[SCPX-558] "I know it's no good..." Secret Sibling Incest That Crosses the Line Without My Mother Knowing

The distance between sister and brother that must not cross quietly crumbles. I happened to witness my sister peeing in the bathroom, and that instantly distorted our relationship, creating a gap, changing the atmosphere—from here, things accelerated rapidly. The emotions I had been holding back unraveled, and impulses took precedence over reason. A step you should have taken when you could turn back becomes a step you can't turn back from. That feeling of not being able to go against the flow. The more you try to stop them, the stronger you become. Expressions that change at each stage, distance, and air temperature. That is incest.