She comes home to you telling you she had ben to the Drs for her small boob problem. She takes the pill that will help, but for it to really work she needs you to cum on her tits multiple times for them to grow. You do as she encourages you to cum on her and begs for her breasts to turn into the fun bags she wants. The day after she comes in gleeful that her boobs have grown! She tries on all the shirts that are for large breasts and gets so excited how much they show them off now. She then begs you to cum on her tits even more to make them even bigger. She gives you gentle joi as she rubs each load of cum all over her tits.