I shifted again, my panty clad ass embarrassingly squeaking a bit on the chair, then finally I had the the dildo positioned properly to thrust to the hilt into my bare cunt. I wish I had sat in a different chair, this one's dick was not quite the right size after all this time getting stretched by the big guy, though it was still doing a good job thrusting in and out of me. I wish I could say Mike got a show, but my bugbites were probably not visible in my t-shirt, those never got his attention anyway. Before I could ask him anything, Cummings called the TA over, seemingly getting Mike's attention as well, "We... have one?"
The professor leaned over the desk, allowing the TA to take his huge, thick dick and fuck her over the table to go to the next slides. She was showing videos of how different sized pussy's look as they were penetrated by cocks of various sizes. The TA went a bit slow at first, until she admonished him because the videos weren't at full speed. "Oh my god, what's going on" Mike whispered. I looked over at him again, brushing my bangs out of my face, finding his eyes locked on the teacher's bare basketball knockers as they bounced all over the place. The TA reached around to palm them after she admonished him again, kneading and fondling them as he thrust into her and she continued droning on about penetration angle and optimal size combinations.
My chair thrust its dildo particularly hard into me just then, making me let out a slight eep, which I tried to cover as a yawn and stretch, enjoying the feel of my apple sized breast sliding along the inside my tight tank top. I had a look behind me. I could easily see the cunts of the girls in the row behind me being stretched open by their chairs as they posed to show off their various sexy and revealing shirts, all naked below the waist. Farther back sat the shyer and less attractive girls, those who had smaller boobs, or a were a touch fat, and while I couldn't see them being penetrated by their chairs due to them wearing skirt, the way they sat let me know they were getting fucked all the same. I turned back to the front and leaned over a bit to rest my bra clad but still heavy D cups on the deck.
"Laura what the..." Mike said. I turned to see him staring at me, or more accurately my bare DD cup tits, with a look of shock on his face. I lifted up a little and thrust down, trying to get the cock thrusting into me a bit deeper, being sure to sure turn a bit and spread my legs so he could see it thrusting hard between my tight cunt lips, just to tease him a little. Out of the corner of my eyes I looked critically at the girls in the back row again. They might not be as stacked as those further forward, but they had some nice, if small, assets to show off in their tight outfit, though nothing on the girls even one row in front of them, who made sure to spread themselves wide for all to see as their naked forms were fucked.
"What is it today?" I asked. "Stoooop it, you'll get us in- Ah! trouble again!"
"But Laura, I mean... Your... Your breasts?"
"Whaaaa~t about my boobs?" I asked looking down. I glanced behind me again, brushing some of my long brown locks out of my face. I was plenty large but so were all the other girls. The prudes in the back might not be showing off getting fucked by their chairs like everyone else, but I could see their bra clad bodies weren't that much less bodacious than mine.
Following this...