so Daisy wakes up, and she is just HORNY! like, the kind of feeling where you just need a good fuck you know? so she gets her phone, and is about to call Luigi... but then she starts thinking "I've had sex with Luigi hundreds of times... that wouldn't be a bad thing on its own, but Luigi almost never wants to do anything different! it's the same sex, with the same guy, every time! won't I get bored?" She does love Luigi, but she does admit he can be boring sometimes.
but then she thinks... "what if there was something different about him... or me even... to make the sex more fun?" taking this idea and running with it, she calls Rosalina.
"What is it Daisy?" says Rosalina before Daisy explains her idea. Rosalina sighs, and hangs up, before teleporting Daisy to the comet observatory. Daisy looks around confused for a moment, before seeing Rosalina and immediately figuring out what happened. "so you'll do it?" Daisy asks, as Rosalina sighs and takes out her wand. she says "sure, got nothing else." and Daisy cheers a little in her mind.
Before anything happens, Rosalina asks for clarity. "So you want me to change you in some way so you can have sex be more fun?" Daisy clarifies "yes! I really need someone to fuck me, and hard, but the only guy I've been having sex with never wants to mix things up. so I want something to be different about me to improve fucking." Rosalina sighs and says "well... there's one thing that never fails..." and waves her wand. a somewhat warm however pleasant feeling arises in Daisy's chest, as her clothes start to feel tighter in that area, she looks down, and sees that her boobs are growing!
"my boobs!" she exclaims, delighted at the sight of her already not bad d cup breasts growing even larger. in her hornyness, she starts fondling them as they grow. she never had a problem with her d cup breasts, (other than the fact that her gown was never all that nice to them, but that's a problem with her gown rather than her boobs.) but she was always jealous of the fact that Peach... A LITERAL VIRGIN... had bigger boobs than her. "sure, the girl who doesn't even know the word titties has e cups, while the girl who would enjoy them more only has d cups, THAT MAKES TOTAL SENSE!" she would always say to herself sarcastically while peach wasn't around, but now, her boobs are growing to e cups, f cups, g cups, they stop at g cups, but that's more than enough for the still really horny princess who is fondling her new g cup breasts, moaning while she does it.
Rosalina asks "so how do you like them?" and Daisy replies "they're awesome! thank you!" Rosalina responds with "you're welcome, I thought you might like them, and I'm glad you do..." before her face darkens a little as she says "because this is only the beginning." before waving her wand again.