An Afterschool Sex Lesson

Maria confesses to her instructor that she skipped studying due to 'superior, more vital priorities,' such as her clandestine assignment for biology class. So, what's the real deal with this assignment? Judging by appearances, it's all about arousing an elderly gentleman until his cock throbs with intense erection, followed by eagerly slurping his throbbing shaft and riding him vigorously until he explodes every drop of his hot cum.