It's no fair that you say I'm too little for you... I'm very mature, and I'm even growing out of some of my bras! But you insist that I can't kiss you or be naughty with you or anything! Maybe it's because you like girls with big huge tits. Well I have a potion that will make help me grow up and make my tits huge! I take a sip and feel them fill up right before your eyes. I can see you hiding your arousal at your busty little sister, but I'm not done. I gulp the whole cup and start busting and falling out of my bra, moaning and staring at you. Come on! I promise I won't tell anybody, and I'm not a little girl anymore!