“No” she answered, tightening the relentlessly gyrating thighs which gripped your helpless cock as punishment for your persistant pleading. “Not until you awnser the question”
You wailed in frustrated misery while the rhythmic edging continued. Every moment that your cock was held between those soft, slippery, pillow-y legs robbed you another IQ point. How long had it been now? An hour? A day? 5 minutes? Time was a blurry fuzz which slipped away like cum down a sinkhole every time her plush arse bounced against your hips.
“I’ll ask again, What is the transformation matrix for a rotation around the y axis of a 3D basis? Come on, I know you know it” She was slightly out of breath, she had been for as long as you could remember now. The slight current of short breath was an odd mix with the tone of a strict teacher, every word or hers felt like she was scolding you for being so stupid. “We JUST went over it”
You’d been edged for too long. Your cock was screaming and throbbing, oversensitive and overwhelmed, practically spraying pre-cum each time her thighs pumped it. Your bloated balls ached and sagged with a heavy longing to be emptied. This reward based revision session had quickly turned into a terrible, inescapable trap. Like an ant in a pitcher plant, your hopes of answering the question and being allowed to cum seemed more and more futile; You could barely remember your name by now, what was she even asking you?
Sounding quite like a zombie, you began to chant an awnser from somewhere in your overwhelmed mind,
“Cos theta… zero … Sin Theta…”
“Good! there we go! Don’t stop” her words were encouraging but the tone of her voice was patronising, she sped up her hip grinding, as if to try and distract you.
“ Zero … one … zero…”
“Oh, you’re so close, so close, what a clever boy” Her voice became hushed and sultry, teasing, mocking, her hips bucked faster still, you could feel your orgasm swelling inside you, your prostate aching as it swole with fluid, your mind went cloudy like your very soul was being dragged to your groin ready to be shot out of your cock.
“Sin…. Theta …..nnggmhhh…. Zero ….. ahhhh …. COS THETA!” As the last words left your mouth, You practically screamed them in anticipation of your climax… a climax which was ripped away by the sudden stop of her thighs and a tightly gripped hand around the base of your cock.
“Close, but incorrect”
You cried pathetically. A few moments later she was slowly pumping her soft, wet legs again, your cock evermore swollen, your balls evermore aching and your mind evermore forgetful. “Let’s try that again shall we? I promise you, I won’t stop until you get it right.”
