Why stop there? Give her J-cups.

You get a little devious urge. You told her about the notebook and she did ask you to make her huge. She just doesn't know what huge means.

Time for some education.

You write J Natural next to her name and grin and the flash of red. You snap the notebook shut and watch your handy work. "You might want to hold on to something."

"Huh? Why?" While Sadie considers your words, her chest shakes and stirs. It shakes and fattens under her shirt, but the changes don't stop there. Her T-shirt changes into a sturdy turtleneck, one unseasonably warm for the day and all at once, her tits stop growing, barely past what you could consider B-cups.

You squint down at her, realizing there's still motion under her shirt. As such close quarters it's easy to discern what's happening. Her tits are hidden, mashed down in some sort of binding.

Sadie blinks at you squirming uncontrollably. "Y-you know... on second thought. I don't really want my boobs any bigger. Wait a sec... my boobs...?"

She runs her hands over her chest, massaging the fabric of the turtleneck. "Why am I... wait..." Without warning she pulls up her top,yanking up a bra with the same tug, huge flopping breasts fall free with giant, tasty looking areola and thick suckable nipples.

You're taken aback by her action, but you're not really complaining.

Sadie looks back at you. "You did this. You made my tits huge?!"

You flinch. "Uh. Yeah." You're not quite sure how she knows about the specifics, though.

"These are too big! How am I supposed to compete with giant bags of fat flopping around. You said you'd make me a DD! These are like, cow tits!"

"Don't be like that," you say. "They look amazing."

"I'm so confused. I remember... being normal a second ago. But no... last night these grew like this! I didn't want to come to this stupid party. And it's all YOUR fault?" Sadie reaches out and grabs you by the collar. "I should kick your ass!"

"I can explain," you say. "I just--"

She silences you with a kiss. She pulls back, still clearly angry, but her breathing in shallow. "I'm angry but... they feel AMAZING. With tits like this, I can just fucking quit the Track team. They're real! No one can say I got implants. You could just take one look at me and tell that."

"Uh..." You're still stunned by the chain of events. "You're... welcome?"

"What did you want from me? Do you just get your jollies off by inflating tits or something?"

You aren't quite sure how to answer that. "...I just thought you'd look good like that. I dind't mean any harm."

"Well, here I am." She presses her tits together, truly demonstrating their impressive bulk. "Now that you gave me giant tits, how do you plan on taking responsibility for it?"