SCPX-558 "I know it's wrong but..." Sibling incest crossing the line in secret from mom

The distance that should not be crossed between sister and brother quietly collapses. Seeing the sister urinating in the bathroom by chance, their relationship warps instantly, a gap forms, the air changes—from here it accelerates rapidly. Suppressed emotions unravel, impulse takes precedence over reason. A step that should have been reversible becomes a step you can't go back from. The feeling of going against the current. The more you try to stop it, the stronger it gets. Expressions, distance, air temperature changing with each stage. That's incest.