I never thought my quiet, bookish little sister Bethany would be the center of attention at a house party, let alone the one getting soaked in a wet T-shirt contest. At nineteen, Bethany was the definition of shy. She kept her long chestnut hair in a loose braid, hid her curvy 5’4″ body under oversized hoodies and baggy jeans, and blushed at the mere mention of anything sexual. Our parents were away for the weekend, leaving me — her twenty-two-year-old brother Jake — in charge of the house. I invited a few friends over for what was supposed to be a chill night. It turned into something far more forbidden.
The party started tame. Music thumped from the living room speakers, red Solo cups littered the counters, and everyone was laughing and playing stupid drinking games. Bethany had promised to stay in her room with her headphones on, but after an hour of muffled bass shaking the walls, she emerged in an old white T-shirt and pink sleep shorts, looking adorably out of place.
“Jake, it’s too loud,” she whispered, tugging at the hem of her shirt. Her cheeks were already pink. A couple of my buddies noticed her immediately. “Who’s the cute shy girl?” one of them asked with a grin.
“That’s my sister,” I said quickly, feeling a strange protective — and possessive — surge. But the energy in the room shifted when someone suggested party games. Truth or Dare. Never Have I Ever. And then the one that changed everything: Wet T-Shirt Contest.
The guys cheered. A few girls laughed and joined in. Bethany tried to slip back upstairs, but my best friend Mark pulled her into the circle. “Come on, Bethany! One round. It’ll be fun.”
She looked at me with those wide doe eyes, silently begging for rescue. Instead, I shrugged, my cock already twitching at the thought. “It’s just a game, Beth. Live a little.”
The rules were simple: Girls lined up, got doused with water, and danced or posed while the crowd voted. Losers took shots. Winners got bragging rights. Bethany was mortified but stayed when the other girls encouraged her. They were all in tight tops already. Bethany’s plain white tee was loose and modest — until the first splash of ice-cold water hit her.
The fabric clung instantly to her full, perky C-cup breasts. Her dark nipples hardened visibly through the now-sheer material. Gasps and whistles erupted. Bethany froze, arms crossing over her chest, but the water kept coming. Another bucket poured over her head, soaking her completely. The T-shirt turned transparent, molding to every curve of her body. Her shorts darkened between her thighs, outlining the soft mound of her pussy.
“Oh god,” she whimpered, face burning crimson. But she didn’t run. The shyness mixed with something new — a nervous thrill that made her bite her lip.
The crowd chanted her name. “Bethany! Bethany! Pose for us!”
I couldn’t take my eyes off her. My shy sister, dripping wet, body on full display for everyone. My cock strained against my jeans as forbidden thoughts flooded my mind. What if she posed just for me? What if I saw her completely nude?
She tried a clumsy little spin, water flying from her soaked hair. Her tits bounced, nipples stiff and begging for attention. One of the girls laughed and said, “She’s got a great rack for a shy girl!” Bethany’s eyes met mine across the room, humiliated yet strangely heated.
The votes came in. Bethany won by a landslide — not because she danced the best, but because her innocent shock and dripping wet body were pure fire. As the “winner,” the group demanded a victory pose. “Nude pose! Nude pose!” someone yelled jokingly. The room erupted in laughter and encouragement.
Bethany shook her head furiously. “No way… I can’t…”
But the alcohol was flowing, and the peer pressure was strong. Mark handed her another drink. “Just for fun, Beth. It’s a party game.” She looked at me again. I nodded slowly, my voice low. “I’ll make sure no one takes pictures, sis. Trust me.”
Trembling, she nodded. The other girls cheered her on as they led her to the center of the living room. Someone dimmed the lights. Music pulsed slower, sexier. Bethany’s hands shook as she peeled the soaked white T-shirt over her head. Her bare breasts spilled free — round, pale, with puffy pink nipples that begged to be sucked. The crowd went wild.
Next came the shorts. She hesitated, then slid them down her smooth legs, revealing simple white cotton panties already darkened with arousal. “I… I don’t know about this,” she whispered, but her body betrayed her. Her thighs pressed together, and I could see a wet spot growing.
“Off with them!” the chant continued.
Bethany hooked her thumbs in the waistband and slowly lowered her panties. Her smooth, shaved pussy came into view — puffy outer lips glistening with her juices. She was soaking wet, not just from the water. My shy little sister was dripping for the attention.
Completely nude now, she stood there, arms at her sides, trying not to cover herself. “Pose, Bethany!” they shouted. She turned slowly, giving everyone a view of her perfect ass — round and firm. Then she bent slightly forward, hands on her knees, and looked back over her shoulder with that shy, wide-eyed expression that made my cock throb painfully.
I was rock hard. The sight of my innocent sister naked in front of everyone — and me — was pushing every taboo button I had.
The game continued, but the focus stayed on Bethany. More water was poured over her nude body, making her skin shine. She shivered, nipples diamond-hard. Someone suggested she pose on the couch. Bethany sat back, legs slightly parted, one hand shyly covering her pussy while the other arm pressed her tits together. The flash of her pink inner lips made several guys groan.
