Only just.

James was on the very edge of climax. For all he knew, he had been for hours, all sense of time lost under the **** of pleasure and arousal. The shadows in his room shifted as the sun moved across the sky, but James barely processed that as he sat, panting and groaning, eyes barely focused as he fought his overzealous libido. More than once, he came close, so very close to rip apart the thin string around his wrists, feeling it dig into his skin as he began to pull.

But 18 years of his mother's strict parenting now bore fruit, an almost pavlovian need to obey having grown within James. Only now, there was a distinctly sexual dimension to it, making James' cock tingle and his nuts churn as he thought of how proud Anne would be when she found him in his room after an entire day of holding out - yes, he would very likely have shot his load all over the room, but the string would be unbroken.

It was this thought and this thought alone that let James hold on. The only thing stronger than his need to blow his load, jerk off until he came violently, play with his titties in the afterglow was his desire to make his mother proud. But it was decidedly not easy. His hips bucked a fraction of an inch at a time, driving James' cock through his cleavage and making his boobs jiggle, stiff nipples bobbing in the cool air, sadly not doing much of anything. Sensitive as he was, the minuscule movements only served to increase his frustrations. His nuts were roiling with cum, churning almost audibly as they pumped thick globs of pre out of his trembling, straining member.

The thick fluid was already soaking into the pillow James was sitting on, after oozing down his entire shaft, slickening his cleavage and covering his giant nuts. Almost every inch of James' front was covered in sticky pre by the time he felt his mind begin to buckle under the mind-rending bliss. If this went on for much longer, James wouldn't be able to care anymore, about tests and Anne and sex and his mother's perfect ass and her awesome tits and how they would rub against his trembling shaft when she straddled his nuts, squeezing out more and more pre as her tongue swirled over his tip... he'd snap the string after snapping himself, fuck his titties with abandon, jerk off frenziedly and blow his load all over his mother who was standing in front of him, arms crossed under her breasts and gazing down at her son with an undeniably warm smile.

"Well done, little pervert. So very well done." James could barely focus his eyes as he looked up at his mother - was he hallucinating? Was the test really over? Had he made it?! "Just look at you. Your cock's swollen even more obscenely together with your balls... These ridiculous breasts quiver with every breath... And all this pre..."

Anne's nostrils flared as she drew a deep, shuddering breath - and James could see her nipples stiffen under her thin shirt, fat nubs poking into the fabric.

"You absolutely stink of it. And yet..." James stared numbly as his mother rounded him, stopping directly behind his back. "The string is still in one piece. But I'm sure the pleasure is about... to break you..."

James whimpered, unable to even talk as he felt Anne sit down behind him, scooting closer until her breasts pressed against his back and her breath tickled his left ear. The touch alone made his cock jump, flinging thick pre onto the floor.

"Then let mommy help."

One of Anne's hands slid along James' side, under his left breast and towards his turgid pole, the other sliding over the swell of his right breast, its target the angry purple glans - but neither of his mother's hands made it to their intended goal.

"Muh-muh-MOMMMEEE!" With a loud 'glorp', cum exploded from James' cock, thicker and more voluminous than ever before. Hours of holding out, of sitting with a raging erection without release had concentrated his semen which was now spraying uncontrollably from his shaft as his hips bucked, his balls contracted again and again - and when Anne finally got hold of the wildly twitching cock, James' climax only intensified under the skilled ministrations of her firm fingers. "Mo-o-o-ooom!"

"Yesss, little pervert. Cum for me. Cum for mommy. Cum hard and spray your nasty jizz all over your room." As her son's body twitched and jerked with every thick, jelly-like rope of sperm bubbling up from his oversized balls until it fountained from his bulbous head, Anne kept egging him on, massaging and stroking his shaft with both hands. "Show mommy how long you can keep this up..."

As it turned out, for several minutes. Although the frequency of his shots quickly diminished, it took the hopelessly overtaxed James much longer than usual to come down from his climax, another shot jettisoned from his massive cock with a full-body twitch whenever he thought it was finally over. He had lost all strength towards the end, collapsing backwards against his mother who held him up and cooed encouragingly, even stroking his hair with one hand while her other stroked her son's cock.

"That's it, my little pervert. That's it..." Finally, the intensity of James' shots began to wind down, globs of thick cum now only oozing from his urethra and down his shaft. "All your naughty cum... all for me..."

James was beyond exhausted, all his mental energy drained by the test, his entire strength gone into one single climax. As his eyes fell closed, James felt his mother's fingers slide over his slowly wilting cock, gathering up syrupy globs of his sperm. As his mind slipped into a deep, dreamless sleep, James thought he could hear lewd slurping and moaning.