I Witnessed My Sister Masturbating And My Reason Collapsed. Nana Yagi, Unaware That Her Younger Sister Is Coming, Pistons Her With An Explosion.

'I saw it...' -- My sister's room is messy and dirty. She's been wearing the same uncool T-shirt since middle school. She stares at her smartphone all day and has bad eyesight. On top of that, she's a shut-in NEET. A typical loser girl... Of course, since we're siblings, I had no interest. -- But I saw my sister masturbating incredibly seriously! At that moment, my morals, ethics, and reason crumbled with a crash. I transformed into a sex monster lusting after my sister! My sister's dried-up loser girl pussy also awakened! We ended up repeating uterine thrusts over and over again...