You know big bro is... sexually frustrated. Sure, he has a girlfriend, but she's a prude (and you know because you press your ear against the paper thin wall that separates your bedrooms whenever she's over, how they get hot and heavy and her whorish little moans stop to a protest when big bro tries going any further, how he sighs and gives up easily because he's a good boyfriend) and honestly? It feeds a little ugly part of your heart because how dare she deny your big brother, and you could do better than her, you know you'll do better.
So when you hear quiet whispers asking for water, you hurry out to the living room and turn the TV on, draping yourself across the sofa in a perfect image of a little brother who had fallen asleep in the middle of a movie. You hear the soft thumps of footsteps behind you, the creak of metal and rush of water. Your heart thumps in your ear when you feel a presence in the entrance, quietly stepping near and hovering over your curled up form.
Such a cute little thing you were, curls of hair framing your peaceful face, cotton shirt draped along curves and dips. His eyes trail lower, and his breath hitches. You had deliberately taken your pants off, the soft plumpness of your pussy barely covered by the shirt.
The sofa dips under a new weight, his hand gently caressing your head. The other tentatively rubs your thigh, careful, barely ghosting the skin as if he knew he was doing something wrong. Forbidden.
"Baby?" he whispers, pushing the hair off your forehead. He inches closer to your heat, thumb kneading the plump inner thigh. "You're awake, aren't you? No need to pretend. Naughty thing, teasing your big brother like this..."
You shudder, eyes cracked open a sliver, flustered at having been caught so easily. So instead you wiggle into his arms and open your legs, wispy curls damp from how wet you'd gotten. "Big bro..." you blink coyly, voice quieter than the low hum of the TV. "I wasn't doing anything..."
He laughs, a growl in the back of his throat as his fingers sink into your thigh. "Don't lie. Flaunting this sweet thing in front of me, did you think you could get away with it?"
You giggle, biting on your lower lip and waiting with bated breath as his hand cup your cunt, pinching your folds open and closed, letting a trickle of slick drip down. "I can treat you better than she does," you tease, hand wrapped around his wrist. Hips jerking slightly to rub against his warm hand, moaning everytime your clit is nudged.
"Mm, can you?" He murmurs, as affected as you are. The flickering blue light hits his face in the perfect angle, the dark room hazy and dream-like. You moan again, and the sound goes straight to his cock. His aching, dribbling cock straining his pants. Fuck, it's been way too long. He fumbles with his fly, pulling his shaft between the metal bite of the zipper, cock sprang out and slapping your slicked folds.
"Ah-♡" you moan again, giddy when you realize you're finally, finally about to get what you wanted. His cock grinds between your chubby lips, the spongy head catching against your squeezing hole. "P-Put it in, big bro, I'm so much tighter than your girlfriend anyw-aah- ooh..."
He sinks his length into you, inch by veiny inch tightly constricted by your gummy walls. It takes everything in you to not scream, because fuck he's so much bigger than you ever thought, and yet so perfectly snug inside as if you were made for each other. You whine and pant, and big bro grunts as his balls press against your ass, looking at you like prey devoured.
"Fuck, baby," he groans, hips moving back slightly, fucking you with shallow thrusts. "You're so little. So tight, fuck- tighter than any girl I've fucked."
You preen at that, at the thought that you're the best he's ever had. His cock bullies into you, hard and insistent and sending sparks that make your head feel warm and feet tingle. You don't notice how loud you're becoming, the wet squelches and soft smacks of balls on your skin and high-pitched sobs as he rams into you, over and over, lips leaving trails on heated skin and words whispered filthy in your ear.
It's too much, it's everything you ever wanted and everything at once that you cry when he throbs deep in you, warm liquid seeping into your core and settling deep inside, spreading all throughout your body. Big bro licks away the tears you hadn't realized you shed, peppering kisses on your face and soothing your trembling thighs.
He hoists you up in his arms, carry you back to bed. You cling tight to him, trying to make him stay. His girlfriend is right behind the other wall, wondering what's taking him so long. You don't feel any guilt. Why should you? He's your big brother. You should always, always come first.
"Are you going back to her?" you whisper quietly, hurt seeping in your tone. He hesitates a little.
"Just for tonight," he replies, a gentle kiss on your forehead to placate you. Before he leaves, you grab his wrist again.
"Break up with her, big bro?" you ask, eyes blinking so sweetly in the way you know he could never refuse, and he sighs and smiles.
"Whatever you want, sweetheart."
