Use some magic to make her breasts larger Traveling the Multiverse chapter 9 by dellobenedetto

...You were feeling quite mischievous. So you walked back up to Shantae's rack, pressed both your hands onto her bra, and began channeling some size magic into her tits. Almost instantly, you saw results, with her boobs gradually growing larger and larger in front of you. You could hear milk sloshing about within the growing tits, and could see her nipples go from slight lumps to fully hardened—seems like this was quite arousing to her. Something confirmed by her half-asleep moan and unconscious shift of her boobs.

Smiling at that, you stepped back to admire your handiwork. You had pumped in enough size magic that Shantae's bosom would be doubled in size at the end. Hopefully she would enjoy her new curves...