You immediately duck behind the aisle with the potions in it, recalling the instructions you concentrate and imagine the woman's boobs expanding about three cup sizes, with out breaking her shirt or either of them noticing. You feel a slight tingle on your chest but you figure that it is just the wind. With your eyes closed your mental picture is all the clearer, the tingle on your chest increases, again only the wind, and your mind runs wild with the possibilities of this tiny bottle should the experiment work.Your mental picture grows clearer as you imagine the possibilities.
Opening your eyes and looking around at the previously A-cup woman, you find she is still A-cup! And turning the corner at speed you feel a weight swinging around that shouldn't be there, attached to your chest. You pray that isn't what had happened but looking down you find your view is blocked by a pair of perfect round boobs. Exactly the kind you were imagining. You recall what the old man had said, "...to control anything about the specific body part listed.." nothing about controlling other people's parts, only your own! Shocked you sit down and lean on the shelf behind you, emotionally drained from the lost prospects.
"But," you reason,"this still has possibilities." First you had better make sure that the changes went unnoticed by the couple, as intended. Nervous, you casually walk in front of them, making sure that your new assets are as visible as possible. Waltzing past you see that the girl gazes at you enviously and the guy with lust but neither of them seem shocked at the guy walking past with boobs. Breathing a sigh of relief you turn around and head back to the potions aisle, all the way your funbags make it hard to maintain the casual gait of a twenty something year old, swaying back and forth with no regard for gravity or your intended direction, and they were heavy!
Figuring that it had better be time to return to a normal human being, you imagine your previous chest, an easier feat due to the number of times you have seen your own chest. Looking down this time you see as the bouncy milk machines shrink down to nonexistance and the sparse hair on your chest grows back. So the changes were reversible. You stop walking for a moment, then sprint to the back of the aisle. Finding the small rack you grab the search box and find several of the most interesting potions. You stand there and proceed to drink them in order of most interesting to least. First one, then two, three... before you know it the eight one is in you hands. Downing that you pick up the ninth one and repeated the process. You reach for the tenth one and try to lift it, but it will not budge. The tiny bottle refuses to leave its place. you struggle for a moment then have a flash of inspiration. Pulling out your wallet you find that there is no money left, only the ten receipts from the "purchases." With the conundrum solved you decide to ....