Russian Institute 24: The hussy (2018)

With their prim uniforms and angelic faces, you'd think butter wouldn't melt in their mouths. But the students from the Russian Institute never miss an opportunity to let their hair down, and their headmistress has a hard time keeping order in her establishment. To all appearances very serious students, Lexi and Darcia make the most of their "private classes" with a good-looking professor to expand their knowledge of male anatomy.