"Master? I think I need new clothes."
Dziari turned to find her apprentice wrapped only in a blanket. She sighed. "And what happened to your previous ones?"
"They ... tore." Eya scuffed the ground with the toe of a thankfully still booted foot. "I, uh, had a bit of an accident."
"With laundry?"
"...no." Eya was staring at the ground.
Dziari sighed again. "Then go put on your spares. I know you have some."
"I..." Eya glanced up at her beseechingly. "They... won't fit."
"They won't fit," Dziari repeated in disbelief. They'd fit yesterday, what had the girl done, lost an arm?
Eya nervously glanced to both sides before hesitantly parting the blanket. "See?" she whispered.
Dziari saw: a firmly rounded stomach and two swollen breasts. With a deep sigh she stepped over and palpitated Eya's stomach. Hard things, many of them, medium sized. "What got you full of eggs?"
"I don't know, actually," Eya said. "I was out hunting that verdbeast like you said and slept up in a tree and then I woke up, uh, like this."
Dziari leveled an unimpressed look at her. "And what type of tree did you choose?"
"One that was easy to climb?"
"Easy to climb for you or for the local monsters?"
Eya winced. "Um."
Dziari trailed a hand to one of Eya's breasts. They had not been small before, but now they were definitely large. Eya gasped as she groped one. A small droplet of milk beaded at Eya's nipple.
"That wasn't there before," Eya squeaked.
"I know," Dziari drily replied. She played with Eya's nipples for a moment before groping the large breasts once more. A few white droplets gathered; Dziari swiped one with her finger and taste-tested it. It didn't taste bitter or like any other obvious sign of monstrous corruption, which narrowed down the nature of the progeny to things that would not consume Eya from within.
"What should I do?" Eya blinked her teary eyes.
Dziari drummed her fingers against Eya's breast as she thought, enjoying the supple bounce. The girl couldn't do any work like this and running around town on errands in only a blanket and boots was inadvisable as well. "Go to your room," Dziari said. "I'll check on you later."
"Okay," Eya said. She wrapped the blanket around herself and waddled off.
Feeding and cleaning the pens of the wild-caught monsters waiting for a sale took up most of Dziari's day. She sent Eya some food and took a moment to read up on what could've caused her apprentice's condition. There were a few species of monster that laid eggs in women and lived in the region. Regardless of species, the young were highly valuable, as most women weren't stupid enough to get used as incubators and if they were, left the wilderness before a male monster could fertilize the eggs. Dziari read up on the common symptoms and headed over to Eya's room.
Eya answered on the first knock. Dziari pushed past her into the room and let Eya close the door.
"What happens now?" Eya asked.
"Let me see." Dziari parted the blanket covering Eya. Her stomach looked to be the same size as earlier, but her breasts had grown even more and had a slow trickle of milk flowing down from them.
Even before this incident, Dziari had been considering dismissing Eya for her incompetence. The twenty-something was pleasing to look at, though, so she'd given her more chances. After this, however... Dziari palmed a breast and felt a jolt of warmth in her groin at how firm it was. "The eggs need to be fertilized," she said. "Tomorrow you will go back to the forest. A male of the species will smell your breastmilk and come fertilize them. We'll sell the young after they're born."
Eya immediately perked up. "So I managed to be useful?"
"Yes," Dziari admitted. "Now, let's ensure you have enough milk production it'll be successful."
"How will we do- Oh!"
Dziari pinched a nipple and milk spurted out. "Get on the bed."
Eya obediently shuffled to her narrow bunk and removed her boots, leaving her naked. Her large tits spilled to the sides and trembled with her breath.
Lust stabbed through Dziari as she descended upon Eya's form. She grabbed a breast with both hands only to find it was large enough to spill over. Need took control of her as she squeezed hard and sucked Eya's nipple. Warm milk hit her tongue.
She manhandled Eya flat onto her back and kept sucking. Eya's surprised gasp gradually turned into moans and the girl bucked her hips to the air. Dziari didn't give her anything, just pinned one of her legs down with her own and groped Eya's other breast. They'd always been Eya's best quality, but now, massive and overfull with milk, they were irresistable.
Abruptly, Eya came with a gasp. Dziari was nowhere near done, but she took a moment to draw back and observe her bumbling former apprentice. Wet nether lips, a rounded stomach, large shaking breasts leaking milk in a steady stream, and a vacantly blissed-out expression. Dziari wanted to consume her whole.
The texts had warned that incubators would become dulled as the breasts grew with milk, what was left of their minds preoccupied with having their breasts played with and happily incubating ever more monster spawn. Eya had never had much of a head to begin with; she would find much more satisfaction in her new role than she'd ever had as Dziari's apprentice.
Dziari went back to sucking Eya's teat, intent on accelerating the transformation. She ground against Eya's hip and groped the voluptuous breasts, taking turns suckling each teat, until Eya's skin was as wet with her milk as Dziari's underwear was.
Eya's breasts, though emptied, didn't look like they'd shrunk. Dziari told Eya to clean herself up and left the room. She masturbated again in her own room, Eya's hazy expression and overlarge tits on her mind.
"Here," Dziari said once they'd reached the appropriate spot in the forest. She confiscated Eya's blanket. "I'll watch over you from a distance. Try to express some milk."
Eya nodded and played with her voluptuous breasts. They'd grown larger overnight and would grow even larger as her body prepared to feed the litter that would soon grow inside her.
By the time the first drops of milk had hit the ground, Dziari was halfway up a tree no monster would climb. The leafy fronds provided some cover for her presence but she managed to settle securely onto a branch that provided a good view of Eya just as the forest started trembling with a monster's approach.
A creature made solely of prehensile tentacles erupted out of the underbrush. Eya took a halting step back, but the monster was faster, grasping her with its tentacles and pulling her to it. A new tentacle emerged from the center of the knot and punched its way into Eya's vagina as two other tentacles attached themselves to her breasts, drinking the milk so no other male would smell it and know to compete to fertilize the eggs.
It would be in vain, of course – Eya's milk supply was excellent. Dziari stuffed a hand down her trousers as the monster held Eya suspended in the air and pummeled her as she moaned in pleasure. Her breasts flopped obscenely.
The forest trembled again as the monster's seed dripped down Eya's legs. Eya was set down on the forest floor as the monster faced down the newcomer. The two monsters tussled, tentacle against tentacle.
Eya lay on the ground, rubbing herself with one hand and palming her breasts with the other. So far gone already – Dziari would have fun with her in the evening.
The newcomer beat off the first monster and penetrated Eya. A pair of tentacles batted her hands out of the way to attach to her tits. She pushed them toward the monster, moaning loudly as it worked its inseminatory tentacle within her.
Dziari rubbed herself, mouth tight and silent in contrast to Eya's loud noises of pleasure. Eya, as the bearer of eggs, would not be harmed. Dziari was another matter entirely.
The forest wildlife had gone silent save for a buzz that heralded the arrival of yet another monster. Dziari came undone silently on her hand and settled in watch. She'd go for another round soon – and Eya's usage would fuel her masturbatory fantasies for decades to come.