shaft was as thick as your leg. The behemoth uncoiled itself and flopped out of your mom's bottoms, flinging downward until the huge purple head came to a stop just above the floor, now slowly swinging back and forth between your mom's ankles.
You realized her cock was still soft! It had to be over three feet long!
Your mom kept her balls inside her bottoms, however, so you couldn't quite estimate how huge they were. You figured her yoga pants must have acted as a sort of bra for them, making it easier for her to walk.
"Well, have fun you guys," your mom said before walking across to the doorway, her person-sized schlong swinging back and forth heavily.
She came to a stop in the doorway and turned around. "By the way, Ben, I'm ready to go if you want to have your cum bath, sweetie."
You were bewildered. "W-wha? Uh! Ah!" you grunted as Tommy brought you over the edge. Your mom just smiled at the sight of you orgasming into her youngest's mouth, and Tommy hungrily swallowing every drop.
After emptying your balls in him, Tommy slid your dick out of his mouth with a SCHLORP! and giggled.
"Thanks, bro! That was delicious!" he announced triumphantly.
"And Tommy," your mom said. "If you're still hungry, I'm sure your brother would let you share his cum bath with him if you asked."
"That would be awesome! Can I, Ben? Can I? Can I?"
You considered the prospect of bathing in your mom's cum. Surely there must be some health benefit to it now, as this reality has really been fucked around with. What did you want to do next?