Confront her with my suspicions.

I decided to confront her with what I suspected. I went to her office the next day to meet with her privately. As I closed the door after telling her that I had something important to talk about I noticed that she seemed nervous and embarrassed. As I explained to her about the cameras that I installed she became more and more nervous.

"I am sorry if I am upsetting you", "I told her "I just wanted to talk about what one of the pictures that cameras had taken."

As soon as I said that she said, "You had no right to film me without my permission."

I took a leap and asked directly, "Do you always masturbate in public?"

I thought she was going to blow up in my face and throw me out of her office, but instead she collapsed in her chair, eyes downcast, and said "I have a problem."

I waited for her to continue and she did. "It started about a year ago. I have an uncontrollable urge to cum during the day. When this feeling develops I have to masturbate myself to orgasm, or I can't think. It is an overwhelming urge that builds up inside of me."

I went out on another limb and asked, "You feel like that right now don't you?"

Yes, she whispered.

"Show me" I said.

As if in a trance she raised her skirt and pulled down her panties revealing her black, furry bush. Her pussy lips were swollen, no doubt from some self stimulation she had engaged in earlier in the day. She flipped off her panties and hiked up her skirt a little bit so she had easy access to her cunt as she sat down. She closed her eyes and began to run her fingers up and down her cunt crack. Her fingers became wet and slippery with her lubrication as she stimulated her pussy.

My own cock was hard and aching in my pants. "Can I jack off while I watch you", I asked.

She eyes opened in surprise and she moaned out, "Yes, show me your hard cock."

I unzipped my fly and freed my raging hard prick. It was already coated in pre-cum, and I slid my hand up and down its hard shaft, bringing myself to full erection.

"God, your cock looks good", she said as she stared at my hard pecker and continued to rub her pussy.

Her nipples had popped out hard and stiff. She raised her left hand and pulled her nipple through the fabric of her blouse. She undid a couple of buttons on her blouse and pulled her right breast out of he bra so she could stimulated her long, pink nipples with her left hand.

Her right hand was busy stroking her cunt and clitoris. She was breathing harder now, and she looked like she had the day that I surprised her. She was very close to orgasm.

My own hand was pumping my hard cock, as I watched my sexy teacher work over her wet cunt. Then suppressing a loud moan she brought herself to climax. Her whole body shook, and she pulled her exposed nipple hard with her one hand while frigging her clit with her other. Her cunt was swollen and her pussy lips hung open revealing her pink twat. She looked as sexually exciting as anything I had ever seen.

My own cock was ready to explode, and I brought myself to peak as I watcher her cum. I stood up and air fucked my hips, pumping my cock as I ejaculated a long stream of cum onto her desk top. My cock spewed a couple more streams, and I collapsed back in the chair.

We looked at each other for a second then she said, rather calmly, "You can see my problem."