She's not concerned and has something else in mind

"I don't think so, cuz. You don't know this, but I just love to tease people on the edge of cumming. Trent is still fun, but he looks forward to it now. I think I gave him an edging fetish. But you've got a tasty cock here and no idea how to use it. So why don't you let your older cousin show you how it's done." Heather stared at her cousin with surprise and fear before the hand on her dick tightened and started languidly stroking her.

"Ahhhh, no, why are...mmmmm oh...."

"I told you," Jenny said, watching her cousin's screwed up face intently, reveling in every bit of unwanted pleasure on the other girl's face. "My husband just can't compare to a sexy, thick young woman with a barely used cock. How many times have you cum with it?"

"T-three," Heather squeaked out, knees almost buckling as her cousin's thumb brushed over her sensitive head.

"Oh, you really have no idea what you're doing then, do you? Don't worry, Heather, I'll take good care of you. You'll cum like never before." A malicious glint shone in her eye as she tightened her grip again, shaking the hard shaft in her hand. "Eventually."

The taller brunette's eyes widened momentarily before slamming shut again as her cousin's hand picked up speed. Heavy, gurgling noises flowed out of her throat. Despite having cum repeatedly, Heather could feel another load swiftly building in her balls. Still entirely unused to having a cock, she couldn't stop her litany of moans any more than she could hold back the approaching flood of her cum. The only thing she knew with certainty about her new appendage was what the point of no return felt like. A feeling that was quickly mounting inside her.

"Oh, I know that face...getting close, are we?" Jenny asked, her own breathing picking up as she flushed. She quickly shrugged off her shirt and skirt, the hand not attending to Heather's rapidly twitching penis disappearing into her panties to finger the gushing slit covered by them. "I love that look, you were right there, weren't you? Right on the edge. Well get used to it, you're not cumming until I do."

"Ungh, no...please...I need to..."

"I thought you didn't want to cum," Jenny cooed to the taller girl, reveling in the other woman's face mired in the agony of denial. Her blood pumped harder, her fingers tearing her remaining underwear away before returning to their frantic pace against her sopping quim. She slowly sank to her knees, first resting her eyes on her younger family member's entirely gigantic and magnificent mammaries. Next was her fluttering midsection, the muscles shuddering under the strain of keeping her upright and reeling from sitting on the edge of orgasm. Finally, Jenny's breath caressed her dick, so much longer, thicker, and more powerful than any she had ever seen before.

From her new position, she repeatedly coaxed Heather up to the brink of cumming before letting her cool down just a little. She kept the begging futa there for minutes on end, watching and reveling in the tortured expressions that decorated her face.

Unable to help herself, Jenny stretched her tongue out and gently ran it down the length of the futa dick. Heather's skin tasted incredible, and the dribbles of precum that were leaking down it were even better. The girl's shaft throbbed hard as Jenny's hand languidly moved down to cup her balls, squeezing them lightly. Both girls could feel the testicles swelling with unspent seed, the delicate organs aching for release. Already incredibly sensitive, Heather couldn't stop her pleasure from slipping over her stopping point, her testes tightening as her mind caved.

"It's coming, I can't stop, it's gonna..." Heather gasped out through the crushing build of her orgasm.

"Yes, let it out, cover me with your filthy seed." Jenny continued her tonguing and light squeezing, feeling first hand as cum flowed out of them.

"It's coming, it's...ooooooOOOOOOHHHHHHHHH FUUUCK!!! I'M CUMMING!!!" Heather screamed her orgasm to the ceiling as long ropes of jizz exploded out of her dick, shooting into the air before falling back down onto the two women. Jenny's face melted into her own ecstasy as the raw taste and feeling of the cum hit her, instantly overwhelming her and rapidly changing her body.

She could acutely feel a bulge forming at the front of her vagina as her own cock pushed out of her body, two heavy orbs popping out to join the rapidly growing shaft. Her butt, already a delightful handful, wobbled as it pushed out, her upper legs and abs joining it as muscles were strengthened and hidden under a drool worthy layer of fat. Her breasts quickly followed, growing in small bursts as they jumped up cup sizes. She rapidly worked her way through C, D, E, and F until she couldn't keep track of the sizes anymore. Her new cock, matching the one she was still licking as it fired all over her, expelled its own load, painting the floor behind Heather with more creamy spunk.

Finally, the two futas orgasmic bliss abated and they both collapsed into the mixing mess of their joint seed, the warm fluid spreading across their perfect, porn-built bodies. Once she managed to regain some semblance of coherent thought, Jenny slid her hand in between Heather's thighs and prodded at the other girl's wet cunt, immediately prompting a yelp from her accompanied by another small jet of cum from her cock.

"Good news, pussy still works. Mmm, mine too. Oh, I can't wait to get filled up with a thick cock, maybe it'll even be yours, cuz. Ah, but first I have to go show Trent, he always did like taking it in the ass. I always had to use a strap on, but now I get to do the real thing. He's going to be so tight. Ungh, I'm cumming just from thinking about it." True to her words, a fresh wave of semen splattered onto the other futa's body, painting her body with even more white.

"Fuck, I need him now, I'm so fucking horny," Jenny said, rising to her feet with a small stumble, quickly making her way to the door, uncaring about her nakedness, her hard cock, or the mixture of semen that dripped off of her.

"No, wait, it's contagious, you can't let it spread," Heather called from where she was still laying on the floor, unable to **** herself to her feet after cumming so hard. She was helpless to stop Jenny from wrenching the door open.

"I don't fucking care, everyone in this damn bunker can become sexy futas like us so long as I get to cum in my husband's ass." The door slammed shut as Jenny stalked off, trying to remember where she had last seen her husband.