Sister’s sleepover led to us fucking

My name is Jim. I’m twenty years old and still live at home while attending a local college. I have a good physique, having been on my high school swim team, and I continue to work out. The other guys on the swim team used to call me ‘King Dong’ due to my nine-inch-long, thick cock, which they saw in the showers after practices and swim meets.

I’ve been attracted to girls at least five years younger than me for as long as I can remember, so none of the college girls interest me sexually. My sister, Jill, is a fourteen-year-old knock-out with a grown woman’s body. I’ve been lusting for her ever since she started developing tits. It isn’t unusual for our parents to go somewhere overnight and leave me in charge when my sister is hosting a sleep-over.

One afternoon, while our parents were still at work, Jill was planning a sleep-over. We were sitting in the den when she mentioned that some of her girlfriends think I’m hot, especially Marcie and Sandy.

“Really?” I asked.

“Yes, really, Jim.”

“What about you, Jill. Do you think I’m hot too?”

“Jim, you’re my brother,” she replied.

“What if we weren’t related?” I asked.

“If we weren’t related, I’d be interested.”

I thought, “That’s promising.”

“So, when are you planning this sleep-over for?” I asked.

“A week from Friday,” was her reply.

“Okay, I won’t make any plans for Friday night or Saturday. You know Mom and Dad will disappear for your sleep-over.”

“I know, but I wish they’d treat me more like an adult instead of having you stay with us,” Jill whined.

“Jill, they do it to protect you girls from teenage guys crashing your sleep-overs and taking advantage of you,” I said adamantly.

“Maybe I can take advantage of them,” I thought.

I went to my room to plan how to do it. I started my computer and opened a text editor to enter the steps I needed to take.

I decided that the first step was to appear careless while taking a shower. My last class ends at 2 pm, and Jill gets home at 3 pm. I could take a shower with nobody home and forget to close the door. When Jill gets home, she has to pass the bathroom to go to her room. That gives her the ‘opportunity’ to see ‘King Dong’ through the clear glass shower enclosure and hope she brags about it to her friends. That should get their juices running.

The next steps would take place the night of the sleep-over. First, I’d spike the fruit punch they liked to drink when they got together with some vodka to loosen them up a bit. Then I’d make sure they could see the bulge in my shorts. After that, I’d have to play it by ear.

I put my plan into action on the Tuesday before the sleep-over. At 2:50 pm, I got in the shower after leaving the bathroom door open and slowly stroked my cock. At promptly 3 pm, I heard the front door close and footsteps coming upstairs.

As Jill passed the bathroom, she yelled, “OH MY GOD! Why didn’t you close the door?”

“I was home alone and I guess I forgot,” I answered, still stroking my cock.

Jill seemed mesmerized, as she hadn’t moved or looked elsewhere. When she finally realized that she had been staring at my cock for several minutes, she reached for the doorknob and closed the door without saying anything further.

I thought, “That went better than expected.”

At school the following day, Jill ate lunch with her girlfriends.

They were chatting about several guys during the conversation when Jill gushed, “The most amazing thing happened yesterday!”

They all wanted to know the details.

“When I got home, Jim was in the shower and he forgot to close the bathroom door. Our shower enclosure is clear glass, so I got to see everything! He was standing there stroking his cock. It was huge! It must have been 12-inches long and it was real thick!”

“Stop exaggerating, Jill,” said Marcie.

“I’m not, Marcie. Jim has a huge cock!” she retorted.

“I’ve never even heard of a cock that big, much less seen one,” mumbled Sandy.

Marcie mused aloud, “Maybe we can get him to show it to us at the sleep-over.”

Just then, the bell rang, ending their lunch period. As they left the cafeteria, Marcie told Jill to call her after school.

Later that afternoon, Jill called Marcie.

“Hey girlfriend, what’s up?” Jill asked.

“Jill, if he’s got a cock as big as you say it is we’ve got to figure a way to get him to show it to us,” Marcie said excitedly.

“Marcie, I didn’t lie, it’s huge!”

“Do you have any ideas on how to get him to show it to us?”

“No Marcie, I don’t. You know he tries to stay out of our way when I have a sleep-over.”

“I’ve noticed that he likes to drink the same punch we do. Couldn’t we spike it a little to loosen him up?” Marcie suggests.

“That might work!” exclaimed Jill.

That evening, their Dad asked Jill, “Who will be here for the sleep-over?”

“Just the usual group, Dad,” she replied.

“No Jill, I want a list of names.”

“It’ll be Marcie, Sandy, and Beth, Dad.”

“Okay Jill, that’s fine. Remember, no alcohol and no boys. Mom and I are going to visit Aunt June for the weekend. Jim will be here to make sure nothing goes wrong.”

“Dad, I’m fourteen, not eight. I don’t need a babysitter!”

“Young lady, as long as you’re living in my house, you’ll live by my rules!”

Jill looked at the ground and mumbled, “Yes Dad.”

“I didn’t hear you, Jill.”

She looked up and repeated, “Yes Dad.”

“That’s better.