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Courtney had always had a chest that was a bit bigger than she wanted. It was difficult to find clothes that she liked that would also accommodate her chest. The solution was obviously to find some sort of sports bra that would keep her girls in check while she wore whatever she wanted. The bra section of the store had always been a daunting place. Finding the right size was a chore, and she was never sure if any one brand was better than another. Courtney lucked out though. She was able to find a bra that not only fit perfectly but hid her breasts completely.

She was absolutely shocked when she put it on and found that she looked flat as a board. It was like her tits were literally gone, sucked into some unknown dimension. Thrilled at her find, she bought a bunch of cute clothes to wear with it. She wore it the rest of the day and eventually fell asleep wearing it later that night. It was very comfortable to wear even at night when she typically didn't wear one at all.

In the morning, she woke up and realized she hadn’t taken it off before passing out. She stepped into the bathroom and undid the clasp from the back. As soon as the clasp had been undone, the bra was propelled away from her by her sizeable tits returning. Only they were… bigger? Her tits were much bigger than before she had put the bra on. In fact, they were larger than her head. Courtney worriedly began to search on her phone for what might be going on only to land herself on an article about the brand of bra she had purchased. Apparently, the bra literally did transport your tits to a different dimension. The only problem was that the longer they were in that dimension, the larger they got. Upon removing the bra, the enlarged tits would be brought back. 

The brand had really only been known for use by professional Olympians who would only wear the garments during their performance, before immediately taking them off to avoid getting too large. Courtney kind of didn’t care though. As long as she could wear the bra whenever she wanted, then the size increase didn’t really matter. The only question was… how big could she get?