I witnessed my NEET sister masturbating and lost my reason. I didn't notice that she was cumming and just kept pistoning away. MIDV-699

Overview： "I saw it..." My little sister's room is messy and she's not tidy. She's been wearing the same ugly tracksuit since middle school. She's addicted to her smartphone and has poor eyesight. To top it off,she's a shut-in and a NEET. A typical loser girl... Of course,since we're just brother and sister,I had no interest in her. -- I saw my little sister masturbating in earnest! At that moment,my morals,ethics,and reason all collapsed. I became a sex monster,turned on by my little sister! My little sister's dried-fish loser pussy was awakened! I ended up doing vaginal pounding over and over again...