Futas always think with their cocks

Felicity didn't want to fuck her sister. She didn't want to use her new cock. She didn't want to plunge her hard, bobbing, aching shaft into Bianca's wet cunt and rut her until hot cum poured into her slutty quim. She certainly didn't want to be grabbing her sister's warm, fat thigh and lining herself up with the younger girl's heavily gushing slit.

Wholly unprepared for the sanity-consuming pleasure that hit her, Felicity couldn't do anything but scream as she came the moment she penetrated her sister's pussy. Bianca laughed wildly, in joy and orgasm, as her older sister completely lost control and started fucking her relentlessly, each thrust accompanied by a matching jet of semen into her depths. The manic joy of being filled by her corrupted sister brought on Bianca's own orgasm, her laughing mixed with her own cries of pleasure as her own powerful dick sprayed cum on the bed.

Bianca's first orgasm had certainly been incredible for her, but it was nothing compared to Felicity's. The young woman couldn't stop cumming, each thrust sparking her pleasure anew before the feeling of the last one could fade. Not even the emptying of her balls could save her, the virus inside her ceaselessly generating fresh loads to be ejected into her sister.

Still, neither woman really cared, their screams melding together into a two person symphony of pleasure. Their bodies remained locked together, neither of their muscles able to do anything that wasn't directly related to cumming. Both of them lost track of time in the face of their never ending discharge of lust and cum.

Finally, even the nearly bottomless well of energy in their bodies ran dry, leaving the siblings unable to cum anymore. They collapsed onto the cum-drenched bed, wet squishes coming from the soaked mattress. Bianca's cum stuffed belly, stretched out by the sheer volume contained within, slowly deflated as several hundred of her older sister's loads poured out her utterly ravaged hole. Despite their inability to cum anymore, both futas remained hard, ready to fuck even after all they had done. Both girls absently noticed that they had both grown while they fucked, both of them measuring in at well over a foot long.

"Soooo. Gooooood," Felicity moaned with a voice hoarse from screaming. Bianca didn't say anything, but a fresh gush of semen poured from her pussy as the muscles inside contracted with orgasmic aftershocks. "I wanna get fucked," she said, her mind still fixed on sex.

"Go f-find a cock to stu-stuff you then. T-there should be so-uuhh-me somewhere in this place," Bianca said, trying to lift herself out of the bed, only succeeding on the third attempt. The younger futa stumbled towards the door, her legs not working properly for a moment before she remembered how to walk without being bowlegged. "I'm going to go find some stud to fill me up and hope he turns into a busty futa whore like us." Without further ado, Bianca walked out the door, heedless of leaving the door open behind her and the cum that continued to run down her legs in her search for male dick.

Felicity stayed on the bed for a while longer, looking out the open door and into the white hallway. She could feel her new testicles filling back up, readying more cum for her next orgasm. Out of curiosity, she scooped up a thick dollop of either her own or her sister's jizz and popped it into her mouth, humming happily at the divine taste. Her old self resisted it, but she couldn't deny that she wanted to do the same thing as her sister. Find one of the men in the bunker, preferably a younger one, and invite him to screw her brains out.

Burning with desire once again, Felicity shakily stood up and walked out into the hallway, looking around for someone to fuck her. She could hear moans and shouts coming from the direction her sister had gone in, so she decided to head the other way and try her luck. With cock throbbing in front of her and her massive tits and ass bouncing, she wandered the hallways, hoping she would find someone with a functional phallus.