None of the characters in this story are underage.
While I was away for my freshman year of college, my parents bought an RV. Mom always wanted to travel, but Dad was always too busy working. I don't know why they thought buying an RV would change any of that. Other than a couple of weekend test outings at nearby campsites, Dad still never took the time. So, it was decided that when I came back for summer break, Mom and I would hit the road.
We plotted a course through all the National Parks out west, connecting the dots with some scenic drives.
The RV was a small thing, used, but in good condition. It had a queen size bed and a little sofa bench, a kitchenette, and a bathroom with a narrow shower.
The first night, we got as far as a state park in Kansas with no hook-ups. It was on a dirt road, and we had the place to ourselves, so it was a great start. Starry night, black sky, warm air, we sat outside, drank a couple of beers and talked until after midnight. We made it a rule that we would not talk about anything going on at home or school for the whole trip. She started reminiscing about her younger years, stories I'd never heard before. I looked over at her and saw by lantern light that pretty girl who grew up outdoors and used to go parking by the creek with her high school sweetheart. She was wistful, and I was enjoying the intimacy of this side of her I had never seen.
We went inside and took turns in the tiny bathroom to change clothes and use the toilet. I felt conspicuous making any bathroom noises, since the walls were so paper thin, even after I flipped on the fan. This was going to be a long trip if I was too self-conscious to take a good dump.
After we both got dressed, me in a t-shirt and gym shorts and her in flannel PJ's, I suggested another rule: "How about whenever one of us in in the bathroom, the other one puts in their earbuds?"
She laughed, but she liked the idea, probably with the same concerns I had.
Then she climbed into the bed, and I laid down on the sofa bench.
I couldn't get comfortable and kept rolling around and grumbling.
"What's wrong?"
"There's a bar across the seat right in the middle of my back. I need to figure out how to..."
She cut me off, "That's ridiculous. This bed is plenty big. Get over here."
It was no big deal, so that's what I did.
Sometime in the night, I felt her moving around and I slit my eyes open. The moon had come up, so I could see quite well. She got too hot in the PJ's so she slipped out of the bottoms, and slid on top of the covers in just her panties. And she unbuttoned the top but kept it on. She never wore a bra to bed.
I just looked at her in the moonlight for a while, pale legs, her cleavage, the silhouette of her face. This must have been what she looked like in the back seat of that car with her boyfriend. She was so pretty I wanted to reach out and touch her, but I didn't want to break the spell.
The next morning, she got up before I did, and laughingly threw my earbuds at me as she made her way into the bathroom.