I saw it… My sister's room is always messy and dirty. She has been wearing the same ugly tracksuit since middle school. She's addicted to her smartphone and has bad vision. On top of that, she's a shut-in and a NEET. A typical rotten girl… Of course, because we're siblings, I had no interest in her.—But then I saw my sister doing incredibly serious masturbation! In that instant, my sense of morality, ethics, and reason collapsed with a crash. I became a sex monster lusting after my sister! My sister's dried-up rotten girl pussy awakened too! I kept repeating the vaginal penetration over and over…
