Bend her in Bender's class

"Oh fuck!" I though to myself as I looked up at Mr. Bender. I had to act quickly. "Come in and lock the door!" I said.
Mr. Bender locked the door and closed it behind him. "What in blazes is going on in here!" he demanded to know.
"Oh, Katie is showing me her chemsitry exhibit," I said and thinking how the command would wear off of her, I turned to her. "Katie, just keep going. You enjoy this and know Mr. Bender will too." I watched Katie keep fingering herself as her breathing grew heavier. I turned again to Mr. Bender who seemed confused but was still angry. "This is a chemistry exhibit, Mr. Bender. You totally approve. You want to help."
"Oh, I see now," lied the still confused Mr. Bender. He knew it had to be a chemisty exhibit but could not figure out what it was supposed to prove.
"Yeah, and now Katie's going to let me take her from behind, aren't you, Katie," I said as a command and not a question.
"Mmmm, yesss," she said as she was very, very horny now.
"Mr. Bender, why don't you pull down your pants and jack off all over Katie's face. She would love that, and it would really help her out."
"OK," said the confused and now embarrassed teacher as he approached Katie and pulled down his pants and briefs.
I moved up behind Katie who was bent over a desk and stuck my rock hard cock in her soaking wet pussy. Mr. Bender lubed his hand with his own spit and started stroking his cock, aiming it at Katie's face. I fucked Katie, every once in a while slapping her ass to make her squeal a bit and finally shot my load. Mr. Bender shot his a few moments later. His cum splattered her forehead and eyebrows and dripped down her face. I had him zip up and wondered what to do with Katie. Have her keep the cum on her face? Have her not redress? Have her go bring in a friend? I had thousands of choices?