His mom and sister

There was a jangle of keys at the door, Finley's eyes went wide as he realised that the obvious answer to producing more silver was coming straight for him, his younger sister, Sarah, just back from University, and his milf of a mom, Katie, would make the perfect silver factories.

They called out that they were home, as Katie closed the door behind them and went to put some shopping bags down, and Sarah untied her shoes. There was no answer from Finley so his mom respected his privacy by knocked on the bedroom door, but asserted her authority as a parent by coming in anyway. They were shocked to see most of the room was coated in thick silver slime, oozing down the walls and seeping into the bed, on the bed was what could only be assumed to be Finley, a long cock on his small frame flooding out more parasitic cum across the bed room, his hands slipping in and out of his needy asshole and licking up the fluids. She screamed, but only briefly, as he sprinted across the room and held her down, sliding his new long beauty down his mom's throat, resisting and screaming against the cock as much as she could, although the second the silver touched her lips her jaw readily opened to accept more sliding down her, her throat visibly bulging against the sheer size of her son's rod pushing inside. By the time he pulled out, her eyes had glazed over and she merely smiled back at him, dribbling the same argent fluids from her lips, her mind understanding that although she was his mother, her main role in life now was to produce silver drones to spread this new bliss. Before they both heard a scream again, this time from Sarah as she tried to open the locked apartment door, the two silver sluts understood that she needed to be a silver factory too. They rushed over and pinned her down, Katie holding her daughter down and trying to soothe her, "It's alright, angel. Our roles in life are to produce silver drones from your hunky brother now, you'll understand soon once you have some of his yummy cock~" Sarah eyes bulged in fear, understanding the madness that was happening and fighting hard against her mother, her shiny form being impossibly strong against her, her milfy tits seeming to grow with each second and push against Sarah's chest. Sarah felt something against her and screamed again, looking down to see her older brother sliding his long, mutant penis into her little cunt, seeing the ridiculous length somehow slide all the way in and out of her, her insides reforming with each slick of silver as she screamed and moaned in equal, her mind racing at her losing struggle as she somehow enjoyed the feeling of her pussy being ravaged by this shiny rod, her fear waning as her own fluids started spraying against her brother's cock, her clit swelling with silver and loving it. Eventually her mom didn't need to hold her down, Katie lifting up Sarah's t-shirt and seeing two little mounds on her chest, before hosing down her daughter with her own parasitic breast milk, flowing down as Sarah moaned from the pleasure of it all, her little tits swelling up and filling with their own corrupted silver milk, leaking from their new bimbo form.

She looked down to see her stomach swelling, every spew from her brother's cock filling her more and more as she climaxed again and again. When Finley finally pulled out of his sister's juicy cunt, she instinctively stood up and let a wave of silver pour from her pussy, moaning and flicking her swollen clit as her stomach deflated and a lump of argent goo slapped against the floor. The lump of goo quickly formed into a fully formed silver humanoid, with a perfect, voluptuous, hour-glass figure and leaking new silver already, before mounting Finley, humping against him as he seemed to not lose any stamina, erupting inside the new being and impregnated itself with silver slime. Sarah straddled her brother's face and slopped argent cum and fluid down his mouth from her puffy pussy, as she breastfed her own mom with her new pornstar tits. As Finley climaxed again deep inside the silver drone, her stomach began to swell and she lifted up off of him.