María Roja calls her step-brother-in-law after learning that her sister ended up at the gynecologist with an intimate injury. The doctor’s diagnosis was clear: it seemed to be caused by a large sex toy. Outraged and confused, María confronts him, demanding to know what kind of objects he s been putting inside her StepSister. But he calmly replies—there were no toys involved… just his massive manhood. María’s shock quickly turns into a bold curiosity, and in a moment of weakness, she asks to see the thing that brings so much pain and pleasure. What began as a StepFamily confrontation soon ignites a dangerous spark that s hard to put out.