You look up at Dustin, who minutes ago was a runt, but now stands at 6 feet tall, with more muscles than most of the jocks at your school. He's smiling, looking down at his new body, marvelling at his powers that you gave him.
"Oh Ty, how could you keep this power from me?", he asks, trying to hide his liking of his new deep voice that he stole from you, which is would be a turn on if you weren't terrfied of what was going to happen to you. "I hope you know that this was a grave miscalculation on your part".
Your heartbeats rapidly as he starts to walk towards you. You look for a way to escape, and start running to wards the door, pulling it open and stepping into the hallway. Looking for Mark or June, you see a desk to the left instead of the bathrrom door that should be in its place. Spinning around in confusion, you see Dustin standing at the bedroom door laughing. A look of confusion comes across your face before you realise that Dustin has just teleported you back into your room, where he can reach you. He walks towards you again, and before you can even react he grabs you by the waist, lifting you with incredible ease.
"Holy fuck you're light, I need something heavier" he says as he walks towards your drawers, picking them up, and you hear all of your belongings roll around inside. "I could fucking lift a car with these muscles"
As you begin to wonder what horrible things he will do with the ability to change everything, he turns to the mirror, admiring his new proportions. Looking at his reflection, you have to admire the body he designed for himself, with biceps not too big or small, but with the strength to lift you with one hand, a perfect 6 pack, underneath sculpted pecs, and perfect thighs and calfs, which were almost blocked from view by his giant cock and balls. Dustin catches you looking and laughs. "Oh dear Ty, you had everything going for you, one chance to make everything better, and you ruined it. And now I think a punishment is in order for you trying to defy me." Trying to move you find that your feet on't want to move, rooted to the floor.
"Dustin, we can be friends, I didn't mean to change you" you plead. Dustin, still facing away from you, starts speaking.
"My next wish is that you are mine, under my control, and forced to do anything I want you to. Nobody can see you unless I want them to."
A purple mist rises from your chest, floating around and filling the room, before rushing and disappearing into Dustins massive chest.
"Now Ty, suck my dick"
You can't control yourslef as you walk to your step brother, bending down, not by much though because your eye level it at his abs, and slowly start filling your mouth with his cock, realising that this is your whole existence now, all made from one misdirected wish.