Now that the standards of breast modification had taken place you want to try some of the weirder things that come to mind. The old man in the store had said, "any property" after all, so how far can you go? The first thing that came to mind was moving your tits without using your hands. Imagining your boobs with muscles capable of shifting them around effortlessly, you feel the tingle return. This time it feels like new things are being added to your boobs, but, looking at the mirror, this proves to be false. They look the same on the exterior and no movement appears to be taking place. But there is something in there. You search your mind for the answer and find a wealth of information regarding how your new muscles work, as if you had them since birth. Utilizing this knowledge you flex your boobs and watch in the mirror as they flatten and expand under the flexing of your breast muscles. You move your left tit all around in a circle, faster and faster, until it is just a blur that slightly yanks at your body and occasionally slaps against your other tit. Repeating this process with your right boob, you find that both tits have full movement that responds pretty fast. Using this you put on some music and bounce to the beat, right on the beat and left on the offbeat. It looks incredible in the mirror.
Satisfied with your bouncing boobs you move on to your next idea, cleavage storage. You had always wondered what was at the bottom of a woman's cleavage and now was the perfect time to find out. Using your new muscles to squeeze your tits together you take your hand and reach down into the abyss. Only to find it out on the other side. Dissatisfied you imagine boobs where the cleavage goes on forever and can be used as storage, but only when he presses them together. The familiar tingle returned, but this time between your boobs. Spreading them to look, no visible changes are noticeable. As the tingle subsides you form the deepest cleavage you can and reach into it. Your hand dosen't come out the other side. Pulling your hand out you run to your closet and start shoving as many things in as possible. Shoes, shirts, pants, it all went in. And your cleavage just kept accepting it. your boobs didn't change size and you never felt like you were dragging around any weight with you. Happy with this as well you decide to keep it. And after putting everything he possibly can into your cleavage. You wonder at some of the other potions you had ingested.