Hyperdimension Neptunia belongs to Compile Heart, Idea Factory, Sega and whomever else worked on it.
"Hey, Plutie!" Neptune cried out as she, Noire and Blanc entered the Basilicom. "We're back!"
"Welcome back, Neppy!" Plutia smiled as she sat on the floor with three squirming and wiggling bodies around her.
"Um, Plutia..." Noire spoke up as she looked at the scene. "There are... Tiny... Humans moving around you."
Neptune's eyes widened. "Woah! Plutie! When did you pop out these three kids?!" Neptune tried to remember how long human mothers were pregnant, but she was drawing a blank. 'Does the stork bring them? No, Compa said that pregnant mothers look really fat and have to push out the baby from inside their tummy, right?' So they had to pop out of the mother. 'Wait, do they burst out of the stomach? How does this work again?' For the life of her, she couldn't remember just HOW human babies were born.
Blanc had a bit of an annoyed look on her face. "I didn't smell the stench of a man the last time I was here." She didn't want to believe that Plutia was seeing a guy and had even had children with him. Part of her wondered what kind of guy could even handle Plutia when she was in HDD.
Plutia looked at the three other CPUs in confusion. "Eh? I didn't give birth to these three girls. They were orphans that were brought here."
"Oh, that makes a lot more sense then!" Neptune smiled happily. While Iris Heart loved to make innuendos and Neptune had to fend off the other CPU's advances more than once in the past few years since being accidentally warped to this world, she never thought Plutia would go and have children. 'Wait, can CPUs even have children? Do we do it the normal way or could we have babies with other CPUs? If we had children, would they age like normal humans or would they pop out fully grown? Wait, would they even come out of our tummies like normal babies or would they pop out of the Sharicite like Nep Jr. and I did?'
Neptune was dragged out of her thoughts as she heard some crying from the babies. "Huh? What's wrong?"
"Hungy!" The little baby with strawberry blonde hair pouted, tears in her eyes.
"Oh, don't worry." Plutia smiled and stood up. "I'll go get some milk right now."
Neptune smiled as she looked at the babies more closely. One had brown hair and green eyes, one had hair that was close to orange in color with matching eyes with the last baby having strawberry blonde hair and blue eyes. "You three are so cute."
"Yay! Koot!" The one with orange-like hair smiled cheerfully.
Neptune didn't know why, but the baby with the brown hair and the baby with the orange hair looked very familiar to her. Their faces were just so chubby and tiny and cute that she wanted to hug them tightly and never let go.
She held back, remembering how she almost squished the Mini-Histoire of this dimension by accident. It wasn't easy though.
It was fortunate that Neptune didn't try hugging and squeezing the babies in the same way. After all, the girl was stupidly strong and would have accidentally killed the babies.
"I'm back!" Plutia smiled as she came in with three bottles of milk.
"Yay!" The orange-haired baby smiled happily.
"Eh..." The brown haired baby didn't really want the bottles of milk, but she was hungry too!
"Boo!" The blonde baby pouted, much to Plutia's shock.
"What's wrong?" Plutia asked as she knelt down to look at the little baby. "Do you not want milk?"
"No moo moo." The baby continued to pout.
"What do you want then?" Plutia asked, knowing that little children often didn't know what they wanted.
"Boobie milk!" The baby suddenly cheered happily and threw her arms in the air.
"EH?!" Plutia's eyes went white and blank with white circles, as did Noire, Blanc and Neptune's eyes.
"She wants boobie milk?!" Neptune suddenly remembered a mother with a newborn that had been breastfeeding in the park that she had met just after she had become a CPU and explained things to her before pointing at Noire. "That means you, Noire! You got the biggest boobs here!" At least in human form, but she knew that if Plutia transformed that the kids would probably be traumatized.
Noire's face turned bright red. "H...Hey! I'm still a virgin!" She pointed at Blanc. "Besides, Blanc's the oldest one, she should do it!"
Glaring at the twin-tailed girl in the blue and black halter-top and miniskirt, Blanc shook her head. "That's not possible. I have no boobs to breastfeed with."
The blonde baby started to cry, which caused a chain reaction that caused the orange-haired baby to start crying, which caused the brown-haired baby to start getting fussy as well.
Neptune could see that Plutia was starting to panic, heck, she was starting to panic as the babies continued to cry. "If only Vert was here, her boobs are the biggest, surely she has a bunch of milk in them!"
"Wasn't she the one who got us out of prison?" Blanc asked, getting a nod from Neptune.
"Uh huh, if only..." Suddenly an idea came to Neptune, a weird, crazy and outright silly one. But it was the best idea she could come up with. "I got it!"
"Huh?" The other CPUs looked at Neptune in confusion as she picked up the blonde baby and carried her to the door.
"Neptune!" Noire called out. "You're not going to throw the baby out, are you?"
"Nep what?" Neptune had an utterly baffled look on her face. "No way! I'm just going to try something." A blush came to her face as she ran out of the room, leaving three confused CPUs behind.
"Um..." Plutia shook her head and tried to calm the other two babies down. "Here, have some yummy moo moo milk." She offered the orange haired baby a bottle. "Noire, can you give the other one a bottle?"
"Um, sure." Noire said, though she looked at the baby awkwardly while she tried to feed it. "I never had any little siblings, so I don't know if I'm doing it right." At least the brown-haired baby was sucking on the bottle and was quieting down.
Blanc sighed and felt the urge to slump down. "I wonder what Neptune's plan was."
"Knowing her, something rather stupid and she'll be back for the bottle in a moment." Noire commented, getting a smirk from Blanc.
"Well, at least she had an idea, which is more than you can say." Blanc shot back at her.
"What did you say, you old granny?" Noire turned her head to glare at the red-clad CPU.
"Will you two stop?" Plutia asked, her voice stern and her eyes showing some irritation. "You're upsetting the babies."
"Sorry!" Both Blanc and Noire said at the same time, but both knew that they would have their discussion at a later time...
...When they were alone and Plutia wasn't anywhere nearby.
It was three minutes later when the whole room shook.
"BUUUUUUURRRRRP!"
"What the heck was that?!" Both Noire and Blanc yelled at the same time in shock.
A few moments later, Purple Heart walked into the room, carrying a happy blonde baby in her arms, her face was slightly flush. "She's been fed."
"...How did..?" Noire asked as she saw the content look on the baby's face.
"Boobie milk! Boobie milk!" The baby giggled and kicked her legs.
Purple Heart's blush increased slightly. "...Shares have a wide variety of uses, you know."
Noire, Blanc and Plutia all gaped in shock, her eyes wide, blank and with black circles around them.
Purple Heart just hoped that she didn't need to repeat today.
Sadly, for her, she would later find that the other two babies, whom she would learn were IF and Compa, wanted her boobie milk as well.
At least they saved money not needing to buy formula for the babies.
So in Re;birth 3, there was a scene where Plutia tried to feed a baby Peashy (blonde baby), IF and Compa milk from a bottle and Peashy made a big stink about wanting boobie milk and then IF wanted some and Compa convinced them to go for moo moo milk. Neptune even comments that she wished Vert was there to help.
And, yes, Neptune's comment of "when did you pop 'em out", Noire's comment about "tiny humans" and Blanc's comment about "stench of a man" were all in the game.