Second hand story.
We had this accounting professor in the business school at college, mind you this was early 90s, he was in his late 20's, frosted tips, flamboyant clothes... everyone assumed he was gay.
After a night class this girl (who told me the story) went to his office to ask a quick question. She entered to find him shirtless in tight bicycle pants... with an enormous bulge. She started to ask her question, bumbling words as she looked at his well defined, ripped chest and 6 packs..."who knew he was a god under those funky tops he wore"... and enormous bulge that started getting bigger. He casually reached over and undid her blouse, sliding it off her shoulders. He said there do you feel more comfortable now that we are both topless? She said she giggled and felt foolish as she nodded. He smiled at her kindly and said would it help if you knelt? He hooked his thumbs in his bicycle pants sliding then down a little, exposing the deep well defined "v" muscles pointing down to his huge bulge. She put her hands on his wrists and pushed them down as she sank to her knees in front of him and struggled to suck his cock.
He stood her up and bent her over his desk, pulling up her skirt before pushing down her panties. She said it took him a while to enter her, and then the next few minutes she just moaned he was too big over and over as he slowly pushed deeper and deeper. He started fucking her faster and she told him she was being too loud someone would hear. He slapped her ass and she shrieked and he said he didn't care who heard. She said he fucked her hard, slapping her ass until he came inside her. She had yelled so much her throat was horse.
Two days later I watched her fidgeting in class, she looked uncomfortable in the seat. A few times the professor told her to stop fidgeting, but had this smile like there was a joke. At the end of class he told her to come to his office after his evening class to discuss this fidgeting problem she seemed to have developed.
15 minutes later we were having coffee when she told me the story, told me she couldn't sit straight because her right but cheek was still sore and red from his slapping it, and that wasn't the only thing still sore.