Danny ran his hands over her body, fingering her curves with a smile on his lips. "Duffy says there's lots of secondary centers all over the body," he remarked. "Someday I'll learn more about them on you. Right now, I want to be sure I see what the primary ones do." He went back to her crotch.
He caressed her pussy lips gently, the light touch shooting fierce waves of pleasure through her and producing vigorous undulations in her hips.
She moaned happily. "Oooh, that feels good, Son! Mmmm!"
He ran a fingertip around the rim of her opening and she grabbed a taut stocking in each hand and pulled furiously.
"Oh…!" she gasped. "Oh, Danny!"
His fingers left her for an instant, and then she felt them stripping back the hood of her clitoris.
"Mmmm!" She bucked violently. "Aghhh!"
He coated the tiny organ with thick juice from her vagina and began to rub it. She lost all control of her actions, thrashing in her bonds and moaning loudly. The pleasure that flooded her was so intense it hurt, and a vast hunger grew in the mouth of her pussy. While Danny continued to massage her clitoris with the finger of one hand, those of the other hand returned to her labia.
"Don't get mad, Mom, but… Well, this was one of the centers." He slipped a finger up into her, twisting it back and forth and jabbing it in and out.
"Ohhh…! Ahhh…! I'm not… mad…! It is one…! Oh, Danny…! Son…! Ram it hard!"
He jammed the finger in to its knuckle.
"Use… use two…! Maybe three…! Omigod, Son…! Ooooh…!"
She felt a great increase in fullness and knew Danny had inserted more fingers. She slammed herself onto his hand repeatedly, her pleasure driving her past caring how she looked to him. She became aware of slippery strokes over her rectum.
"What's… that?" she panted.
"My thumb, Mom."
"Oh."
His thumb paused over her tightly closed anus and pushed. She felt her sphincter stretching to admit it and tilted her head back.
"Danny…! Aghhh…!" She cried out and let her ass flail on the hugeness of his buried thumb. "My God, Son! Omigod!"
"I got stuff up your vagina and your ass, Mom." His voice sounded horse to her. "It sure makes you move around!"
"God, yes! It's going to make me have an orgasm!"
"Yeah? Really?"
"Mmm…! Yes…!"
"Mom, he said the biggest stimulus of all was… well…"
She gazed groggily at her son. He stood erect, both hands hidden behind the forest of her pubic hair, his enormous cock jutting over her. The shaft pulsed and there was a strand of clear mucus dangling from the slit in the angry-looking head. His pubic hair was black and thick and she recalled with a shiver the great size of his balls. Suddenly she realized what he was hinting.
"No, Danny! Not that! No, for God's sake!" But why not? she asked herself in a flash of recklessness. Why not? That's part of it! "All right, Danny! He's right!" she conceded. "Go ahead!"
Danny trembled violently as he withdrew his hands. He seized the huge shaft and guided the head down to her cuntmouth. His face expressed wonder as his heat and hers mingled and she began to open to his pressure. She felt the head sink through the firm rim of her labia and glide slowly up the length of her vagina, that hard shaft stroking inward after it.
She thrust herself onto the intruding prick, her buttocks quivering and tight and her belly hard.
"Ahhh!" She bubbled with joy. "Ahhh!"
At her first movement her son's hips surged forward to drive his prick to its limit in her and his pelvic bone slammed onto the outer flesh of her pussy. He jerked his hips back, withdrawing the buried cock until the head lay just inside her labia, then rammed it home again. She cried out and flung herself onto the driving prick. Her son's thrusts accelerated and he banged violently at her.
"Mom! Mom! I can't stop!" A deep note of panic rang in his voice and he had an anguished expression on his face. "Mom! I didn't mean to! I just wanted to see what it did to you! I didn't mean to fuck you all the way!"
She saw the depth of his distress and urged him. She soothed him with a gentle urgency. "It's all right, darling! It's all right! Fuck me, darling! Go ahead and fuck me! It's all right, Son!"
His cock slammed back and forth savagely and her cunt flamed. She felt as if the shaft were crushing her tissues against the bony circle of her pelvis and his cockhead were displacing all her organs. His anguish had cleared, replaced by ecstasy, and his hands kneaded her waist and pulled her buttocks against his thighs.
"Yes, yes, darling!" she panted.
"Mom! I'm gonna…"
"It's okay, honey. Let it happen."
"Mom…! Mom…!" he croaked with excitement. Then, with a note of triumph, "Here it comes…! Unnnh…!"
His cock shaft pulsed sharply and hot jism seethed into her vagina, filling her belly with foreign heat. She clamped the rim of her cunt on his cock, squeezing with hard contractions and praying for her own orgasm. Danny broke into convulsive tremors and the great cock went limp and soft. He pulled it out instantly, great drops of sweat pouring from him.
"Mom!" he murmured brokenly and came around the table to hold her face. "Oh, Mom, I'm sorry!"
"Danny, baby," she whispered. "Oh, Danny! How did it feel, Son?"
"Jesus, Mom! Like nothing I ever felt before!" He grinned bashfully. "You got awful excited, didn't you."
I still am! she thought. She nodded and smiled. "You found all the spots, Son. There's still a lot to learn, though."
"There is?"
"Yes. Maybe I'd better teach you while all this is fresh in your mind."
"Would you, Mom?"
"Yes. You might as well untie me now."
"You know? That was kind of fun. Having you tied up, I mean. I like that."
"Well, maybe I'll let you do it again sometime."
"Oh, Mom! Would you! Please?"
"Yes."
"Promise?"
She laughed and hard thrill raced through her. "I promise."
"Wow!" Danny shouted.
He untied her quickly, and she went back to the bathroom, where she douched and washed. As an afterthought, she sprayed herself with her best cologne. When she returned to the front of the house, Danny was sprawled in an armchair in the livingroom. He glanced up at her entry, astounded at her continued nakedness.
"Time for more of the lesson," she said with mock formality.
"What are you going to teach me now?"
"Let's demonstrate instead of talk. Okay?"
"Sure."
She stretched herself along his body, straddling one of his thighs to let its hardness ease the hunger of her pussy and putting her arms around him. "Kiss me again, Son."
Their lips locked and her tongue probed for his. He explored her throat with his tongue tip and she writhed on him, her breasts scrubbing the sparse hair on his chest, her cunt grinding on his thigh. When she drew back to look at his face through a film of happy tears, she knew he was no longer fooled by the academic pretense.
When he spoke, his voice had a tone of new maturity. "Mom," he said very softly. "You just want to fuck with me, don't you."
She cringed. "Yes," she whispered. "I didn't until it happened, but I do now. Besides, there really are a lot of things you don't know yet."
"Yeah." He kneaded her ass and sighed. "I've dreamed I was fucking you lots of times. It never did turn out like today." A faraway look of bliss stole into his eyes. "Never wild like that was, Mom the second I stuck my cock into you I knew I couldn't stop. I knew I had to go all the way!"
"I know."
The telephone rang. Helen groaned and scrambled off her son. "Why don't you get it, honey? You've got to get your blood circulating again."
"Okay," he grinned, laying a hand on her belly for a moment before leaving her. In a moment, he was back. "Dad," he said. "Says there's an emergency meeting of the state highway engineers tonight. He called to say he'll be home the middle of tomorrow morning."