Figuring its best that your next move look like you're going back to trying to fix the light, you consider that the man's torso seems a bit more changed than Rose was... Perhaps if you changed his gender, he would have different breasts than a human would.
Flicking it back to default, you make s bit of a show of bumping it against your wrist a couple of times to make it look like a small bump can switch in on or off. The man doesn't really seem bothered by the sudden light on his back again, and within only the couple of moments under the bright light you see his rear balloon out into a much more plush rear.
You try not to look too eager to see what happened, there were other people around after all; and you couldn't try to catch their attention like before. You sipped your coffee as you waited for them to make a move that showed what had happened; better not to change seats again so soon... Though you could always take a look on the way out.
After a minute, they adjust themselves awkwardly as if the way they're sitting isn't comfortable anymore, and turns a bit in their seat, showing that the light hasn't just affected their behind, as you can see that "she" now has a sizable pair of boobs between her legs with the bottom of them poking out from under their now untucked shirt, a bra apparently having materialized around them. They still look rather human shaped, they're not exactly an udder; but they're certainly in the wrong place on a human.
You try not to laugh at what you've done, and you cup your hand over your mouth to hide your grin and look like you're thinking.
At this point you wonder... Are you really testing what the light can do anymore? Or are you just trying to see what you can get away with.
You look across the café, with so many people, you could try to turn all of them into animal girls, whether they were man, woman, or child. Nobody seems to have paid any attention to the light, besides Rose, and that's only when you brought attention to it... Would they notice if you shone the light over all of them at once, even on bright?
Still... It might not be best to push your luck... Maybe take the light somewhere else where you'll draw less attention if you're flicking a light around; maybe wait for dark so it seems normal. Then again, if you take it home, you could try some... Interesting things with yourself in private, see how it feels to use it on yourself for once; you haven't actually tried that yet.