Marble had been having a rough week, Maud went to visit Pinkie in Ponyville for the whole week so Marble was left without her favorite cock sock to fuck every night. She thought she would be fine going back to just masterbating in the shower, but after having a pussy to cum into every night it barely satisfied her anymore. Her balls felt backed up and she needed to pump her cum in a mare or she would go crazy. Thankfully Maud had come back that afternoon and she would finally be able to relieve herself tonight. Marble was so horny she forgot to check if it was one of Maud’s safe days, all she could think about was pushing her cock deep in Maud's pussy and filling her womb with cum.

Marbles cock was twitching as she looked down on Marble, her cock was drooling a constant stream of pre down the shaft. Marble had come a long way from where she started, from peaking in the door and jerking off to thoughts of her in the shower, to now pumping her womb full of cum whenever she felt like it. Now she was going to fill Mauds womb full of her cum, since she left her without one for a whole week. Marble grabbed Mauds ass and spread her legs, There was her pussy, wet and ready to embrace her cock and drain it of its cum. She grabbed her cock and started to rub it along her sisters wet pussy, coating the shaft in her juices. Marble wanted to savor the return of her sister, and her wonderful pussy.

After her shaft was coated in a layer of Maud’s juices she pulled back and placed the tip on her pussy, leaking pre all over her pussy. Slowly Marble started to push her mare splitting cock in her sleeping sister, it had only been a week but to Marble it felt like at least a month since she had felt such pleasure. Mauds pussy was clenching around her cock, pulling her closer and closer to her womb. Unknown to Marble since she hadn't checked the day, Maud’s pussy wanted to be bred. Weeks of having her womb filled with cum to no effect were about to be fixed, Maud was going to have her eggs fertilised by her futa sisters fat cock. Further and further Marble went in until she touched Mauds cervix, it was flexing around her cock head, trying to coax it to shoot out its thick cum deep into her womb.

Once Marbles cock bottomed out in Maud’s tight womb, she kept it there for a while, her pre cum flowing into mauds womb alone promised that Maud would be pregnant but Marble wasn't trying to do that, she just wanted to have her cock massaged by Maud’s needy pussy. It flexed and milked her cock, trying to coax the thick futa cum that would fill her up. She started to slowly pull herself out of the womb, then stopped when the tip was right inside the entrance. Marble then thrust fast and deep all the way back into Mauds womb, she felt Maud clench as she had her first orgasm because a thick futa cock was scraping the inside of her womb. Maud’s body had become a total futa slut, no stallion could compare to the way thick futa cock could ravage her womb, claim it as its own, and fill it with her cum. As Maud’s pussy flexed around her, Marble started pulling back and pumping into Maud’s womb again and again, pounding it with her fat flare. Then pulling back scraping her walls all the way, till she thrust back in again.

Mauds pussy kept clenching and cumming as Marble thrust into it, desperately trying to pleasure the delicious shaft using it. Any other mare aware of what was happening to her would be begging to be bred, to have her eggs fertilised by Marbles cock. Marble’s cock was like a drug that would make any mare she used, become addicted to being dominated by futa cock. Marble could feel her balls starting to churn, she could tell this was going to be the biggest load she had ever made, and it was going straight into Mauds womb. Marbles thrusts were getting shorter and shorter as she kept thrusting into Mauds womb, Mauds pussy still clenching and cumming around it. Finally Marble felt the cum rushing up her cock and slammed into her sister's womb.

It was like a dam breaking cum flooded into Mauds womb, drowning her eggs in thick futa cum. Marbles flare stopped any cum from escaping the cervix, but caused Mauds womb to expand. When Marble finished filling her sister, it looked like she had just eaten. Her stomach was distended a bit from all the cum she had pumped into her womb. Marble sat with her cock wedged in her sister's womb thinking that there was nothing like breeding a mare, she just wished she could find some more mares to share her cock with, especially since she couldn't use Maud when she was unsafe. Either way she had a womb she could breed almost every night with no repercussions, and a loving family. As she pulled her cock out of Maud she thought of her sister limestone and what she was doing tomorrow, her cock gave a subtle twitch that she wrote off as a post orgasm jerk.

Author's Note

Hey thanks for reading all this trash, this was the first story I wrote so it's probably my lowest quality one.