SCPX-558 "I know it's wrong, but..." play between brother and sister, kept secret from their mother.

The uncrossable distance between sister and brother quietly crumbles. A chance encounter with his sister urinating in the bathroom instantly distorts their relationship, creating a rift, changing the atmosphere—and from here, things accelerate rapidly. Suppressed emotions unravel, and impulse takes precedence over reason. A step that should have allowed for a return becomes a step from which there is no return. The feeling of being unable to resist the flow. The more you try to stop it, the stronger it becomes. It changes step by step...