I'd decided that I'd waited long enough - I'd told him several times that I wanted to grow and he'd ignored me on every occasion. I had him where I wanted him and there was nothing he could do about it. Screw asking, this time I'm laying the law down!
"Well, Matty, since you were very rude in avoiding the question, I'm just gonna give myself another lil' boost anyway!" I teased to him.
"Tina, wait! I don't think you... I mean... Y-you really shouldn't do this! I-it isn't natural!" he stammered, barely able to get his words out. I smirked, gesturing down to my enhanced proportions.
"On the contrary little bro, I'm all natural!" I say, shaking my boobs and hips, getting some small excitement from the creaking of the floorboards as I did so.
I pulled the remote close and aimed the nozzle at my skin. Matt climbed to his feet quickly and tried to run past me - it was so stupid and obvious. All I had to do was step slightly to the left to block him off, sending his body flying into the wall. I let out a laugh, noting that this little coming-together barely made me flinch. God, I am so strong now!
"Nuh-uh-uh little bro, you'll have to do better than that" I said, firing the device at myself. A familiar sensation washed through my bones as I let out a satisfied shriek of delight in contrast to Matt's very obvious look of worry and concern. He was speechless from fright and I was in ecstasy, feeling the hem of my way-too-small nightie become tighter around my midriff, the sleeves pinch on my arms and my breasts spill out of the top. It didn't take long for that and my panties to shred, leaving me naked and growing. Still, my brother stares at me dumbfounded!
It became obvious soon that as I grew, my head would come into contact with the ceiling. To counter this, I kneeled down in front of the bedroom door, blocking his only escape. "You're trapped in here with your growing sister, Matty!" I sighed through the waves of growth. "What are you gonna do?"
For his part, deep down, I couldn't blame him for not doing anything - I was obviously already intimidating enough to him at 7 feet tall. By now, I must have been 10! And will probably be more than double his height in mere moments!