MIDE-579 She's a sex monster... My sister is. Chiemi Ito

My older sister is a 【hypersexual】 and it's driving me crazy!!! She has too much sex drive! Her threshold for sex is abnormally low! At home, she locks herself in her room and masturbates all the time! I'm really anxious because my first boyfriend is coming to stay over. So, I've also invited a bunch of horny guys to absolutely defend his virginity! My sister, who doesn't stop having sex even after the guys cum, is truly a formidable opponent! But I'll definitely protect him!!! "Yuji, are you still a virgin?"... "Are you okay? I'll keep it a secret from your little sister."