Jake was the one who got the package, he wasn't sure what was expected but he got it and took a look inside. It wasn't addressed to anyone in particular, and if Dad got something he didn't want him to touch he'd have said something. And if Jessica or Mia got any "private items" and didn't say not to look in any packages he may have listened to them, but they said nothing either. Still what was inside looked like some tech. Jessica and Dad were out at their work, Mia was in the living room in a simple T-shirt and shorts with her boyfriend Tom, and Lucy was being sociable with some of her school friends. As Mia wasn't coming to the door it probably wasn't her package.
Examining the emitter Jake saw a field to enter a name. Character creation? Jake sometimes enjoyed trying to make people he knew out of character creators in games to see how good the tools were. This time since Mia was the only one around aside from Tom Jake put in Mia Owens as a temp, and then out came a wire mesh model that looked generally like an average female young adult like Mia was... Probably a coincidence, but it was interesting since most of the character creators defaulted to male and not female. That was when the hormonal boy decided to try adjusting one stat and seeing how far it'd go.
Mia and Tom were Netflix and chilling. As in actually just watching some stuff together as they laughed and heckled while being somewhat close to each other. That was when Jake started messing with her stats, and Mia felt like her bra was starting to fit wrong. Then she felt the weight on her chest increasing drastically as she looked down as her bra snapped, and her V-neck started to get stretched. Tom normally didn't stare, but when your girlfriend who was right next to you suddenly has her boobs triple in size it's a little hard to not notice. He just hoped that Mia didn't notice his sexual organ growing as well. As her breasts were at the size of watermelons and not showing signs of slowing Mia could only think "How big are they going to get?" A question echo'd in Jake's mind as usually a character creator would have their max breast size be something on the human level, but the model's breasts were so big now that the screen was starting to zoom out a bit. That was about when he started to feel the house shake a little bit and shocked screams going on. Ok game time over, as Jake set down the Chronivac and went to the living room to see a massive pair of breasts seeming to fill the room... maybe even start to push against the walls and deform the structure a little.
"Oh thank gods, I think they stopped Tom." Mia said in relief
"Yeah... the heck caused this?" Tom said
"You two alright?" Jake asked trying to make his presence known "I felt the house shake a little and heard you two screaming."
"Do I look ok?!?" Mia shouted
Jake looked at the entrance which was mostly boob flesh and said "I can't see... Maybe I can try to..." and Jake tried to move some of the boob flesh out of the way. It was so soft and warm... He felt like he could just sink into them. Mia's moans could be heard till she tried to stifle them.
"THAT'S ME!!!" Mia shouted, "Could you try not to wriggle so much. it's so sensitive..." Jake ducked under what he guessed was a nipple, and entered the very much a canyon of cleavage that was... well the canyon of cleavage between her massive breasts. Technically he was seeing his step-sister topless, but since he couldn't directly see her breasts at this angle it didn't feel that sexual. She was pushed to the back of the wall in the couch.
"So... what you don't know how this happened?" Jake asked wondering if that device caused this... probably... too much of a coincidence.
Mia looked pissed and said "No, this doesn't happen you know."
From the other side of a wall of flesh Tom said "We were just watching a movie and then this! I think I'm going to need to go find Mia some large bandages or towels though. TV broke and I can only imagine what cuts it could give her."
Jake said "I'll call Mrs. Owens... she knows medical stuff and your family medical history... maybe it could help?" Obviously this wasn't genetic, but she'd probably know more than the average person. For sure this was more appropriately dealt with by Jessica than Brad. Jake however grimaced thinking he had caused this and maybe could change it back.
With the only thing to look at between her cleavage Jessica saw Jake's expression, but wasn't entirely sure what it meant on that twerp. Concern about her breasts? Oh if that Twerp had actually caused this he better hope her breasts dont shrink back cause then she'd strangle him...
Jake back at the Chronivac just shrank the tits down to nearly nothing. They weren't that small before, but... Now what would he even do now?