Stay and watch

I tried to move, but my legs wouldn't let me. I was transfixed as I watched Brandon slide the head of his cock along her slit, before he slid it in.

"Oh my god," the professor exclaimed. "I missed your cock so much! My husband just isn't the same."

Grabbing her hips he started fucking her with long, slow strokes. She responded with a satisfied moan with each stroke. Watching this from the sidelines was incredibly erotic. I was amazed at the way his huge cock just disappeared into her pussy. I couldn't help but imagine what it would be like to be in her place, to be penetrated by that thick hard manhood. My mouth was completely dry.

Reaching up he grabbed hold of her shirt and with a single motion ripped it open, buttons flying everywhere. Underneath she was wearing a matching red lace bra which he pulled aside to access her tits. They were surprisingly large, the way she dressed had hidden her figure well. Mauling her tits, he picked up the pace and started hammering her with long hard thrusts. She responded enthusiastically, making so much noise that I was worried someone in the hallway might hear her.

"I missed these sessions with my favorite slutty professor," Brandon groaned as he pounded her.

"Me too! Me too! Please, never stop fucking me!"

With a guttural growl Brandon started coming, filling her with his seed. As he pulled out her pussy was an obscene sight. Still opened up by his massive size, it was leaking cum down on her desk and onto the floor. Grabbing her hair, he pulled her off the desk and into a kneeling position in front of him. He slapped his dick on her face a few times, still semi-erect and covered with her juiced and leaking a bit of cum.

"Show Emily how good you are at cleaning a cock." His voice was hard, commanding. Giving me a short look filled with shame, she nonetheless complied. Opening her mouth, she swallowed his entire size. I could see her throat bulging. She started moving and deep throated him expertly. It didn't take long for him to be fully erect again. With his hand in her hair the blowjob turned into a face fuck. Somehow she was able to handle it even as he violated her throat with everything he had. Tears were running down her cheeks and saliva down her chin, but she persevered. Perverse glugging noises filled the room.

"See this Emily?" Brandon said, looking at me. "This is what a well trained cocksucker looks like."

I could hardly breathe, let alone respond.

"This will be you in not too long."

Oh god, why did that thought excite me so much? I watched rapt as he held her fast and came a second time, emptying his balls down her throat. Her eyes had rolled up so much I couldn't see her pupils. Satisfied that she had swallowed his load, Brandon let her go. She collapsed at his feet, heaving and coughing. Laying there she looked up at him towering above her.

"Thank you for using my face," she managed to whisper. I could only stare at her, amazed at the depths to which she had fallen.

"You're welcome," he said and walked out, leaving her on the floor behind him. Left to decide whether to follow him or help the professor, I was frozen in indecision. Unable to face the human wreck in front of me, I too left her behind.

Brandon was waiting for me outside. We exited the building without saying a word. Me trying to process what had happened, him observing my reaction.

(Kink +10%)