As you sleep, the magic of the Yureis starts to affect your body. It settles in your chest first, the point where your body's abandoned feminine development is most obvious. An imperceptible force seems to feel through the kimono, finds your nipples, and... coaxes them. Your unconscious body responds eagerly, recognizing the magic from the wonderous effect of the soap balls and becoming pliable to its suggestions.
Your previously functionless nipples start to widen and turn erect, enlarging until they tent against the fabric of your kimono and rubbing at it, sending surges of arousal through your body. Morning wood emerges several hours early in your crotch- not that what the magic is doing is conductive to you having a penis.
Your breathing deepens and quickens as flesh slowly starts to accumulate around breast buds under your newly developing nipples. At first you have A cups, and they quickly enlarge to B cups, maturing rapidly. The changes are even affecting your dreams- a strange psychosexual fantasy emerges in your subconscious in which you sprout rapidly, and present your newly formed chest to a crowd. They all seek usage of your breasts, from infants suckling on you to adolescents seeking to indulge themselves to young adult men who carefully play with them, and for some reason all the uses pleasure you. Having your newfound femininity affirmed suddenly feels right.
Your chest is almost irrevocably female now, and the changes are starting to approach other parts of your body...