Your girlfriend easily tackled you to your bed and started pushing your button quite a bit. Your body shrunk smaller and weaker as your hair gained volume... as did your boobs. The things were massive and you grunted a soft adorable moan as your girlfriend played with your nipple for a second.
"Man those suckers got big... your nipples are like... well... that gives me an idea..." Your girlfriend said as she pressed the button making button again. You grunted as your left nipple grew harder and slightly larger. The vibrant pink turning into a cherry red as it indeed turned into a button. 5% chance you turned back into a guy and could wrestle the button away from your girlfriend you thought. However that was very unlikely for just the second button. Turns out that logic held out as when your girlfriend played with your once nipple you changed further as the breast the button was attached to felt like it split in half, but looking down at your now three breasts in a row they were all the same size... and two of them had buttons on them.
"Didn't think that could happen" you muttered.
"Yeah, think this is a new button or a copy of the old-" your girlfriend didn't even finish her thought before pushing the new button on the new boob. The breast split into a new copy with a third button nipple. She seemed to get excited as she continued pressing the buttons as it felt like exponentially were gaining more and more breasts.
"Wait!" you shouted feeling dozens of boobs on your torso. It seemed like they were close to spreading to your arms... maybe even your neck. Your girlfriend relented "Maybe we should look for an undo button? Before this duplication gets out of hand?"