School girl Muscle Princess has come to see her High School buddy at the lab in chemistry class. She sees him deep in a train of thought. She asks what he is up to. He tells our muscle school girl that he thinks he has developed a growth serum that could change science forever. She decides to try his elixir without his knowing. She feels a warmth fall over her body as her clothes start to tighten around her arms, chest and legs. Next day her friend is upset to discover his potion is gone. Muscle Princess tells him she drank it and shows him the results of what his tonic can do by taking off he... Show more