We had the laziest lifeguards in the county. IF they were even there, all they did was show off for the girls, read, or listen to their radios. Most of them had their phones with them, and spent the time texting someone.

My sister and I loved to go, but most of the time it was so full that we couldn’t have any fun. That’s why our brother, Craig, stopped going a couple of years before.

“I’ll tell you what,” Becky said. “I’m beginning to agree with Craig. I’m not sure I even want to keep coming here.”

“We have to, sis,” I said. “Mom bought us all a season pass. Those things aren’t cheap.”

Becky and I are twins, and had just turned fifteen the week before. School had let out the day before our birthday, and this was our first outing for the summer.

“Look, Donny, you can do whatever you want to. I’m tired of being groped out there.”

“It doesn’t bother me when I am ... but that doesn’t solve anything.”

“I swear,” she said. “Someone could have sex out there, and no one would know it happened.”

“I think someone would see you.”

“What do you want to bet?” she asked me.

“I don’t know how you’re going to prove it.”

“We are. We’re not actually going to have sex. We’ll just act as if we are. Let’s see how many of those “text” guards notice us.”

“You want me to go out there with you, and act as if we’re having sex?”

“Yeah. What’s the matter. Am I too ugly for you?” She stood with her fists on her hips.

I know that some of you guys have sisters out there. Some are ugly and some, like my sister, are jack-off material. Becky has long brown hair that comes to her ass. She wears it in a cap at the pool. Her tits aren’t very big ... yet, and her ass is forming out nicely. She still has some baby fat around the middle, but not much.

She finally talked Mom into buying her a bikini, and she wore it that day. What Mom never saw though, was how small it really was. The top didn’t even come under her tits. It was almost like two little patches over her nipples. The bottom was basically just a small triangle that covered her mound ... almost.

“You are far from ugly, sis. You really want to try this?”

“Yes. You’ll put your hand real low on my stomach. With that many people in the water it will look like your hand is down my front. Your other hand will be higher up. I’ll be in front of you with my back pushed into you. After a while, you can start acting like you’re ... uh ... humping me.”

“That would be a dream I would gladly carry out.”

We got into the water and found a corner near a lifeguard. We watched him and everybody else for a few minutes.

“Ok. Let me have your hands.”

I wrapped my hands around her, and she moved them where she wanted them. One was actually pushed up between her tits. The other one was on the fabric of her bottoms.

“I thought this was supposed to be simulated, sis.”

“It has to look realistic. Start moving yourself.”

I wear the boxer style swim pants ... with one exception. I cut the mesh lining out. Every time I move in them it sort of gets tangled up. I figured that they were long enough, so I cut it out.

I was hard just being there with Becky, and what she was wearing. Now she had her ass pushed into it. I was literally riding in the crack of her ass. We were at it for a few minutes when I realized that one of the legs of my pants was riding up.

“Uh, sis? I have to pull the leg of my pants down. If I don’t, you’re going to get a surprise.”

“We can’t stop now. Let it ride up.”

I kept up what I was doing and, sure enough, my dick came out right into her ass crack.

“Is that what I think it is?” she asked. She didn’t have to whisper because of the noise.

“I told you.”

“Is that going to make you cum?”

“Even doing it with the fabric there would do that.”

“Go ahead. Are you close?”

“I will be in a minute.”

“Then tell me what I can do to help.”

“Can you open your legs a little?” She did.

“Is that better?”

“Yeah. That’s a whole lot better.”

“I know what else will work.”

She took my hand and put it under the fabric of her pants/thong. She slid it down as far as I could reach, and pulled her hand away.

“Is that better?”

“Much.”

She took that same hand and reached between her legs. She brought my dick up, then bent over a little bit. She pressed my dick against her pussy.

“What are you doing?”

“I’m proving a point ... and making it better for us.”

The back of her pants was only a string. With one finger, she moved that out of the way. I now had no obstruction at all. My finger slipped between her lips and found her clit. She gasped.

“Move your hand up and down there.”

Her hips were now working with mine. I was just about to decorate the outside of her pussy when she jerked and I popped in. She straightened up and pushed against me.

“I didn’t mean to...”

“I guess we’re not simulating anymore. Are you still close?” she asked.

“Yeah.”

She bent forward again and pushed back. She slid on me a few more times and I couldn’t hold it. I pulled her back with one hand and slid the other one down to assist. I emptied myself into her.

She put her hand on mine and had me continue stroking her clit. It seemed like about five minutes later that she jerked forward and her face went under water. I filled her again before she surfaced. She straightened again, and pushed back against me.

“That was ... incredible,” she said. “I wouldn’t mind doing that again.”

“Uh, sis?” I said. “I came inside of you ... twice.”