Infection Ball Buster - Sensei gets reverse gangbanged by horny anime schoolgirls

A virus is spreading throughout the school that makes both students and teachers wildly lustful. The infection is spread via sexual contact and it's spreading fast in the school. Schoolgirls need creampies badly and any who resist are tied up and promptly fucked till they are a sex-crazed zombie. Soon the infection starts to spread throughout the world.