Exhausted from hours of cumming Eric looked over at the pale redhead beside him, then down at their intertwined hands. A few hours before, while Rat screeched her last half intelligible words, Sarah's long fingers had slipped through his and remained there ever since.
Feeling his eyes, and still panting, she turned to gaze into his eyes. "I think we need to figure this out." He breathed, jerking their joined hands.
"Yeah..." She breathed, a silence forming between them. The only sounds the slicking of a rat curled up licking itself clean of the sea of cum it still rolled in.
"Are you... Still..." Sarah's eyes fell onto the little rat. Eric looked over at what had once been his girlfriend Lisa. Watching the animal roll around in cum was still super hot to him, but now...
"Well... We're hardly in a relationship now. She's been fucking wild rats for weeks. I don't even know what kind of relationship we were in during that time. She wasn't exactly a conversation partner..."
This was her moment,
"So... Not like me?". She whispered holding tightly onto his hand. Her eyes sparkled with eager hope.
Eric was conflicted. The revelation that Sarah had crushed on him before he got with Lisa had made him curious, and their constant proximity and interactions recently only increased that sense of intrigue.
He had wondered the path that could have been, had he not been distracted by the younger, beautiful sister. The one that did everything to feed his depraved desires, and eventually gave in to her own.
"I have very... Unsustainable desires..." He gestured at the mewling rat. Sarah cracked a grin, "You like watching people transform?" She queried, he nodded. "You're an amateur..." She chuckled. "If I had the Chronivac then transformations would already be on the news."
He thought about that. It was true, a lot of the more crazy thoughts he had had been fueled by Sarah or her stories, they'd really helped him flesh out what his kink was these past months.
She stepped back, pulling at the top button of her blouse, undoing it with a *pop*. "I want to show you something Eric". She popped the second one. Showing her pale freckled collarbone.
In doing so something dawned on Eric. He'd never seen Sarah nude. In fact, specifically he'd never seen her upper body nude, only the bottom half with its great big monstrous clit.
"No one's seen me... Not like this." She popped another one, revealing a sports bra, which already looked off to Eric.
Sarah always wore baggy or bound clothing on her top half he realized. Dungarees or hoodies, blouses or wooly cardigans. Never form fitting or shapely clothes.
Sarah had paused, top unbuttoned but still hanging to cover her chest, just leaving a thin strip of white connecting her nape to groin.
Keeping eye contact she pulled back the blouse and let it drop to the floor. Eric goggled at her chest. Her right breast was maybe a C cup, perky, and with a large pink dark areola. The nipple on that side was chunky and stubby and ringed sparse ginger hairs. On the other side Sarah had no real breast at all, just a fleshy A-cup looking pad from which a pink two inch long nipple flopped. Most bizarrely of all, under the long nipple, maybe 4 inches down, she had another of the same size and shape. Finally, her innie navel was also visibly ringed with downy ginger fuzz.
Between the revelation of her chest, her large slit, puffy labia and obscene clit poking out, long legs and unusual, but pretty facial features, Sarah struck a bizarre figure. The familial bones of Lisa's gorgeous features were there, but everything was just a little moulded out of place, just a little bit paler than normal, skin spiderwebbing with blue veins, hair just a bit more curly and frizzy than ideal, all to give her an overall strange but intriguing look. But one Eric felt his body stir at. This was no Chronivac job. Sarah genuinely looked like this
"I already feel like a mutant goblin most of the time. So seeing others be more like me gets me well off. If you want to... We could change people, together?". Her chest heaved, despite her normally blasé attitude to sexuality and depravity, she looked vulnerable for once.
All of the time spent together came crashing into one conclusive realization for Eric at her words. There was no one, no one at all, that he felt more in synch with, he definitely had a thing for Rat mutants now, but there was no one that he was more open with, no one that understood his desires more, no one that mirrored his desires better, no one else he could imagine himself doing what he was with now. He wanted them to be together, to corrupt the world, together.
He told her that. Sarah pursed her lips and nodded. Her eyes drifted down to the cum soaked Rat that was once her sister. Heedless of the Rat cum surrounding her, she stepped barefoot into the puddle. Cum welling up between her toes, making her shiver.
"Sarah?" Eric asked. She responded with, "Don't get excited. I've seen how much cum it takes, and how long it takes. I know this won't do anything. I'll wash it off in a minute..." She squatted down and with a gentle motion, scooped up the slick Rat that was her sister. The creature churned tiredly at being lifted.
Sarah walked the exhausted Rat over to TomTom's cage, whispering, "it's my turn now sis", before dropping her in with the Rat that had started her transformation. Lisa turned, sniffing the air in the cage, before turning over lazily and presenting herself. TomTom, recognizing his mate, wasted no time and mounted the female, eager to add his own jizz to the party.
