Mark was almost frozen in fear as the walls began to shake and expand, his balance weakened in due part of the slimy liquids secreting from the walls. He turned to the entrance, surprised to see his dad's erect cock rushing at him with precum dripping from its slit. Mark ran as fast as he could away from the dick that gave him life, but Jack's member was too fast for the young boy to outrun. The glans rammed into Mark's back, scooping him up from the floor of Marianna's pussy as it reached deeper and deeper into his mother. Eventually, the cock stopped with a thunderous slam, and Mark found himself launched into a conspicuous hole at the deepest part of his mother's vagina...
***
[Outside]
Marianna moaned louder as she felt Jack's penis fill her tunnel completely, arcing her back almost as if she was on the bring of her own orgasm already. She couldn't quite explain it, nor does she truly understand why, but Marianna felt a heavy, almost burning sensation in her pussy, causing her libido to skyrocket in exchange.
"Wow, it almost feels like you're cumming already," Jack comments. "Were you that needy for me?"
Marianna responded by pulling Jack closer to her, slamming her lips against his as she dominated over her husband's tongue with her own, moaning loudly as her hands trailed down her lover's back to his ass. "Shut up and fuck me hard," she commanded with heavy lust.
Jack grinned as his piston movement started up again, Marianna moaning harder from the start of their passionate love making.
***
[Inside Marianna's Womb]
Mark got up to inspect the place around him after being violently shoved into it. His eyes widened as he soon recognize this place to be his mother's womb, the same place Marianna nursed him the full 9 months since his conception. The murky scent of his mother filled his nose, possibly caused by her own horny needs being in the middle of satisfaction, and while he almost gagged at first, for some reason, Mark found himself almost... aroused by his own situation with the scent. He felt an uncomfortable feeling growing in his pants, and after some hesitation, he let drop his pants, allowing his own erect member to pop out into freedom.
The peaceful moment didn't last, as the womb began to shake violently once more. Mark was thrown onto the floor of the place, caught off guard by how soft the uterine lining was as his penis brushed against it, causing him to moan out in pleasure. The shakes began to increase in intensity as time went on, Marianna's heartbeat growing louder and faster from where Mark was trapped in. Alongside all of the shaking, Mark was getting tossed about, eventually ending up closer to one of the openings to his mom's Fallopian Tubes. Mark didn't know it at the time, but Marianna had just recently ovulated, which means his mother's egg was on its way down Mark's path.
Mark was too deep in both surprise and pleasure to notice this until suddenly, the shaking stopped. Marianna began to moan the loudest Mark has ever heard her moan, and a thunderous splash could be heard from beyond the cervix. Eventually, Mark swore he saw something emerge from the cervix, and after some hard squinting, saw Jack's sperm swimming towards him. But something was wrong, Mark noticed. There were very few spermatozoa emerging at once. If his dad ejaculated inside, and Marianna's egg was right here with him, then that would mean his parents were trying for yet another baby. Mark couldn't help but feel somewhat bad for them, and decided to help out the only way he could at this moment. He would have to fertilize Marianna's egg with his own cum.
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