If you're still in the planning stage, I'd like to suggest a slight change to the ending...
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"Okay. Last one: why'd you make me take off my shirt for this?"
"You'll see right about..." Doc checked her wristwatch. "Now."
Lily felt a tingling warmth spreading through her chest and into her breasts. She let out a startled gasp as her breasts began to expand. Lily was frozen in place as she watched her breasts shoot up from B-Cups into C-Cups in less than a minute.
"What the hell, Doc?" Lily finally managed to squeak out as she sensed her breasts had stopped growing. "I don't know whether to kiss you on the mouth or kick your ass..."
"Don't sweat it, kid." Doc gave Lily a playful pat on her cheek. "Your cute little boobies would have reached that size on their own eventually. That lollipop just gave your hormones a little nudge in the right direction. It does that sometimes, I thought it might."
"This isn't going to happen every time I use those lollipops, is it?"
"Nope. That was a one time deal. From now on they'll just heal you up."
Lily let out a sigh of relief. She was partly thrilled to finally have a decent bust size, but she was certain anything bigger than C-Cups would look ridiculous on her.
"Keep in mind, kid," Doc added "All the other fighters in this tournament are at least a D-Cup, so you'll still be the little girl in the ring."
"Heh, that's fine by me. So, who's my next opponent?"
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What do you think?