Many thanks to Deborah Fogt for editing and improving this.
**
Dr. Wood was so pleased with Kelly and her reaction. The hot mom quite openly asked for the thermometer, naming it properly 'the butt plug'. In her aroused state, obviously all Kelly's inhibitions were gone. Dr. Wood watched with a smile on her face as Jason put the thermometer slowly back into Kelly's asshole and started to fuck her again. The hot mom was double-penetrated again, skewered in both holes.
"Oh yeeessss! I'm so full and I love the feeling. Fuck me, please make me cum, mummy needs to cum!" Kelly begged shamelessly. Her pelvis continued replying with graceful coital motions as her moan began to increase in intensity.
"Yes, mom. I know that. I like seeing how you orgasm. I like how you sound when you're nearly there. I like the look on your face when you cum, mom!" Jason confirmed. His cock had filled his mom completely, stretching her, owning her quivering pussy as he began to fuck her with long fast strokes.
"Jason, when you get close to cumming I want you to tell me. Ok?" Dr. Wood reminded him.
Jason just grunted and nodded. Dr. Wood noticed Kelly was gripping the bed sheets in her hands to anchor herself during the intense fucking she was receiving. Her massive tits bulging out either side of her chest as they were squashed against the bed.
The double pressure of cock in her cunt and thermometer in her ass made Kelly's arms begin to feel weak, and finally they gave out, dropping her head and shoulders down onto the bed. This changed the angle of Jason's cock into her pussy and, as her breathing became more labored and the circling and movement of her hips sped up, Dr. Wood knew the horny mommy was close again. Really, at that moment Kelly let out a guttural moan as she pushed her ass back harder onto Jason's cock! Her entire body shook and convulsed as she came again! She was yelling pretty loudly, even as she buried her head down into the mattress in order to keep as quiet as she could.
"Your mom is very vocal! She was really enjoying cumming time and again. You are doing good... really good, Jason!" Dr. Wood praised him. For Kelly the only thing left to do was to close her eyes and give in to his big, fat cock, panting and moaning to spur him on. She was just so sexy and very naughty, enjoying herself. Dr. Wood could watch this forever.
Over the next 20 minutes Jason continued to pound his mom hard as she continued to orgasm! Her slick pussy was awash with her own cum. All the time lots of sound variation were coming from Kelly. Big deep breaths 'ooohsss', 'aaahsss'! Series of short punctuated moans and phrases 'Oh, yes, oh, fuck, yes, oh'. Kelly wasn't sure why, but she began to love saying the hot things. Jason loved those sounds too because each sound was associated with an intense pleasure sequence, a sequence now happening so quickly that it all became sort of one huge, lush orgasm for his horny mom.
"Turn your mom over on her back. Fuck her in a missionary position so you can watch her face as you plunder her tight pussy with your big cock!" Dr. Wood instructed Jason.
Jason did as Dr. Wood asked and flipped his mom over. She fell back on her elbows and Jason lifted her knees and spread them wide apart.
"Put his lovely big cock back in your hungry pussy, honey," Dr. Wood now instructed Kelly, staring into her eyes.
Kelly reached down and willingly took his huge, hard cock in her right hand. It was slippery from her pussy juice and she gently tugged on his erection a few times. Then she guided it into her wet, warm pussy.
"Ooohhh," Kelly moaned. Dr. Wood noticed that Kelly had become quite sexually liberated in the last few days. For the first time her arm glided around Jason's shoulder, while her other hand slid down his strong back and grasped his muscular buttock. She pulled him towards her, driving his cock as deep into her pussy as she could. "Uh, uh... your cock feels so good. Ah, ah...You're so deep inside me. Oh, oh... I like it!" Apparently, she was free of the shackle! Then she wrapped her legs over his thighs, so that she had better leverage and could grind her pelvis against his while she used her hands to pull him tightly against her. "Ohhhh.... I love you, honey," she whispered into his ear.
"Jason, suck on your mom's nipples...bite them...it'll help her come quicker and harder!" Dr. Wood said hoarsely. Jason readily obliged.
Leaning forward, his face pressed against one of her soft globes, he took the big nipple in his mouth. His hands were on her breasts, gently massaging. Like a hungry baby, he sucked powerfully on her breast.
"Oh, yes, suck my tit," Kelly hissed, cupping her hands around her son's head. "You love to suck my tits, don't you, baby?"
Jason just whimpered into her breast, greedy for more of her ample tit. He sucked as much of her breast as he could into his mouth, letting his tongue flick across her erect nipple. Her body squirmed and she pushed her breast tight against Jason's face. Then he applied the same treatment to her other breast, sucking on the very tip of her extended nipple before sucking it hard then deep into his mouth.
After several minutes, Jason grunted and got up on his knees and put Kelly's legs up over his shoulders. Dr. Wood know that he was getting in even deeper this way, eliciting deeper moans from Kelly. Her breasts bounced wildly as his cock plunged into her, her pussy salivating as it was repeatedly penetrated.
Dr. Wood watched as Kelly shuddered and ground her pelvis upwards to push against Jason. "Oh honey, you're so deeeeep inside your mommy. You're making me cum again. Uh, uh, yeeesss... I'm cumming! Uh, uh, I love you! Aaahhh yes," moans of female arousal filled the room as Kelly worked herself on Jason's cock flexing her hips faster against him. Her hand squeezed his ass cheek and her moans reached a higher pitch. Her body tensed and Jason felt her pussy pulsated. She orgasmed again.
At the same time Jason felt himself near to exploding. "I'm close, Dr. Wood," he said as he stepped down the pace.
"Withdraw your cock and cum over your mom's body, over her face and tits so she wouldn't get pregnant by you," Dr. Wood whispered.