This is the third in a series, it will make more sense if you read "Fountain of Youth - Discovery" first, "Fountain of Youth 2 - Experiment" second. Sorry it took so long. Opinions and constructive criticism always welcome.
*****
At first Jeremy returned to gently stroking his mother's pussy and clit while tweaking her nipples, drawing her to shuddering orgasms. Soon however he moved on to more perverse tests of her limits. Sliding his middle finger firmly into his mother's tight ass, being sure to continue the slow elliptical orbit around her clitoris with his thumb, Jeremy leaned forward and whispered in his mother's ear. "If you don't like it Mom, all you have to do is say something...or not come." At the last word he gently ran his tongue around the edge of her ear, proceeding to gently nibble the sweat slicked neck.
Exhausted from the almost 2 hours of exertion and stimulation Abby's body no longer had the strength for forceful orgasms and screams, but as the tingling sensations cascaded from her son's gentle teeth down her spine to mix with the rhythmic throb of his finger in her ass a warm rolling pleasure rippled through her and caused a soft sobbing moan to part her lips. Feeling more powerful with each passing moment Jeremy drew further on his extensive readings about sex and orgasm. Removing his finger and wiping his hands on the washcloth the young man prepared for his next depravity.
"OK Mom, I think you are really going to like this one." His mother was no longer pleasuring herself actively, nor did she seem to hear him. Her head lolled from side to side, eyes barely open, as her hands absently caressed her torso and breasts. Jeremy placed his hand back at her crotch and began the gentle manipulation of her clitoris once more. His mother's body almost immediately fell into a gentle motion, rocking her hips in time with his strokes. Minutes went by and as Jeremy began to see the now familiar signs of his mother's climax he firmly placed his hand on her throat and squeezed. Feeling the sudden constriction Abby's eyes fluttered open and slowly focused on her son's gently smiling face.
"It's OK Mom. They say this is the most fantastic orgasm you can have." Confusion clouded the slightly matronly face, attached awkwardly to the body of a plump 20 something girl. Her cheeks began to darken, at first almost like a blush then further into a purplish hue. Abby's breath was now sounding ragged as the constriction made it hard to breathe. Panic began to surface in her now widening eyes. Abby's arms tried to push away her son's grip, but exhaustion and the already advanced lack of air made her so weak she could barely put up the effort. Vaguely she realized her hips where still grinding and pleasure was still sparking between her legs. Her vision began to tunnel down to just her son's face and the sensations of panic and pleasure whirled in a confusing storm. Just as another ripple of orgasm threatened to overtake her Jeremy released her neck and with a giant gasp of air her world exploded. The colors of the room brightened almost painfully, the sounds of her own gasps and moans rang in here ears like a stadium sized orgy. Everything she saw was surrounded but a whitish halo, and in the middle of it all was her son's smiling face looking into her eyes. There was too much light, too much sound, too much pleasure, and not enough air. After the most powerful bolt of pleasure she had ever felt finished crashing through her, Abby tumbled into blackness.
Abby awakened when something cold and slimy hit her face. "Pfft! What the...!" She tried to roll away from the unpleasant sensation but found herself unable to move.
"Relax mom, I am just finishing up a few things.. Don't struggle, you were sleeping pretty hard, so I took advantage of the time to make sure you wouldn't do anything stupid when you woke up." As he spoke Jeremy continued to spread the cold cream on her skin.
"Jeremy! What do you think you are doing? Untie me and get out of my room!" What appeared to be a fairly secure combination of rope, sheets and towels held Abby to the bed, but in an attempt to bluff her way out of her predicament she put as much authority in her voice as possible.
"Just a sec," Jeremy spoke absently as he craned his head from side to side looking at his mother's face like someone inspecting an almost completed masterpiece. He squeezed another dollop into his hand hand and spread it liberally under her chin and neck as she did her best to squirm away from his touch.
"I said untie me and get out!" Abby spoke louder but as memories from before her blackout began to reform in her mind, panic was beginning to creep in.