I couldn’t stay away any longer. I moved closer, kneeling in front of her while the others cheered. “You look so fucking beautiful, Beth,” I murmured, just for her ears. Her eyes widened, but she didn’t pull away when my hand brushed her thigh.
The party games got dirtier. “Make her squirt!” someone joked. Bethany gasped. “I… I’ve never…”
But her body was on fire. I could see her clit peeking out, swollen. With the crowd watching, I poured more cold water directly over her pussy. She yelped, legs spreading involuntarily. The water mixed with her cream, dripping down her ass.
“Touch yourself, shy girl,” a girl encouraged. Bethany’s hand trembled as she reached down, shy fingers circling her clit. Her breathing quickened. I watched, mesmerized, as my sister masturbated in front of everyone — slow, hesitant strokes that grew bolder.
Her moans were soft at first, then louder. “Jake… everyone’s watching…” she whimpered, but her hips bucked. I placed my hand over hers, guiding her fingers faster. The taboo touch made her cry out.
The room was captivated. Phones stayed away as promised, but eyes devoured her. Bethany’s shyness cracked. Her legs spread wider, pussy lips parting to show how wet she was. Her fingers plunged inside, making obscene wet sounds.
“I’m… I’m gonna…” Her eyes locked on mine. “Brother… help me…”
That word — “brother” — in her desperate voice broke me. I leaned in and sucked one of her nipples into my mouth while my fingers took over, pumping two thick digits deep into her tight cunt. Bethany arched, screaming as her first public orgasm hit. But it wasn’t just an orgasm.
She squirted.
A clear gush sprayed from her pussy, soaking my hand and the floor. Her body convulsed, tits jiggling, mouth open in shock and ecstasy. “Oh god! I’m squirting! Jake, I’m squirting so much!”
The crowd cheered wildly. My shy sister had become the star — a secret squirter exposed at a party game.
But the night was far from over. After the intense orgasm, the party thinned out as people paired off or passed out. Bethany, still naked and trembling, pulled me upstairs to her room. Her eyes were glassy with lust and embarrassment.
“I can’t believe I did that,” she whispered, closing the door. “In front of everyone… and you… my brother.”
I pulled her close, my hard cock pressing against her bare stomach. “You were incredible, Beth. So fucking sexy. I’ve wanted this for so long.”
She looked up at me, shy but no longer innocent. “Me too… I think. Touch me again, Jake. Make me squirt for you this time. Just us.”
We fell onto her bed. I kissed her deeply, our first sibling kiss turning hungry fast. My hands roamed her still-damp body, squeezing her tits, pinching her nipples. Bethany moaned into my mouth, her shyness melting as she ground her wet pussy against my thigh.
I moved down, spreading her legs wide. Her pussy was puffy and glistening, clit throbbing. I licked her slowly at first, savoring the sweet taste of my sister’s cunt. Bethany’s hands fisted the sheets. “Jake… that feels so wrong… but don’t stop…”
I sucked her clit, fingering her deep and curling against her G-spot. Her hips bucked wildly. Within minutes she was gushing again — a powerful squirt that hit my chin and soaked the bed. “Yes! Brother! I’m squirting for you!”
Her orgasm seemed endless. I drank every drop, then climbed up and positioned my throbbing cock at her entrance. “You sure, sis?”
Bethany nodded, pulling me down. “Fuck me, Jake. I need my brother’s cock inside me.”
I thrust in slowly, savoring how tight and hot her virgin pussy felt. She cried out, nails digging into my back. Inch by inch I filled her until I was buried to the balls in my shy little sister. We started moving together — slow, deep strokes that built quickly.
The bed creaked as I fucked her harder. Bethany’s tits bounced with every thrust. Her moans filled the room: “Harder, brother! Fuck your shy sister! Make me your slut!”
I flipped her onto all fours, pounding her from behind while slapping her ass. She pushed back, eager now. Another orgasm built. This time when she came, she squirted all over my cock and down her thighs, soaking everything. The sight pushed me over the edge. I groaned and filled her pussy with thick ropes of cum, breeding my sister deep.
We collapsed together, panting. But Bethany wasn’t done. Throughout the night we fucked again and again — in her bed, in the shower where she posed nude for me again, soapy and dripping, and once more on the couch downstairs where the party had been.
She rode me reverse cowgirl, her ass bouncing as she took control, squirting every time she came. By morning, my shy sister was transformed. She posed for private photos just for me — legs spread, fingers in her cum-filled pussy, smiling shyly yet seductively.
“I want this again, Jake,” she whispered as the sun rose. “I want to be your secret squirting sister slut.”
From that night on, our taboo games continued. Every time our parents were away, Bethany would “pose nude” for me — sometimes recreating the wet T-shirt moment in the backyard, sometimes playing new party games that always ended with her gushing all over my cock.
My shy sister Bethany had discovered her wild side, and I was the lucky brother who got to enjoy every dripping, squirting, incestuous second of it.
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