"God," I moaned loudly, allowing the word out, certain that my husband would still think I was desperate to pee, not knowing that immediately behind him I was unable to restrain my vocalisations not because of hydraulic pressure, but because my orgasm was hitting me like a thunderstorm, my cum gushing out of me and flooding onto my son's cock and lap. Again I grabbed the driver's seat and pulled myself up, my son's cock finally exiting my overheated pussy.

Thankfully thoughts of incestuous sex never occurred to him. Why would it? I was in the backseat with my son as Alex reassured me, clearly concerned only about my bladder, "Thirty seconds, honey."

"Okay, thanks," I replied weakly, as my now unstoppable orgasm continued ripping through me like a tornado.

I could feel my son fumbling underneath me, likely putting away his cock, which I realized I still hadn't seen.

I just closed my eyes and allowed the tornado of pleasure to spin through me, an orgasm as intense as any I'd ever experienced. Partly because my son's cock was bigger than my husband's; partly because of the taboo fact I had just fucked my son; and partly because of the crazy reality I had just fucked my son in a car with my husband mere inches away.

When he pulled in and brought the car to a stop, my orgasm still wasn't complete. Yet I had to appear urgent, desperate even, like I could pee myself at any moment, so I slammed open the door, cum running down my legs, and jumped out of the car, glancing back as I began running to see my son grinning at me, his package safe and sound in his shorts... although a very clear wet patch providing visible evidence of our wrongdoing should CSI show up to investigate.

I scurried through a rustic restaurant and into the washroom, the guilt and shame of my indiscretion and incestuous act suddenly hitting me like the summer heat.

I... had... just... had... sex... with... my... son!

In... our... car!

With... my... apparently oblivious husband... inches... away!

Oh... my... God!

I... am... the... worst... mother... ever!

But worse yet?

It had been fucking amazing!

I may have been a bad mother, but I was a very good Mommy!

We ate lunch, and although I was anxiety-riddled the entire time, my son had a poker face as he gave away no sign of what had transpired. I, on the other hand, had guilt written all over my face.

Twice Alex asked if I was okay.

I just feigned hunger and exhaustion from needing to hold my pee for so long.

After lunch, and a lot of water, we prepared to continue the drive.

Alex had gassed up while I was in the washroom, so we were ready to go.

Again, my trepidation overwhelmed me.

Now what? How could I sit on Cory's lap again?

Yet, I couldn't say anything; there was literally no alternative.

So, I sat. Although this time, once the door was closed, I positioned myself leaning against the door and stretching my legs between the two front seats. My pussy was out of range in this position. I had found the Fort Knox of pussy protection.

And for an hour it worked. Cory read the new James Patterson book and I read the other new James Patterson book (he apparently puts out a new book more often than the Red Sox lose another game). Interestingly, Cory and I had a lot of common interests, including being avid readers and both having the same favourite author in James Patterson.

Sit in any single position for a straight hour though, and the rear becomes a mutineer. Yet, even though I was very uncomfortable, I refused to reposition myself, although I did begin to squirm a bit.

Suddenly my son's hand was resting on my knee, my dress hiked up enough to show him a fair amount of leg.

His hand didn't move up my leg, it just rested there as a constant tease... a constant reminder.

He did move his hand away to flip a page every couple of minutes, although he didn't replace it any higher when he returned it.

He seemed oblivious to the impact it was having on me, a constant distraction, even though it wouldn't have fazed me at all a few hours ago.

"How you guys doing back there?" Alex asked a few minutes later.

"My bum is numb," I joked, although it was the truth.

"I certainly hope not," I purred, trying to look sexy and with improper intent.

A couple of minutes later, deep enough in the woods that we couldn't be seen, I dropped to my knees and fished out his cock. I'd considered letting him fuck me, but I didn't want him to see I wasn't wearing any panties.

He gasped, "Sarah, really? Here?"

"You always say you wish I was more spontaneous," I quipped, although if he knew how spontaneous I'd already been today he would likely keel over. Plus, although we had a reasonable amount of sex together and I was willing to try almost anything for him in the bedroom, anywhere else I wasn't much of a risk taker. Normally.

But today my typical insecurity, or the idea that sex was only for the bedroom, seemed to be shattered after the exhilarating, taboo sex I'd enjoyed in the backseat of our car. I now wanted to take risks.

Before he could say a single word I took his flaccid cock in my mouth. I love sucking cock... always have. I was a bit of a cock sucking slut in high school, figuring it was a good way to save my virginity for marriage. Plus, I was good at it and even enjoyed the unique taste and texture of cum. Of course I ended up not saving my virginity after all, getting fucked by an upperclassman at the first college party I went to.

"Oh shit," Alex groaned, "what's gotten into you, Sarah?"

The answer to that question was 'your son,' but that didn't seem like a prudent response.

I pulled his cock out of my mouth and asked, "Can't a wife show her husband she loves him by giving him a little surprise? Like spontaneously sucking his cock and swallowing his load?"

"Yes, she can," he laughed.

"Plus I'm hungry, and your cum can provide a lot of healthy nutrients for a girl's body," I quipped, taking his organic whole-grain-fed cock back in my mouth.

"And it's good for your complexion, too," he added, having read somewhere that cum was good for a woman's skin and had used the argument to give me the first of his many facials years ago.

While I'd rather swallow a load than take it on my face, since I was rather submissive I always just allowed Alex to shoot his load wherever he chose.

I protested, for the first time since my first-ever facial, "Don't you dare. Not here."

"What? You think Cory would be shocked?" he teased, sliding his cock back in my mouth.

I thought to myself, If you only knew. Yet I kept bobbing, feeling exhilarated to be doing it in such a public place.

"You wish," I quipped back, even though I assumed we would indeed be fucking tonight, and given how submissive I was, I knew I wouldn't keep him away from my ass, if that's what he wanted.

"No, I don't wish, I know," he said, slapping my ass.

I went to the washroom, washed my face and went pee.

I grabbed a Gatorade and a chocolate bar and returned to the car.

My son and husband were leaning against the car, chatting. I wondered how weird it would be if they were chatting about sex.

I joined them and asked, "Ready to go?"

"Sure," Cory said, before adding, "ready to endure sitting on my lap for a couple more hours?"

"Ready to have your mother squishing you for a couple more hours?" I countered.

"It's been a tight squeeze, all right," he countered, smiling at me for the first time since our shocking act.

I laughed, trying to act casual, worrying that my husband might somehow sense the sexual tension between his wife and son, "Yes, it's like a hot box back there."

Cory laughed, "Yes, it's a sure-fire weight loss program."

Alex apologized to us both, "I'm sorry we didn't plan this better."

Cory joked, repeating an earlier statement I'd made, "It's enabled some special mom and son bonding."

"Well, get ready to bond some more then," Alex said, "It'll be a good two or three hours until our late supper stop."

I couldn't help but laugh, but also to feel mortified at the sordid bonding activities my husband was tacitly approving, especially when my eyes wandered to my son, who was gazing hungrily at me with a big smile on his face.

We were back in the car, I was back on Cory's lap, this time perched on his right leg, leaning against the boxes.

Like the last time, he just read and ignored me for the first hour. We could have talked about anything with each other since Alex had the radio blaring again, but we didn't.

But as I began to fidget, again feeling antsy, he asked, "Uncomfortable?"

I nodded.

He nodded, "Me too," and promptly pulled his cock out of his shorts. "There, that's a lot better."