Jeff was exhaustedly resting naked on the floor after the hard masturbation section he had, but then he heard some steps coming from the stairs, the only person that came to his mind was his older sister since his parents were having a dinner. Even with all of his forces Jeff couldn't move a single muscle to lock the door and prevent his sister from entering his room, some seconds passed and Abby, his older sister saw him on the floor with a big puddle of cum.
"What the fuck Jeff?" Abby yelled, "so this is all you do when you're alone? God, you're so pathetic... and what is that sound?" She asked hearing a lots of moaning sounds, so she quickly took a look to the window and saw the monstrous thing that was outside.
"W-what is that thing" she was scared by what she was looking at, but something deeper in her thought something different, that sexual creature maybe... turned her on and shared that fetish with her brother even if she didn't want to.
But even if that monster made her wet, she wanted to know how that thing appeared, then slowly moved her gaze towards her brother thinking it was made by him, judging by he jerked of to that monster. "I-I... Have no idea" Jeff tried to hide his secret, but suddenly her sister looked at the Chronivac, looking how all the description of the monster was written in the computer, saying at the end "edited by Jeff Wilson", his sister put a smile in her face, making Jeff questioning was was about to happen, Abby now was laughing, "now you're definitely going to obey my orders when I want" she stepped his dick and started to type on the Chronivac, selecting herself as the subject.
Abby was an attractive girl with a solid pair of E-cup tits, slim body and round ass, and was just in her 20s, but her beauty didn't matter to her now that her plan of becoming a terrifying monster creature made her extremely wet. She started with basic changes in all her body, turning her breasts into a pair of giant H-cup breasts, made her ass bigger, and turned her body chubbier, then came to her the idea to make herself older, so she changed some of her body features and her face, she would look like a 35 years old milf, like a sexier version of her mother.
Finished her human features, Abby started with the interesting ones, she added three more pairs of H-cup tits to her chest, having 8 breasts in total, where each one could lactate big amounts of milk. She changed her lower torso into the body of a spider, with three pussies between her pedipalps, five dicks attached below her abdomen which could lay eggs if she wanted, replaced the end of her spider legs by horse legs, and added 8 legs more.
Abby saw the preview of her future transformation, but she wasn't satisfied, so she added wasp and bat wings to her back, put more arms in her human torso, with a total of 10 arms, wich she replaced with large tentacles, turning the top of her head into a octopus head, resulting in her normal face but with a big slimy red two-eyed head attached a little below to her forehead. She lengthened her nipples turning them green and finally converting them into snakes that were stuck with her tits but could still lactate through the snakes mouths.
Abby was happy with the preview of the monster she created, so she clicked enter and felt all the changes being applied in all her body while Jeff looked at her, she moaned like crazy looking like a sexier version of her mother with many monstrous changes that made Jeff hard instantly, which Abby noticed.
"Oh~ being turned by your now monster sister? You're such a degenerate" Abby said as she wrapped her brother with one of her tentacles, looking directly at him, "you were always the inferior sibling, my parents probably wouldn't care if I get rid of you" she opened her mouth and speaked by one of her snake nipples, "I wonder what would you taste like", she stopped wrapping him and shoved him to her big human mouth, swallowing Jeff completely and sending him to her spider stomach, Jeff could do nothing but struggle thinking a way to get out before her sister digested him.
Abby patted her filled stomach with her tentacles and burped, then she remembered the big monster outside of her house, which she realized was their neighbor Gabriel, now that she was a monster too and the new owner of the Chronivac, she thought in naughty things to do with Gabriel.