Mint, a younger sister who loves her stepbrother, tries her best to somehow have a physical relationship with him. She tries to seduce him at every opportunity, but he always evades her at the last moment. Then, one day, she finds out that her stepbrother also likes her. He has been holding back because he thinks she is his sister, but he finally gives in, and they devour each other's lips, slowly laying their bodies together, and are united. However, her stepfather finds out about this...