The look Mark was giving her had made her worry slightly though, she was afraid that Mark might learn to love oral so much he'd want to stuff her throat every chance he got. She could get things done with a cock in the ass but it was just impossible to get anything done when men were throatfucking you. Still, she wasn't willing to change her mind just for the sake of convenience.
He'll have to be satisfied with just my mouth.
Mark pulled back out to let Susan recover. Spit and mucus trailed from Susan's tongue to his cock as he did. Susan kept her mouth open and panted like a dog to catch her breath. When Mark thought it was long enough, he slowly fed her his cock again, each repetition giving her another inch here and there until she couldn't handle the meat filling her throat and choked again. Eventually, he was buried down to the balls back in her throat again and loving every second of it, especially since his mom had pulled out another trick and stuck her tongue out further to lap at his balls whenever her nose was pressed against his pubes. Lost in complete bliss as his mom swallowed repeatedly and licked at his sack, Mark drove his cock in as deep as he could. He pressed Susan's nose into his crotch so hard it almost hurt and stayed there, savoring the feeling of his mom servicing his cock.
This time though he remembered his mom needed to breathe so reluctantly pulled off after a while and eagerly waited for her to recover before sensually feeding her his cock again and again. Mark watched, mesmerized as Susan's throat bulged to take his cockmeat and closed his eyes to enjoy what Susan was doing.
Suddenly, remembering when one of his friends bragged about what his mom would do when she was deepthroating him, Mark wanted to see if Susan could do it too.
Mark looked down at his mom and asked while still completely inside her throat. "Mom, one of my friends said his mom could actually swallow his balls when she deepthroated him, I thought he was just making stuff up, people can't do that can they?"
In reply, Susan nodded slightly, as much as she could with cock filling her throat.
Heart thumping inside his chest at, Mark asked, hoping fervently. "Can you do that?"
Susan hadn't done that for anyone in some time and worried she'd be out of practice but thought she could at least try for Mark. Pressing her faced even harder against her sons pelvis, she stuck out her tongue and tried to use them to swallow his balls but couldn't quite manage it. Deciding she needed to use her hands, Susan finally unclasped them and moved them from between her lap for the first time. She gently handled Mark's balls and fit them into mouth; incredibly, she managed it on her first try, filling her mouth with Mark's ballsack, giving her a chipmunk look.
The sight made Mark shiver with delight and was the hottest thing he had ever seen, he immediately knew he was about to cum. Swapping from the slow, sensual throatfucking he had been giving her, Mark went back to the rabid skullfucking he gave her before, eager to dump his cum down her throat.
Grabbing the sides of Susan's head, he threw it back and forth on his cock, using it like a toy to get off with, making Susan gag and sputter horribly. "I'm gonna cum," Mark grunted out, moments before driving his cock hard down her throat. Susan knew just what to do and expertly resumed swallowing and licking Marks balls to milk out his cum, hoping to make him cum soon so she could breathe.
With his mom's nose buried in pubes, Mark shot massive, endless spurts of jizz straight down her throat.
Susan tried to swallow what she could but Mark's load was overwhelming, practically drowning her with its volume. She couldn't help but cough, sending cum back up around Mark's cock despite the seal it was making and out her nostrils messily.
Coming down from the mind blowing orgasm he'd had, Mark slowly pulled his cock free of his mom's mouth and was shocked seeing how sexy she looked. Her cheeks were streaked with running mascara, cum was trailing from her nostrils while spit and more of his semen was drooling from her mouth, she looked perfect to him. While Susan coughed and gasped for air, Mark thanked her profusely. "Mom you were incredible, that was the best thing ever."
"You're welc-" Susan said with a wet, phlegmy voice before clearing her throat and trying again. "You're welcome honey. I'm glad you liked it, maybe now we can put this whole anal business to bed?"
While still disappointed his mom wasn't letting him have her ass, he supposed he could live with this for now and nodded in acquiescence.
~~~
Later that night while she was getting ready for bed, Mark came into her room looking like he had something to say. Susan couldn't say she was surprised, she figured he probably wanted to use her throat again. She expected he'd be asking all the time now that she'd agreed to let him have a taste of what Free Use would be like. She of course could still turn him down since the law only covered those 18(21) and up but found the idea too cruel to actually go with now that she'd given him a taste.
I suppose I'll just have to deal with this for a few more years.
"Hey mom?" Mark said, slightly embarrassed to be asking again so soon after their last session,
Susan gave her son a knowing look. "Did you want another turn in my throat honey?"
Mark just nodded eagerly.
Putting down the book she was reading, Susan got ready for another session of manic throatfucking. She laid down and moved over to the edge of the bed so her head hung off the end of it upside down. This was always her husband's favorite way to use her throat; she figured Mark would probably enjoy it too.
Mark for his part was still inexperienced and didn't know why his mom had maneuvered into that position. "Mom, what are you doing? Why are you lying like that?"
Susan chuckled lightly at her sons inexperience. "It'll be easier for you to use my throat like this honey, your penis won't have to bend and can just go straight down. You'll get to use my mouth like a pussy too, trust me you'll like it this way too dear. Just remember to let me up for air every once in a while Mark."
"I will mom, I won't forget." Accepting his mom's experience and eager to try it out, Mark quickly took off his pants and made his way over. Once near, his mom opened her mouth for him invitingly. He took aim and guided his cock into her wonderfully warm, wet mouth where he belonged. Pressing in, he found that she was right; his cock didn't have to bend as it went down her throat, making the throatfucking feel even better.
Remembering what his mom said, Mark began fucking her mouth like it was a pussy, using his hips to drive in rather than grabbing her head. It felt viscerally better moving his hips and pressing his weight into his moms face rather than using his hands, he definitely preferred it this way. He liked how he could watch his moms throat bulging as his cock made its way down it, or the way her body arched and tensed when she choked on his meat. It felt so good and natural to just push all his weight against his moms face, driving it hard against the mattress when he buried himself in her throat and left it there. Closing his eyes and savoring the familiar feel of his mom's throat wrapped tightly around his cock, Mark absent mindedly reached under her nightgown so he could play with and squeeze her tits, momentarily no longer thinking of her as a person, but just a set of holes to enjoy and soft mounds to squeeze. Mark was in heaven while Susan choked and her lungs burned for air.
As he stayed inside her, he saw Susan had stuck her tongue out again and was licking the top of his cock. It wasn't very sensitive there and he didn't feel all that much as she did it, but Mark was so grateful his mom was so caring she'd go the extra mile like that, she really was the best.
Remembering the other thing his mom said, Mark only spent a minute or two fucking his moms throat before he let her up for air. The minutes went by all too quickly for Mark but felt far longer for Susan. As experienced as she was, being throatfucked with 8 inches of cockmeat wasn't something anyone could handle easily. Every so often when Mark got too energetic and forced his cock in without giving her throat the chance to open up, she'd gag and cough, sending saliva and mucus geysering up past Marks cock where it would run over her nose and down her face in torrents. In just those 2 minutes of throatfucking, Susan's face was completely drenched in her own spit. Mark didn't notice or care as he made a mess of his moms face though, lost in his own pleasure as he pounded it.
The next quarter hour went by slowly for Susan as Mark used her throat with all the vigor of someone new to Free Use. Stars appeared in the corner of her eyes as Mark leaned his weight into her face, smothering her with his cock. She knew he was close because he was spending longer and longer without letting her up, soon enough she knew she'd have to start pushing the boy off if she didn't want to black out. It annoyed her slightly that Mark was almost suffocating her with his cock but she reminded herself that boys will be boys and tried to be a good sport about it.