Shelby woke up and ran her hand through her shortly cut, brown hair. She smiled as she looked at the naked bodies of her girlfriends next to her. Rachel had small A sized breasts and so did Morgan. Rachel's hair fell just below the shoulder blades while Morgan's fell to her shoulders. A ray of sun shone through the window touching Rachel's hair at just the right angle to make the light brown strands appear to be orange. The sun crept in farther to reflect off of Morgan's black hair. Shelby was still horny after last nights threesome. She looked down to her size B breasts. Slowly, Shelby ran her fingers around her nipples causing them to stiffen. A small laugh escaped her lips, but it was enough to rouse Morgan from her slumber.
Morgan watched Shelby finger her own nipples. Her own nipples began to harden. She sat up and brought Shelby's lips to hers and they began to kiss. Morgan placed her hands onto Shelby's breasts and pushed her onto her back. One of Shelby's hands moved down to her pussy and started to rub as the other massaged her breasts. Morgan continued to make out with Shelby when she felt Rachel stirring next to them. Rachel was soon flicking her tongue against Morgan's pussy while she slowly pushed her fingers in and out of her own. Suddenly, they all reached their orgasm at the same time.
The women all collapsed breathing heavily. Shelby sat up after her heart rate slowed to a normal rate. "That was fun, but how can we make it better?" The debate went on for several minutes before they decided to head to the nearest sex shop.
Once inside they looked around. They debated dildos, vibrators, and strap-ons. None seemed to be what they needed. The store clerk walked up to them. Her name badge read "Kara". Kara asked them what they were looking for. The answer came from Rachel who said that their sex needed an upgrade. "I have just the thing. It's still in the experimental stage, but it's shown promise. We could give you a trial dosage that'll last about an hour. Breast growth is guaranteed, but you'll also get another effect. The effect isn't controllable, but it has always increased sexual pleasure." After an extensive discussion of the pros and cons, they decided to do the trial.
The three lesbians were led to the backroom. Kara opened a closet to reveal a hallway to a hidden sex lab. Once they were in the lab, Shelby, Rachel, and Morgan were strapped to a table and given two injections. Both injections went in through the nipples. The straps were removed and Kara left the room after telling them that they had an hour after the effects started before they wore off. It took some time, but eventually, the women felt their breast getting heavier. They expanded at a rate fast enough to be able to watch them grow. Shelby was left with DD breasts, while Morgan and Rachel had D's.