Fuck caution, you know perfectly well who you want to claim

You grin mischieviously, looking at your older sister up and down. Caitlin is as stunning as ever. Her long, silky black hair cut to the waist down. Her piercing blue eyes. Her high cheekbones, full lips and beautiful face. Her perfect hourglass figure, with massive tits, wide hips, bubbly ass, thin waist, long legs and athletic shapes thanks to a mix of working out and good genetics, all barely covered by the thin fabric of a white tank top showing off lots of cleavage and a red tiny skirt with black stripes. If she's not the most gorgeous girl you know, it's from a short stretch. But it doesn't matter, because in your eyes she's the most desirable woman on Earth. Not only because of her amazing body, she also has a bright mind, a witful humor paired with a caring yet facetious personality. But more importantly, your bloodties are a turn on more than a turn off for you. You've spent years fantasizing about her and all the taboos you would break with her given the opportunity. Several time you tried to **** yourself to crush on other girls, only for your big sister to creep back into your mind during your wanking sessions and wet dreams, until you completely embraced your lust for her.

"Don't worry." you answer, "I've known for years which woman I wanted to be my first bitch. And luckily, she's in front of me right now."

"Eh...?" Caitlin at you with a blank face, then around her. She quickly realise the few passerbies whose attention had been caught by your fainting are long gone and she's standing alone in front of you. "Wait, what..."

"Caitlin, I claim you." you calmly state.

For a brief instant, she stands still, her eyes widening in shock. But soon, she regains her composure and joy invade her face. "Oh, master, I'm so happy!" she exclaims with a smile matching her words. "I will be the best **** you could wish for!"

You grab her ass and draw her into your embrace. Her boobs are crushed against your torso and she probably can feel your erection through the fabric of your clothes. You forcefully kiss her, but she instantly reacts by wrapping her arms around your neck and playing with your tongue and lips with ardor. She's probably the best kisser you've met so far, but maybe your claim on her increases her wish to please you. "It doesn't bother you that I'm your little brother?" you ask with a grin.

"No, master!" she assures you. "Actually, it excites me even more. I would probably be terribly ashamed if you rejected me because of this, but I don't think it's your intention."

"Clever girl." you answer, fondling her buttocks. "Now drop the panties and offer me your pussy."

She winks at you and evades your embrace so she could turn around. She then slips her hands beneath her skirt and seizes the strings of her thong and slowly slides it along her thighs, then her sexy legs without bending the knees. She finally keeps it crumpled around one ankle and lift her skirt to her waist to reveal her round butt and wet demanding pussy. Finally, she presses her palms against the nearby bus stop and wait for you to take her. "Do you like what you see, master?"

You hastily untie your belt to free your already hard cock and grab her hips. "No, I love it." you answer, plunging inside of her.

"Oh! Master!" she yelps as you start penetrating her with vigorous thrust in the middle of the street. "Do you also love the way it feels?"

"Hrnn... Yes!" you reply, using your powers to tighten her vagina even more while enlarging your dick at the same time. "Of course I love it!" You grab her tits and rip her top to knead them without being bothered by obstacles. "You're the best slut I could wish for! I want to fuck you everyday and night for the rest of my life!"

She starts panting, waving her hips and screaming louder and louder, ignoring the few people waiting for the bus glancing at you from time to time. They seem more bothered by the noise than by the display of lewd sex, but nobody wants to speak up. You playfully spank one of your big sister's asscheek and ask "Have you ever dreamt you could be fucked in public by your little brother?"

"Aaaaaah! Master, I... I never imagined you could be interested in me, but yes, I've always had exibitionist fantasies! I never dared to fullfil them in such a way however!"

You pull her hair and grin, thrusting more violently. "You mean you never paid attention to me, then, because I don't think I was so subtle you'd never noticed me staring at your tits and ass."

"I... I always thought it was in all innocence master. Boys like breasts whoever they are attached to, I guessed." She's probably honest, but it makes you feel like she was seeing you as a sexless creature until today and it fills you with rage. You fuck her pussy with a renewed passion, crushing her big chest against the glass of the bus stop. You suddenly catch a short redhaired girl filming you on her phone from the other side and give her a thumb up and a devious smile, which she returns you.

"Smile at the camera, you slut! Maybe you're about to become an internet porn star." you whisper into her hear.

"Ooooh! I would love that, master!" She turns to the redhead and give her her brightest smile while you keep pounding her deeper and deeper. It's amazing how fast her mind seems to have been rebooted so she now place your pleasure before anythign else. You also notice a few guys around are also glancing appreciatively at the two of you and nod at them. Let them enjoy the show as long as they don't try to take part in it, you think.

It doesn't take long for you to reach orgasm and empty your balls into your elder sister's unprotected womb, the both of you yelling in unison.

You feel amazing, it's the best sex you ever had especially on a first time. And judging by your ****'s euphoric smile, she didn't hate it either.