My Sister the Sex Addict (Family Chemistry Book 1)

College student Jimmy's little stepsister Kim is desperate to do something about her undersized chest. So when Jimmy suggests what he says is the perfect dietary supplement, Kim is ready to believe him. But Jimmy's prank on his naive step-sibling backfires when she expects him to begin supplying the goods. And when some unexplained growth begins, Jimmy has no way out except continued production.