The DD-cup
From Create Your Own Story
You discretely hand her the biggest one - a massive DD-cup bra.
"Really?" the girl comments. "I don't think this is going to fit any better... But, I guess you know best..." A series of barely audible sounds follow as she slips the monstrous bra on. And then:
"Holy shit! What? How?" She gasps, then falls silent. "God damn they're hot! Really, really huge and... sexy..."
As her innocent voice transforms into one of sultry excitement behind the draping, you feel your dick growing steadily harder. Until the point, when you're certain she has her fingers plugged into her sopping cunt, just starting to pleasure herself. You check one last time on the girl's mother and the clerk - still locked in discussion. And then you slip straight in through the drawn curtain.
The girl looks utterly unreal. Her tiny body verges on collapse under the weight of the added tits. They're barely contained, even by the massive bra. No way she could have grown such perfect massive breasts while maintaining such a skinny body! That is, without the aid of plastic surgery, or in this case magic... She doesn't scream at your intrusion. She only moans, deeply and hungrily. Her lips hang slightly parted, drooling with saliva. Her eyes are nearly shut, leaving only dark slits for her to gaze up at you through.
Fuck her newly endowed cleavage.