BUSTY STEP-SISTER'S MAGICAL GROWTH SPURT

Your little step-sis, Codi, wakes you up to show you a cool rock she found. It looks smooth and purple and feels magical. She brings you into the bathroom to analyze it, and it starts to have an effect on her. She feels tingly and her breasts begin to swell. Codi unbuttons her top to reveal two huge melons growing under her small bra. Then she shoots up about a foot taller! Now your little sister looks like a tall, busty goddess. She confesses that she's always wanted to be a bigger girl, like the ones you touch yourself to. She asks you to inspect her new breasts and touch them, then she asks you to show her your cock and fuck her hard.