Charlotte and Julie talked a little while longer. It was getting late and I knew Julie was planning hikes in the early morning. Every now and then, the two would giggle like junior high school girls. I went into the cabin's tiny living room and finished my drink. There was no TV so I sat down on the couch and just thought about how I was going to get Julie out the door.

I thought I might be able to send Julie to the general store for supplies. Mark would be a problem too but I still didn't regard him as much of a threat. Charlotte would drop him for a real man with experience in a minute. He could be moved to the side, sent to his room. I finished my drink in a swallow, closed my eyes, and imagined the feel of my lips on Charlotte's generous bosom, my hands caressing her curvy ass.

I heard chairs move across linoleum. I opened my eyes. "Good night, Julie," said Charlotte as she was crossing the living room behind the couch.

"Good night, Char." Julie was coming into the living room and took a seat next to me.

"Good night, Charlotte," I added. My eyes were on Charlotte's sexy departing view, swaying ass checks wrapped tight in denim.

Julie gave me a playful punch. "Hey, I'm here."

"I can look, can't I?"

"See that's all you do," Julie said. She was smiling at me. My God, she was clueless.

"What were you two talking about in there?"

"Mostly about Mark," she said. "I want her to get serious and find a man her age."

"She likes little boys," I said.

"No, she likes men, I've known her a long time." And, from what she says, Mark is no little boy."

"She's used to small guys," I said. "As soon as a kid with an average dick shows up, she gets all excited."

Doug," said Julie. "Stop that kind of talk." Her voice dropped to a whisper. "I think they can hear us."

"I don't think so," I said.

"Yeah, I can hear them," said Julie. "Listen."

I did. I could hear low talking, a giggle. I couldn't make out any words until I heard her say, "Please".

"I have to study," was Mark's barely audible reply. Apparently, he was not quite the insatiable stud Charlotte claimed he was.

There was some more talking. Julie and I looked at each other. In a minute, we heard the sound of a bed swaying, the unmistakable rhythm of slow fucking. "I guess Char won that argument, good for her."

"She should be arrested," I said to Julie. I was full of indignation though in hindsight, I don't know why. Only a year ago, I had taken the virginity of a daughter of one of my employees. She was sixteen at the time. It was some of the best sex ever too, her squealing that my cock was too big, my plunging it forward anyway, making sure that the next man that got in there would find a lot of empty space.

Julie brought me back to the moment. "I don't think she's hurting anyone," she said, her forehead creased in pain. "Oh Doug, I'm so confused."

"Maybe she's just having a fantasy," I said to Julie. "Maybe she's making this whole thing up."

"Oh Doug, you don't really believe it."

I shrugged. "We didn't see anything."

"You can hear them," Julie said, pointing to the door, the source of the sound of the bed creaking.

"Yeah, I can hear that. But maybe they're...I don't know, dancing."

Julie shook her head. "You're crazy."

My eye was on the door. It wasn't latched properly. It was open a hair's width. I could crack it open slowly and we can see what they were doing. I suggested it to Julie.

"No, we shouldn't." Julie seemed a little unsure. "We really shouldn't."

I was already off the couch and tip-toeing for the door. The noise of the bed grew louder. I knelt down and pushed the door open slowly. The angle on the bed was perfect. I could already see someone's bare feet handing off the bed. I paused as I noticed Julie knelt beside me. I opened the door a little bit more.

What I saw confused me for a second. Charlotte was on all fours, facing away from us. An extremely muscular backside was right behind her, his thick ass punching into Charlotte, making her gasp with every thrust. He was too far away from her ass to be really penetrating her though unless he was just pushing with the tip of his cock. It was strange but maybe Charlotte didn't want this Mark kid inside her.

"Charlotte didn't win the argument entirely," said Julie into my ear.

Mark was still studying. He had a book opened over Charlotte's ass. He had a notebook open onto the book and he was writing into it with a pencil. I'd never seen anything like that before. The kid was fucking a beautiful girl while he was doing his homework.

"God, that's so good Baby," said Charlotte, in between gasps. "You're doing me good."

Mark grunted "uh uh" but kept his rhythm. "One more calculus problem," he told her. "I promise."

"It's OK baby," said Charlotte, moaning through the words. "I can wait all night."

Julie and I looked at each other. Her look was one of shock. I don't know what I looked like to her but I tried to hide my envy. Even when I was his age, I never got to fuck a piece of ass as good as Charlotte. And I never fucked anyone while doing math problems. I was reminded though that he was probably not really fucking her, that the head of his dick was only touching the outside of Charlotte's pussy. But I only had to wait a little longer to find out what would happen when Mark finished his homework.
"Done," he said, closing the book on Charlotte's ass and then laying it beside him on the bed. "Hang on Baby."

Mark pressed on her back and she fell to her stomach. He then came down on top of her. He started pushing faster now. Mark's head was down by the back of Charlotte's neck and he was nibbling. "That's so sweet, Baby." I could see all the thick muscles in Mark's arm support him easily as he did pushups over her body, his body coming down low to say something low in her ear that made her giggle. Then his body would come back up and that gave him more room for his hips to thrust forward.

His tempo was picking up. Charlotte's head was moving toward the headboard at the end of every long stroke. "Uggg Ugg," Charlotte seemed to be saying. She reached behind her hand back and started slapping his hip. "Too deep, too deep, too much Baby."

"OK, Sweetie," said Mark. He pulled his body off her and started to turn.