I've been thinking of my stepdad ever since I heard him and my mom have sex.

I didn't try to listen at first, but I heard my mom moaning and my stepdad screaming the hottest things.

He kept shouting "I'm filling you up and you'll cum for me"

And as soon as I heard this, I was so turned.

She has been married to Laken - my step dad, for 3 years and we have been fine. I walk around the house wearing tank tops and spandex and I catch him staring at my breasts a lot.

Often times I snuggle in their bedroom between my mom and Laken during midnight, whenever I find it hard to sleep. A couple of times, he has pulled me against his crotch thinking I am not his stepdaughter but my mom.

That's not the problem. But one night Laken was sexually frustrated to all hell and tried to fuck me in his sleep.

The first time it all started, I didn't really know what was going on. We were watching a movie after my mom had gone to bed, and I had my feet in Laken's lap. He's never been the biggest fan of Disney, but I love it, so we were watching my favorite one.

He fell asleep not long after the second opening song, and things progressed like they usually do. I wiggled my feet to the lines that I knew. Things were going normally.

And then Laken got hard between my feet.

I'm going to assume it was a combination of the way I was wiggling my feet and the fact that he hasn't had any kind of sexual contact since a few weeks, as my mom arrives home late night so tired that she straight go for sleep. I hadn't hear any voice from their room.

But one moment I'm wiggling my feet and humming along to the song, and the next my feet are brushing against something hard and fabric covered.

When I looked down, I was more than a little surprised to see Laken's cock trying to break out of his sweatpants between my feet.

I scrambled off his lap and just watched him in shock. His hips moved a little bit, maybe searching for me, and his cock twitched in his pants, but that was it. I kept watching as his dick slowly deflated, and by then, the movie was over.

I left him on the couch that night, and when I saw him the next morning, I didn't bring it up.

I thought that was a one time thing.

The second time it happened, my mom and her church partner overpacked the church van for a trip to the water park. Laken had been working a lot recently, pulling doubles to try and make that month's quota, so he was exhausted. When Mom shoved him into the van and told me to sit on his lap, I didn't think anything of it.

I just sat down to face the seven-year-old next to us, leaned my back up against the window, and tried to pretend Laken's swim trunks on my bare thighs weren't making me feel gross.

"Your mom still makes you sit on your dad's lap?" The kid next to us had asked, that specific kind of disgust only a child can possess on his face, and I laughed.

Laken gave a tired chuckle where he was resting his head on the window near my shoulder.

"Would you rather sit on his lap?" I retorted, teasing him on purpose, and he along with all of the other children in our row gave a chorus of 'ew's.

I laughed at them, and Laken laughed, too, but that was it. I'd soon be glad it was me on his lap and not one of them.

Once we reach the park, I waited until all of the kids had gotten out of the van and followed my mom into the park before I got off Laken's lap. I waited until his dick calmed down before I woke him up to avoid any awkwardness.

A few hours later, we came back to our van. Most of the kids slept on the way back.

We sat where we were before, and kept our voices low while talking so that kids don't get awakened.

It's as we were going over speed bumps in a school zone that Laken's cock made a reappearance. I'd just liked a tweet from one of my friends when I felt a growing hardness on the underside of my right thigh.

Each speed bump we went over made that hardness the smallest bit more pronounced. As we kept going, the minute rumbling and rattling of the van kept the pressure consistent, and soon, that weird hole guys piss out of was shifting, and Laken was hard as a rock between my thighs.

It took me a second to process the fact that there was a warm, hard cock between my thick thighs, and it took me a second longer to process that it was my stepfather's.

I sat perfectly still in shock much like the first time he'd gotten hard between my feet, but this time, there was no fabric to prevent him from touching my skin.

Each pothole in the road--though my mom did her best to avoid those--was like the smallest thrust between my thighs.

Laken's cockhead was hot and bulbous where it was pillowed in the skin of my thighs, and my heart started to race.

The forbidden nature of almost riding my stepdad's cock in a church van while my mother sat just two seats ahead of us was tantalizing, and the fact that Laken was sleeping made it even more exciting.

I clenched my thighs a little tighter around him, and he gave the quietest grunt where his face was pillowed in my shoulder.

I was already wet.

I was already wet for my step dad.

His cock engorged and twitched several times, each twitch accompanied by a hard burst of cum between my thighs.

It was over so fast that I didn't really have time to enjoy it, but that was okay. I got enough pleasure out of knowing what had just happened, and knowing Laken wouldn't know.

He softened between my thighs, and after making sure the kids around us were still sleeping, I reached the towel over my lap between my thighs to try and clean myself and his dick off.

I slipped him back into his swim trunks after that, and when my mom dropped the kids off, I slid off his lap.

He didn't know, and I didn't talk about it.

It didn't happen again for a while, and the next time it does, I'd already kind of been expecting it.