Everyone in this story is 18 years old or older.
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Karl and Kim were 18 year old twins in their senior year of high school. They were fraternal twins and if you didn't know them you wouldn't think they were even related.
Karl was very handsome with chiseled facial features. He had mesmerizing deep blue eyes and a head of thick curly blond hair. His very athletic build accentuated his swimmers body. His second best feature was his bulbous butt. It was hypnotic to watch him walk down the halls at school. His best feature, of course, was what lay between his thighs. He was well equipped with a 7.5 cut penis with the girth of a coke can and nice low hanging smooth balls.
Kim, on the other hand, was less fortunate in the looks department. She was a very plain girl with thin stringy hair and no boobs or ass to speak of. Her fashion choices didn't help. She chose baggy clothing to help conceal her non existing body parts.
Kim had always been jealous of Karl. His natural beauty. His seemingly effortless ability to make friends with everyone and the ease at which he excelled at anything he tried. Everything good just seemed to fall into his lap. This jealousy carved a wall between them.
Karl never really understood why there was this barrier between them but knew something wasn't right.
During their senior year Karl was nominated for most every superlative. He was voted most handsome senior and most likely to succeed. He got homecoming king for both football and basketball. Just name an award and if he didn't win it he had been nominated for it anyway. He ruled the school. Everyone thought the world of him.
Well except his twin sister Kim. All this infuriated her to no end. She couldn't stand it that he had all this popularly and she had none. She wanted to knock him off his pedestal so badly.
Kim got her opportunity one early morning.
Kim and Karl's bedrooms were upstairs and their parents was downstairs. One morning Kim woke up early, very early, about 3;30 am needing to pee. She tiptoed to the jack & jill bathroom separating her and Karl's bedrooms.
As she quietly relieved herself she heard noises coming from Karl's bedroom. After finishing her bodily function she leaned against Karl's door to listen more closely. She heard moaning and grunting sounds. At first she was thinking Karl was writhing in pain.
Without thinking she opened his door but stopped before she entered. What she saw blew her mind.
Her brother was in bed on his back with his legs high in the air. The closer she looked she saw the reason for the moans and groans. Her twin brother was furiously fucking his ass with a huge dildo. He was shoving it in and out with one hand and pounding his hard penis with the other.
She quickly returned to her room and grabbed her phone, setting it to video record. As she was filming him he started saying, "Oh that's it Tom fuck me hard baby! Fuck me like you always do! Tear my ass up baby! Come on, fill my hole with your hot cum!"
Just as Karl ejaculated all over himself and withdrew the dildo with a plopping sound she gently closed the door and slipped back to her room. She replayed the video several times just to reassure herself that what she'd seen was real.
Kim could not believe what she had witnessed. She had her revenge on her phone.
Kim didn't sleep much the next few nights pondering the possibilities ahead of her.
She never mentioned anything until one Friday afternoon after school. She was at the kitchen table when Karl breezed in to grab something to eat. Their parents were still at work so they were alone in the house.
Kim asked Karl, "So what are your plans for the weekend?"
Karl looked shocked. Kim had never been interested in his plans at anytime before now.
"Wow, since when have you been interested in what I was doing, ever?" Karl asked.
Kim snickering answered, "Oh I don't know, just curious I guess."
"You're acting weird, I mean even weird for you," Karl laughed. "And that's pretty weird,"
"Ok cutie pie, laugh while you can." Kim announced.
"What the fuck is that supposed to mean?" Karl asked.
Laughing out loud Kim said, "You like that word 'Fuck' don't you?"
Karl shaking his head, not getting what Kim was talking about just looked at her and started walking away.
"Tom likes to fuck too, doesn't he?" Kim asked bluntly.
Karl froze in place. He couldn't quite put together how she might know anything about him and Tom. They had been so very careful about their relationship. If it got out that they were gay. They would both be ruined.
Karl finally responded with, "Tom who and how would I know about stuff like that?"
Kim didn't answer but clicked on the video on her phone playing only the part where Karl's moaning about Tom fucking him.
"Wha.......wher..........how........that's got nothing to do with me!" Karl screamed.
"Oh but it does my little homo brother," Kim said.
"That's not my voice, it just sounds like me," Karl argued.
"Well if it doesn't 'sound' like you it sure as hell looks like you," Kim replied.
"What do you mean looks like me?" Karl tentatively asked.
"Yep there's a video to go along with the audio, gay boy," Kim laughed.
She then held up her phone and played the video for her brother. Karl's eyes bugged out as he watched himself. With one hand he was rapidly fucking his own ass with the dildo and viciously masturbating his rock hard penis with the other.
Karl was totally humiliated. His twin sister had a video of him naked and fucking himself. He couldn't believe this was happening. Then he heard himself again calling out for Tom to fuck him hard just before he shot loads of creamy white cum all over himself.