Gill leaned over my desk to see my work and her blouse fell open enough for me to see her bra and her huge cleavage. She sat on my desk and let her foot dangle in my lap. Then she started to rub my crotch with her foot. I was very close to cumming when she stopped and got up.
"Time for PE now. If you haven't got your kit you'll have to do it in your underwear." As I started to strip off she sat on her desk and rolled her stockings slowly down her long, smooth legs.
When I was in just my boxers she told me that because the class had been so naughty she was keeping us in today to watch a video instead. I sat back at my desk and Gill sat behind me to start the film. It was an old sex education film that was dry and boring. I glanced behind me and saw that Gill was undoing buttons on her blouse. Then I heard moaning from the video and turned forwards again to see that it had turned into a modern porno and Aria Giovanna was being taken from behind, with her face and swinging tits near the camera.
Suddenly I felt Gill's hands tracing across my chest and playing with my nipples. Her hands started to work down towards my crotch when the film ended. She switched on the lights and I saw that she had taken off her blouse and was wearing just her bra.
"Ok, today's lesson is about these" she used her cane to point to a picture of breasts that appeared on the board. "Breasts, bosoms, boobies, tits, mammaries, whatever you want to call them." She went on to explain about bra sizes, demonstrating on her own bust where to put the tape measure.
"Now, come and have a go at measuring mine," she came up to my desk and handed me the tape measure. I wrapped it round her tits, my hands brushing over her bra. She was a 36E. Gill pushed away the desk and knelt in front of me. "Now, you'd better have a good feel of them to see what they're like."
I ran my hands across her bra and squeezed her breasts. I used my fingers to play around her nipples until I could feel them erect through the fabric of her bra. She reached into my boxers and pulled out my erect cock.
"I think I need to sharpen your pencil a bit." Gill picked up my pencil and a pencil sharpener. Lifting the bottom of her bra slightly she let my cock slide up into her cleavage, trapped by the bra. Then she started to slide the pencil in and out of the sharpener whilst moving up and down, rubbing my cock between her tits.
She stood up again and moved away.
"Now, breasts are often best displayed from underneath a girl as it allows them to hang down beneath her. You can then grasp them firmly or play with her nipples or even watch them bounce and swing as you slide your cock into her pussy." She turned side on and bent over. Then she stripped off her skirt and beckoned to me.
"Jon, come and stand behind me with your hands on my hips." I did as I was told and found my erect cock very close to her bum.
"Now," she took a step back to grind her ass into my cock, "reach over and unhook my bra." As I did her breasts sprung free and hung below her. "Now reach your hands round and feel my tits, oh yes, that's it, feel them good! Now move round the side to get a good look at them and then fondle me some more. Ohh, ohh, oh yes that's good. Feel your teacher's titties, oh yes, grope me hard. Ohh, ohh, oh yes! Go and lie on that table and I'll show you another use for my breasts."
I lay on the table and Gill came over and walked up in between my legs. Then she knelt down so that her tits were level with my cock and enveloped it in them. She pumped my cock up and down, using my precum to let it slide through her tits.
Suddenly she got up and I sat back in my chair. She picked up a vibrating dildo and came back over. Turning away from me she bent over stripping her panties off so that I got a good view of her tight ass and her cunt lips. Then she climbed onto the table and slowly pushed the vibrator into her pussy. Her back arched and she managed to gasp out "this part, ahh, oh yeah, is an investigation, oh yeah, you, mmmahhh, get to play with my titties. Use them, oh yes, however you like ahh."
I pinched and sucked her nipples making them hard as bullets. Then I climbed onto her and she held her boobs together for me to fuck. "Oh yes Jon, that's it, fuck my titties. Ohh you're so good, ohh yes, I want you to cum all over my hard nipples Jon, mmm, ohhh, I'm going to give you an A* for this class, oh yes!" I slid into her velvety cleavage and fucked her tits until I came all over her chest.
