Authors notes: a) This is more of a "straight to the point" type of story, with less character development and more naughty action, so if you're more into longer stories, consider moving on. b) There is a bit of piss play (just a small section), so if that's not your thing, skip.
Everyone else, enjoy
PS: A big thank you to Thewizard Whitebeard for the story edits.
...
"Are you sure we should do this?" asked Marvin as she blatantly saw his 19 year old baby sister slowly approach him on bed, slowly unbuttoning her shirt, walking towards him.
"Oh Marvin, you are the one who wanted this, remember? I am not the one who kept secretly staring at their little sister's big breasts. Besides, I know you get the hardest watching me in this school girl's outfit."
Tabitha reached Mark, now in her white bra. Her shirt slid off her shoulders, her lush breasts barely staying inside. She took Marvin's hands and tied them with her ponytail ribbon on the bed frame. Her long black hair was open and flowing. "You know, a girl can only ignore so much before her own needs take over," she purred.
Ripping his shirt off, she unbuckled his pants but reconsidered, and stopped. "Mmmm. That would be too easy." Saying this, she straddled Marvin, feeling him squirm below her. "I, myself, was shocked at first, you know? I mean, my own brother checking me out? That's gross and perverted. I was so mad. But I always held back knowing that you must have done it by mistake. But thrice? Four times? Five fucking times? That was when I understood and saw things in a different light." Tabitha slipped his pants to his ankles. She saw him getting hard, the outline of his cock suggesting that it's at least five inches long, though thicker than she imagined. She straddled him again. "I was used to being checked out, especially my boobs. But by my own brother? Damn. Made me realize how hot I must be! After that I enjoyed you eyeing me Marvin, but today was the limit when during that drive back home I had my girlfriends all in the car and I had to sit on your lap. You 'mistakenly' roaming your hands on me? Yeah. You know you cannot do that unless I say so. I love to stay in control after all. I do things first. Me! You will be punished for it today." Marvin now was pleading for her not to do this, but Tabitha wasn't having it.
She slid down and lay on her stomach, holding the waistband of Marvin's underwear, slowly sliding it below to reveal his semi-hard member. "See? You do like what is happening even if your mind denies it." She wrapped her palm around his cock "Mmmm... Are you getting hard for me?" She then starts stroking it slowly. "So, here's your punishment number one. I will purposefully try making you cum, with my mouth that is, but you are not allowed to cum unless I allow you, you clear?" said Tabitha seductively, rubbing his length on her face. "You pass your test successfully and I will show you one of my special assets," she winked. Marvin just groaned and grunted in approval. She started trailing kisses on his member before spitting on it and lubing it up, making it sloppy. "Oh, you like nasty, don't you? I've heard plenty from your girlfriends." Saying this, she took the head in her mouth, moaning on his member. "Ummmmhhhh..." She sucked plenty, but only his tip, torturing it.
"Let's take it up a notch." She fully engulfed his cock, taking it down her throat, lathering it with her spit, gagging. "Guack, guack, guack, guack. Mmmmhh. Yes. You Like that?" Luckily, Marvin was more in protest than in pleasure so he didn't cum yet. Tabitha continued until drool was flowing from the sides of her mouth, latching on to his member. She stroked him with her hand before finally sitting up on his lower thighs not wanting to disturb his lathered, shiny member which was fully erect. "Ten minutes and no cum? That's a good enough time. You've been a good boy. I will give you your first treat now."
Tabitha got up and, holding her skirt up, bent over facing away from him. She slowly tucked her fingers inside the waistband of her white flowered panties, pulling them down, all the while looking in his eyes. Marvin couldn't decide where to look. One part told him to hold eye contact. His animalistic desires and his penis seemed to prefer his little sister's bare snatch.
His shock was evident when he saw her gash, her pussy lips protruding outwards, her juices dripping between her legs. "Like what you see, big brother? I bet you do," she said as she slowly walked back towards his face and finally straddled it, a moan escaping her lips. "Oh fuck." Marvin inhaled his sister's sex, as she barely spoke. "Your next task is... fuck..." Marvin gave into his desires: morals and consequences be damned. He started lapping Tabitha's snatch hard, licking her clitoris and pushing his tongue inside her hole with a swirling motion.
She started stroking him with her hands before finally 69ing him and pulling his cock in her mouth for another sloppy blowjob. Her breasts crushed on Marvins stomach. "Yes big brother! Take my cunt. Eat me hard... Mmmhhh."
Although she loved control, she decided to let go and let her desires take control. However, Marvin would still have to stay tied as she continued to have her way with him. Marvin continued lapping up her juices, swirling his tongue inside her cunt, slowly building up to her first orgasm.
"Yes big brother, yes. yes. yes... make me cum." After another seven minutes of eating cock while somehow holding his own cum, the big splash came for Tabitha.
"Fuuuuuuckkk... Yesssss... I am cumming..." Tabitha shivered as she came. Her juices dripped on Marvin's face, squirting a small amount before tiring out. She got off Marvin to lie on the side of the bed on her stomach.
She murmured, "Mmmm. Big brother, you do deserve a reward for still not cumming even through all this." She got up, faced Marvin, and unclasped her skirt, letting it fall. She then straddled him, slowly grinding her bare pussy on his cock, forward, and backward. "You wanted to see those breasts, didn't you?" Marvin finally managed to speak. "Yes, Tabby, please?"
"Okay, here's a peek," Tabitha said as she slowly lowered her bra from her left breast, allowing Marvin to have a good look, and then she covered it back up.
"Your large brown nipples are tantalizing, Tabby, and fuck... your boobs are huge!"
"Yeah, you want to see me jiggle them? Successfully complete your next task and I will show them to you however you like."
"Fuck. Okay, I will do anything."
"Good then. Be ready," she said sultrily.
Tabitha got up, Marvin's cock ached at the feeling of emptiness. She put on her skirt again.
"What is the task?" he asked.
"Well..." Tabitha blushed, knowing full well her fantasy was about to become true. "I have always been jealous of boys for one thing."
"What is it?"
"It's just, it's so unfair that you get to pee standing, anytime, anywhere, without a care for dribbles and stuff, whereas us ladies have to do it sitting because otherwise it runs down our legs, and causes a big mess. So... cutting to the chase, I want to try piss standing right now and this means that you will have to receive it on your face while I piss on you, and then clean my pussy with your mouth afterwards."
"Fuck, that's the most nastiest thing I have heard, replied Marvin. "So I do this and only get to see your boobs? What the hell!?"
"No dear. You let me do this and I will happily give you more than just my breasts," purred Tabitha.
"Fuck. Okay. Do it," Marvin agreed, opening his mouth.
