Dinky Hooves (Futa)/Amethyst Star/Incest/Foalcon/Impregnation/Futa/Cum inflation (just a little resubmit)

“Is it time to play?”

Amethyst Star sighed. “No, Dinky. In a few minutes. I just need to finish this up.”

Dinky frowned. She was lying on her bed, her back hooves kicking up in the air and her head on her front legs. “But I wanna play now!”

Amethyst groaned and stepped back from her desk. “If I play with you now, will you stop whining and let me finish up my work?”

Dinky leaped to her hooves. “Ooh! Yes!”

Amethyst found a grin creeping across her face despite herself. Admittedly, it wasn’t entirely out of sisterly love. Or perhaps it was, though out of a different “love” entirely.

Between little Dinky’s legs, a thick, meaty stallionhood was starting to emerge from its sheath. Her balls - easily twice the size of any stallion’s Amethyst had dated - hung low beneath her cute little ponut. But it wasn’t Dinky’s backdoor that Amethyst was interested in tonight, though it had been fun to imagine introducing her little sister to the finer parts of buttplugs. No. Tonight, if Amethyst Star was going to get rutted, she wanted to be filled up with cum until she was ready to pop - and it looked like little Dinky was more than willing to provide.

“Alright, squirt,” Amethyst said. She could already feel herself getting wet, and took a step toward the bed. It took only a second to remove her reading glasses and set them back down on the desk. It took only a second more to step toward the bed, and even less to eye Dinky’s dangling - though quickly hardening cock - and imagining it filling her up with Dinky’s spooge - her foals.

Amethyst licked her lips and slowly pushed Dinky onto her back. She swept her hooves up onto the bed and pursed her lips as she aligned her dripping pussy with Dinky’s throbbing horsecock. Dinky offered no complaints when Amethyst finally speared herself on her sister’s shaft, starting with just the shaft, but soon enough sliding down to the medial ring. Her legs spread even wider to allow Dinky’s massive member to pierce her fully.

Amethyst let out a long groan as her hips hit Dinky’s. She could feel her little sister’s cock inside of her, filling her up. Dinky looked more than happy to be used however her big sister wanted. Her little hooves waggled up in the air beneath Amethyst’s flank, and her tongue dangled out of her mouth.

“Oo-oh!” Amethyst grunted, feeling Dinky’s hips suddenly thrusting into her. She could feel her sister’s cock suddenly bulging up inside of her, could see its outline through her stomach. She slowly patted it in awe, wondering how she could ever stand to have been with another stallion when all she had ever wanted was right here at home.

She started going up and down on her own, alternating squeezing Dinky’s cock with her inner walls and massaging Dinky’s churning, full balls with her hooves. She could already feel spurts of precum inside of her, dripping down her walls, collecting over her clit, as Dinky’s cock swelled, throbbed, stretching her even farther -

It was like a dam breaking. Dinky might have had an enormous package, but she possessed almost no self-control. Amethyst gasped suddenly as she felt her sister’s orgasm coming on, rope after rope of thick, warm cum flooding into her pussy - and then breaking through, filling up her womb with Dinky’s seed.

Her belly started to swell outward as Dinky squirmed and thrusted beneath her, flooding her with more and more filly spooge. Amethyst soon found herself lost in daydreams of foals, her massive belly filling up with her and Dinky’s children. One for each pint - no, she thought, wincing as her belly started to droop over her hips - gallon of cum that her little sister was pumping into her.

Finally, Dinky stopped thrusting. Amethyst collapsed to the bed next to her sister, the two of them panting heavily. Amethyst lifted Dinky’s hoof and placed it on her fat, cum-filled belly. She could feel her sister’s spooge sloshing around inside of her, and imagined that cum fertilizing her, filling her up with foals kicking and growing inside of her.

“Y’feel that?” she murmured sleepily. “Those’re our foals.”

Dinky just cuddled up to her warm, squishy belly and smiled. “Mm.”

Amethyst just smiled back, letting her other hoof rest on her belly as some excess cum started to leak out of her and onto the bed. Maybe she wouldn’t be getting any more work done tonight...but would that really be so bad?