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 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 ask.

“Yes, really, Jim.”

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

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

“What if we weren’t related?” I ask.

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

I think, “That’s promising.”

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

“A week from Friday,” she replies.

“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 whines.

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

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

I go to my room to plan how to do it. I start my computer and open a text editor to enter the steps I need to take.

I decide 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 can 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 I hope she brags about it to her friends. That should get their juices running.

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

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

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

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

Jill seems mesmerized, as she hasn’t moved or looked elsewhere. When she finally realizes the situation, she has been staring at my cock for several minutes before reaching for the doorknob and closing the door.

I think, “That went better than expected.”

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

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

They all want 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 tells Jill to call her after school.

Later that afternoon, Jill calls Marcie.

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

“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 says 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!” exclaims Jill.

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

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

“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 looks at the ground and mumbles, “Yes Dad.”

“I didn’t hear you, Jill.”

She looks up and repeats, “Yes Dad.”

“That’s better. Is your homework done?”

“Oh shoot! I forgot about it!”

“Get upstairs and get it done!” Dad insists.

Jill runs to her room and slammed the door.

“Kids!” Jim exclaims.

“You were just like her a few years ago,” his Dad reminds him.

“I know, Dad. It’s amazing how a few years maturity changes your outlook. You’ll have to excuse me, I have an exam to study for.”

“Go ahead, Jim. I’m glad to see you being serious about your education.”

Thursday, the girls meet in the school cafeteria for lunch.

“Marcie, are you serious about spiking the punch?” asks Beth.

“Yes Beth, we’re serious. How else will we get to see Jim’s cock?” Marcie replies.

“We’ll just have to make sure we don’t drink too much punch,” states Sandy.

“Beth; Sandy; relax. Jim doesn’t drink at all so he should loosen up pretty quickly,” said Jill.

“I’ll bring a half-pint of vodka with me,” Marcie informs them.

The bell rings, ending their lunch period. As they leave the cafeteria, Jill says, “Plan on being at my house at 4:30 pm tomorrow.”

The other three girls say, “Okay,” and proceed to their afternoon classes.

I have no classes on Friday, so I was home when our parents leave for Aunt June’s. Later, I go shopping for supplies for the sleep-over as my parents asked me to. Besides potato chips and pretzels, I buy two three-liter bottles of fruit punch. When I get home, I pour a half-pint out of each bottle and replace it with vodka that a friend of mine at the college got for me.

When Jill came home from school, she asked me if they can use our parent’s punch bowl instead of pouring the fruit punch from bottles.

“I don’t see why not,” I reply, “it will make it seem like more of a party.”

Jill says, “Thank you Jim,” and kisses my cheek.

At 4:30 pm, Marcie arrives, followed by the other girls. I pour both bottles of fruit punch into the punch bowl, then go take a piss. While I’m gone, Marcie adds another half-pint of vodka to the punch bowl.

When I get back downstairs, I half-filled an eight-ounce cup with the punch. The vodka that I added isn’t noticeable. I grab a couple of other bowls, fill them with potato chips and pretzels, and take them into the den, where the girls talk and dance. The salty chips and pretzels encourage the girls to drink more punch.

A few hours later, the girls are starting to feel the effects of the punch, as am I. The girls are starting to slur their words and are a little unsteady on their feet, I feel my inhibitions dropping away as I go into the den to check on the girls.

Marcie wraps her arms around my neck and says, “Hey Jim, I hear you have a big cock.”

“I do,” I reply, “The guys on the high school swim team called me ‘King Dong’.”

“Can we see it?” she asks.

“What are you going to do with it if I take it out?”

“Wouldn’t you like to know!”

As I unbuckle my belt, Marcie yells, “He’s gonna take his cock out!”

The girls gather around me as I unbutton my shorts and lower the zipper. I drop my shorts, revealing my nine-inch, thick cock.

“My God, Jill wasn’t joking about the size of his cock,” says Beth, amazed.

“I’ve got to feel that man-meat inside me,” moans Stacy.

I lay down on the floor and ask, “Who wants to ride my monster cock?”

Stacy strips, then straddles my hips and lowers herself onto my cock. When she’s taken as much as she can, there are still three inches outside her pussy. She starts riding me, up and down, and orgasms quickly.

“WOW!” Stacy exclaims, “I was cumming almost from the moment he was in me!”

While Stacy rides me, the rest of the girls strip.

As soon as she is naked, Marcie says, “I don’t know if I can get that thing in me but I’m sure gonna try.”

She takes the same position as Stacy and slowly sinks on my cock. Amazingly, her pubes meet mine. As she moves up and down my cock, the head hits her cervix on every down movement.

“I love your cock, Jim!” she yells.

A few minutes later, her pussy convulses around my cock as she cums, then as her orgasm fades, she unmounts me.

Beth then asks me, “Are you any good at eating pussy?”

“Sit on my face and find out,” I reply.

She does, and I lick through the folds of her pussy before spreading her lips, curling my tongue, and thrusting it into her hole. I wet a finger and used it to circle her clit. As I wiggle my tongue in her hole, I press on her clit, and she explodes, her juices flowing into my mouth.

“Enough!” she yells, so I release the pressure on her clit and remove my tongue from her pussy.

“How was that?” I ask Beth.

“Too much, too quickly,” she replies.

“Jill, what about you? What do you want?” I ask.

“Jim, I want your cum and I want it deep in my pussy. I finished my period two weeks ago, so I’m fertile. I’ve always dreamed of you putting a baby in my belly.”

The other three girls gasp, hearing Jill say that.