Sarah stepped back, "One done..." She looked at Eric and smiled, "I'm going to clean up... Then we're going to have fun. You should scrub everything..." She winked and walked into the ensuite, closing the door behind her.
In the bathroom she began to shake with excitement, gasping with surpressed emotion. Her hands were shaking.
Leaning against the door she slid to the floor, silently laughing. This was it! Somehow every crazy thought and desire she had could now come true.
She held up her shaking hand, it was still slick with the Rat cum that soaked her sisters fur. She brought it to her nose and inhaled. It was acrid and vile smelling, but knowing what it was, what it had done to Lisa, and what it could do made Sarah shiver. Enough of this stuff could turn anyone, willing or unwilling, into a mindless breeding animal. Her sister. Her parents... Eric's mom... Her classmates... Anyone at all... She shivered.
Unlike her sister, Sarah didn't have any want to lose her mind. And still... The thrill of her transformative world dream has prevented her from immediately washing it off. And the she thought, this Rat cum was special. This was the very seed that had finally removed Lisa from the picture and opened the door. It needed to be part of her now. Part of her and her story.
She brought her fingers to her lips and sniffed again. It really did smell horribly pungent, but the promise of its power made her enormous clit jump in arousal. Her massive 'mutant goblin' clit she had dubbed it, once she was old enough to understand and enjoy it.
Mind made up, and before she could change her mind she spun her hand and buried three fingers into her tired snatch, wriggling them to spread the cum around. She groaned in arousal. That would do it, some tiny, miniscule part of her DNA would be a rats, made by the same seed that got her her dream, and linked her to her sister. That would do.
With a sigh she removed her hand, pulled herself up, and twisting the knob, stepped into the shower.
---
Eric had cleared the room with the chronivac, though left Lisa covered in cum, still being fucked by TomTom. He watched the pair for a while, both enthusiastically squeaking and coupling.
"Well, you seem happy!" He spoke to the two rats. "I think this was the right choice for you."
The shower hissed in the other room as he went back to the Chronivac and did some more housekeeping. With a *pop* his second cock sucked back into him, and next he reverted his rat cock to its original setting, watching his rat balls deflate and tapered tip widen.
He was about to get up when something struck him. It'd been months since he properly saw it, but something looked off about his human cock. Was it...?
He pulled up the Chronivac and found his own stats, then scrolling through them slapped his forehead. All the skin contact with unscrubbed Rat cum had done a number on him. He was 0.37% Rat DNA, but primarily focused in his cock. It was human coloured and textured. But definitely a little on the thinned side on top. His cock head like a mini cone. It was weird.
"Well that's not completely unexpected..." He puffed, and flopped back.
Next, out of curiosity he pulled up the stats of all the transformers at school. All were still below the 10% DNA threshold, except Kiara, who was already 27% goat, and Amber, who was 11% horse. She checked out a few more stats, noting anything interesting.
Brooke, it looked like, was in heat for another week, and was perilously close to giving in to fucking her dog, she'd never last another week.
Carmen and Jorge were still using condoms, but he could see Carmen was developing a breeder kink.
Kimi was fully bought into being her daddy's hucow slave. To the point where she was losing interest in academia.
The door to the ensuite opened at this point and a naked Sarah strode out, wet hair still clinging to her. She looked different with her normally frizzy hair cascading in ringlets down her pale shoulders. She was still naked, long nipples hard and bouncing in as she strode. She had a bashful, but proud smile on her face.
"See you've scrubbed up!" She commented, "that's good". She passed him and turned to lie on the bed, bringing her feet up and spreading her knees, fully showing off her snatch and clit.
"Soooo... What messy shit do you want to try first!?" She asked, trembling, "hedonism club? Watch some horse lovers TV? Some hairy incest? Milking pet play? A knotting adventure? There's a lot of things we could watch." She mmmm'd, gently rolling her clit around.
Eric turned on his chair fully at attention, "first things first." He stood, looming over her, her breath quickened, "making up for lost time.". He mounted the bed, positioning his cock at her entrance.
With needy eyes Sarah grabbed at him and pulled him in. He sank into silky smooth depths. It felt different to the animalistic rutting he'd been at the last while, but it being the sister of the woman he'd just turned into a rat, was more than kinky enough. Plus, he felt a connection here, both knew what they were embarking on. Sinking in he hovered an inch from her wide lips.
"Just kiss me you perv... You know we're ma..." She got that far before their mouths collided and months of tension released.
What followed was an epically messy sex session as the two tried every position and type of sex they could come up with to explore each other's bodies. It lasted well into the evening and only ended when the Chronivac made a ping noise.
Intrigued, Sarah pulled back from Eric's asshole and made a quizzical sound. Panting Eric clarified. "I set that up with a warning when one of the transformees is at something naughty."
"Ooohh!!!!" Sarah clapped her hands. "Which one?"