Complain to principal about Dr.Hein

You still have disgusting taste of semen in your mouth. "You guys go on ahead, I need to take care of something first, I'll see you in class" you explain to them. You decide Dr.Hein's actions weren't acceptable. He **** you to suck his dick, you didn't even have a say in the matter.
You walk with your friends into the main hall but they turn one way to head to class while you turn the other way to go to the main office.