I literally nearly fainted, and had to lean against a bookshelf for support. Nicki glanced around to make sure no one was looking, and touched my lips...for a second with her forefinger. I know that I whimpered audibly. I felt drunk, weak... and a trickle of naughty wetness slid inexorably down my inner thigh."I can finish here in a few minutes. I only live round the corner. If you've got a little time... we can give each other a hand..." She said, moistening her mouth.Mum was picking the boys up. This followed on from two days of sheer panic, of forming ridiculous plans in my mind of how I could undo what I thought I’d done. Fifty minutes into the lesson he calmly strolled around the tables, dropping books in front of their owners, til it seemed that only mine was left in his hand. By this time I was wondering how fast I could get the window open and jump out! My notebook thudded onto the table in front of me, I shut my eyes but he strolled away and continued talking. When the bell rang. I stood in front of her and let her watch me pull the chain through my hand until the clipped end entered it. I took it in my fingers, held it in front of her face, and opened the clip so she could see it. Her eyes widened.“Be still. Don’t even flinch. I don’t want to feel your body move,” she heard me say.Taking the clip, I reached in between her legs, pinched her left side outer labia, and gently attached the clip. Just as I ordered, she did not flinch. Slowly, I ran the chain again through. "Now you'll get to earn your keep."He stood up and I fell off of him and onto my boots, my cock hard inside my new pussy."On your knees sweetheart." He said as he pushed me onto my knees in front of him.I did as I was told as he unzipped his jeans and pulled his huge cock out for my eagerly awaiting mouth. I took his head gently in my mouth and lightly rimmed the head with my tongue. Then I began working up and down the shaft before engulfing his cock down my throat. He held the back of my head.