She doesn't stop

I awoke to her stretching at the end of the bed, and playing with her new penis, which had grown by another half of an inch by this morning. She smiled at me, "your turn to drive..."

I stared at her cock, and then up at her, "Don't get too carried away with that thing... you already have a pussy..."

She giggled, "Go on and drive..."

I sat up and got behind the wheel. I pulled out of our little campsite and got back on the highway. I drove, and drove, and drove some more. It was gonna be at least another day before we even made it to Canada so we had to pass the time with podcasts and driving games. She would go back and forth between the bed and the front seat to find ways to tease or annoy me as the hours went by.

The weather started to get thick after awhile and we decided to pull over for a moment. I laid back in the bed and she instantly took it as an opportunity to plop that pussy right on top of my dick. I rarely ever saw her this happy to do all the work, and put my arms behind my back as she rode on top of me. She let out some moans as her dick hardened and started to flop up and down on top of my chest.

She out of nowhere started to absolutely slam her ass down at a ridiculous speed, like she was trying to get me to breed her or something. She put her hands around my wrists and took control as she dominated me with her hips. I started to moan out as I felt my orgasm coming. She leaned down, "Go on... make my dick bigger..."

I instantly gave out as she ground her hips while wringing my cock out for every drop. She purred and giggled as I panted beneath her, utterly defeated as she started to moan again. Her cock growing once again, by nearly two inches as I continued to cum inside of her. She was already average sized and she had only had her cock for a couple of days.

She let out a sexy moan as she pulled my dick out and started frotting out dicks together, "Fuck baby... I'm getting so big so fast... our dicks feel so good together like this..."

She was already getting close to my size. I nervously chuckled, "Yeah... that does feel good..."

She laughed, "Baby... I get bigger every time you fuck me..."

I didn't know what to say, "What should we do about that? I'm not just gonna stop having sex..."

She smiled, "Well... maybe you could try being on the receiving end more often... since I actually get something out of it now..."

I found myself getting horny at the idea of whatever the fuck was going on. I nodded my head, "Yeah... we can try... as long as you're okay with it..."

She laughed, "Babe... I am sooo okay with it..."

I nervously chuckled as the rain started to clear. I sat back up and got back on the road. I drove for the next 8 hours, and stopped about 4 hours away from the border on some parking lot along a mountain range somewhere south. Before I even turned around, she was pulling me towards the bed, "Babbbeeee... come on I wanna put it in you!"

I let out a yelp as she flung me onto the bed and bent me over, "You ready babe?"

I rolled my eyes, "Yea- Ow!"

I winced in pain in realization that she was lot bigger than her dildo already. She started to moan just from sticking it in, "God you're tight!"

I let out a rather feminine moan underneath her and felt my pants in the relationship slip off quite a bit. She giggled, "That's never leaving my mind so you might as well moan like that from now on."

She dug deeper and quickly had her hips pressed into mine, and started fucking me vigorously. I almost got close to an orgasm, but she instantly came after her 5th pump and collapsed on top of me as she pulled her dick out, "Wow... that's harder than I thought it would be..."

She laid there panting. I heard stretching from her body once again, but couldn't really tell what had grown, as it was late, and sleepiness was overtaking the both of us. She laid on top of me, her body feeling heavier, and her breasts bigger as they pressed against me.

"Love you sweetheart..."