The Roommate's Son and the Growing Dog

was in Newton or something visiting dad and he had an older roommate like himself who had a younger son with some mental illness but he usually lives with his mom. But this weekend he was going to stay with the dad at our dads apt. Me and james we're visiting. They also brought their dog which was like a German shepohard mix puppy and a little wild. We were all at the apt and met the kid. Was nice enough, maybe 13-14 and has Aspergers or something and a little loud and honestly just annoying. Me and james were younger again, james was probably 11-12 and I was maybe 14-15. We tried getting along with the kid and being nice but he was kinda a dick and got a little violent easily. At some point James squares him up and the kid does something mean so James turns off the tv he's watching and the kid goes ballistic. He grabs james fingers and squeezes them. It hurts James but he's testing him and goes "yup, I'm ready, let's go take this downstairs" and they go to fight. But then it's not a fight, it's a pitching contest. The kid is much bigger and taller and has a little leach fuzzy mustache showing off his blossoming of puberty. James is much smaller. I say I'll ump so I can jump in if needed. They throw some pitches and the kid has a good arm and beats james. The dog comes in and starts play biting us at it does but now James is mad from losing and kinda punches the dog. The kid screams and runs upstairs. His mom is here now and she hands me a very young baby and asks me to watch him for a little. It's the kids younger brother. I watch him for a bit and he's fine, normal baby stuff. We go into my room and I let him crawl around for a bit and he's doing whatever. I have to pick him up at one point cause I want to go back downstairs to see what's going on with james and the kid slips out of his diaper. I go to put it back on and I see he's now pooping and laughing all over my bed. I grab him and run onto the deck attached to my room and hold him off the deck while poop drips down his legs onto the plants below. He's still laughing and starts peeing and little which gets on me and now I'm pissed so I run him to the bathroom and forcefully put him in the bathtub which already has water in it for some reason. I hold him down in the water(but not under it) while he flails around like he's scared of it or something. His mom runs in and screams WHAT ARE YOU DOING!? And pushes me aside and grabs him and pulls him out close to her. The kid gives me a devilsh look like fuck you, got ya. I explain it but she doesn't care or even hear me. I go downstairs to find james and I see he's asleep on the floor for some reason. I turn around and the mom is there with the 2 kids and dog. I tell them "I'm sorry our babysitting didn't go perfectly" and she says it's okay calmly. She tells me to come over and sit down. I sit next to James and look at him, he seems a little oddly asleep. She says dont worry..or worry. And stabs me with a needle. It immediately paralyzes me and I fall back but I'm still awake and can feel and see everything. She takes out some device that for some reason I can see and it shows both mine and james HP bars on there and that she shot me with a "17" paralysis and james a 14, even though he was already tired and mostly asleep, "just to be sure". Then she switches options and brings up a picture of the dog and has an age: and % growth: options. She puts 100% in the "growth" and after a slight hesitation hits "confirm". The dog immediately howls and barks, all very scared, as it's body cracks and pops as it expands in size by 100%. The kids clap and dance and the dog is terrified. She now commands it to like sniff us and kinda bite our legs but not really. Then she hits 200% and does it again. (Forget exactly when I wake up and how this ends but pretty sure) the dog turns on the laughing kid who like pulls its tail or something and attacks him. The mom, in defense, with the baby in her hand, like kicks the dog, who then turns on her and it's like a bloodbath. Pretty sure the dog kills them all and me and james, paralyzed, watch silently from the floor.