Twin Brother Discovers His Desire for Transgender Sister’s Huge Cock

Willow stood in the doorway of the bathroom in nothing but a pair of white ankle socks and a sheer pink petticoat that barely reached the tops of her thighs. The layered ruffles framed the heavy, half-hard cock that hung between her legs, thick and veined, the foreskin still half-covering the glistening head. She was twenty-two, same as her twin brother, and she had never once tried to hide what she was. Their parents had raised them both without secrets. Willow had been on hormones since she was fifteen, soft curves and long lashes, but the doctors had left her the one thing she refused to give up: the oversized cock that made every pair of panties look ridiculous.

“Close the door or come in, Alex,” she said without looking up from the mirror. She was brushing out the long brown hair she wore in two high pigtails tied with matching pink ribbons. “You’re letting the steam out.”

Alex had meant to grab a towel and leave. Instead he stood there, pulse hammering, watching the way the petticoat shifted every time she moved. He’d seen her naked a hundred times growing up—twins shared a bathroom until college—but something had changed since they both moved back into the family house for the summer. Or maybe something had changed in him.

He stepped inside and shut the door.

Willow’s eyes met his in the mirror. A small, knowing smile touched her glossed lips. “You can look. It’s not like you haven’t before.”

“I wasn’t looking,” he lied.

She turned, the petticoat flaring, and the full weight of her cock swung free. Soft it was already longer than his hard. Fully hard, Alex knew from stolen glances over the years, it was a monster—thick enough that her fingers barely met when she stroked it, long enough to rest against her navel when she stood up straight. She reached down and casually lifted it, letting the heavy shaft rest across her palm so he could see the underside, the thick vein that ran the length of it, the smooth, hairless balls that hung beneath.

“You always stare at it like you’re mad at it,” she said. “Or like you want to put it in your mouth.”

Alex’s face burned. “Jesus, Willow.”

“Relax.” She let it drop. The tip slapped gently against her thigh. “I’m teasing. Mostly.” She went back to the mirror, retying one of the pigtails. “Mom said you’re going out tonight. With those guys from the gym?”

“Yeah. Some bar. Maybe a club after.”

“Have fun. Try not to spend all your money on hookers again.”

He froze. “What?”

Willow laughed, soft and low. “The receipt was in the trash, dummy. ‘Elite Companions.’ Two girls. You must’ve been lonely.” She glanced at him over her shoulder. “Did they let you come in their mouths?”

Alex’s cock twitched hard against his jeans. He should have left. Instead he heard himself say, “One of them did. The other one wanted me to watch while she… while her friend ate it out of her.”

Willow’s hand stilled on the ribbon. For a second the only sound was the drip of the faucet. Then she turned fully, petticoat brushing the tops of her stockings, and leaned back against the sink. Her cock had begun to thicken, the head pushing free of the foreskin.

“Tell me,” she said. “All of it.”

So he did.

He told her about the two girls, both in their mid-twenties, one blonde and one redhead, how they’d taken turns on his cock in the hotel room. How the blonde had sucked him deep while the redhead whispered filthy things in his ear—stories about the men she fucked for money, how she made them watch while other guys used her, how she loved the taste of cum when she licked it out of another girl’s cunt. How, when he finally came, the blonde had held it on her tongue and then kissed the redhead, sharing it, both of them moaning like it was the best thing they’d tasted all night. He told her how hard he’d gotten again just watching them swallow.

Willow’s breathing had gone shallow. Her cock was fully hard now, curving up, the head shiny and dark. She wrapped one hand around the base and stroked once, slow.

“You liked watching them eat it,” she said. It wasn’t a question.

Alex nodded, throat dry. “Yeah.”

“Come here.”

He took one step, then another, until he was close enough to smell her vanilla lotion and the faint musk underneath. Willow reached out with her free hand, hooked two fingers into his waistband, and pulled him the rest of the way. The head of her cock brushed the front of his jeans, leaving a wet streak.

“I’ve been underappreciated my whole life,” she murmured. “All this cock and nobody who wants to really use it. Or be used by it.” Her thumb rubbed over the slit, gathering the clear bead of precum. She lifted it to his mouth. “Open.”

Alex’s lips parted before he could think. The taste was salt and skin and something sweeter. Willow watched his face as she fed him the rest of it, then guided his hand down to wrap around her shaft. His fingers didn’t meet.

“Stroke it,” she said. “Slow. Like you mean it.”

He did. The heat of her pulsed in his palm. Willow’s free hand slid into his hair, not quite pushing, just resting there, while she told him, in that same calm voice, about the modeling shoots she’d done last year. Soft-core at first, then harder. How one photographer had her strip down to the petticoat and pigtails and pose with a bottle of lube between her thighs, the cock framed perfectly for the camera. How the makeup artist had been a guy who kept staring, and how Willow had finally let him suck her off in the dressing room while she scrolled through cuckold stories on her phone—men writing about their wives bringing home strangers, about being forced to clean up afterward, about tasting another man’s cum from their wife’s cunt or from the condom after. She’d read the filthiest ones out loud while the makeup guy swallowed everything she gave him.

“I came so hard,” she said, hips rocking into Alex’s fist. “All over his face. He licked it up. Every drop.”

Alex was rock hard in his jeans. Willow noticed. She let go of his hair long enough to open his fly, shove his jeans and boxers down, and free him. His cock looked small next to hers. She didn’t comment. She just spat in her palm and started stroking him in the same slow rhythm he was using on her.

“Keep talking,” she ordered. “Tell me more about the hookers. Did either of them let you fuck their ass?”

“The redhead,” he managed. “She said she liked it rough. I came inside her. She made me pull out so she could push it out into the blonde’s mouth.”

Willow’s grip tightened. “Fuck. That’s hot.” Her hips moved faster. “You want to taste mine, don’t you? You’ve been thinking about it for years.”

He didn’t answer. He didn’t have to. Willow pulled him down by the hair until he was on his knees on the bath mat, face level with the thick cock he’d been stroking. She tapped the head against his lips.

“Open wide, little brother.”

He did.

The stretch was immediate. She was thicker than anything he’d ever had in his mouth. Willow didn’t force it; she let him set the pace at first, one hand resting on the back of his head while the other held the base. The taste was stronger than the precum—clean skin, salt, the faint chemical tang of the hormones she took every morning. Alex’s jaw ached within a minute. He didn’t stop.

“That’s it,” Willow breathed. “Look up at me. I want to see your eyes while you suck your sister’s cock.”

He looked up. The pigtails framed her face. The petticoat rustled against his forehead every time she rocked forward. She started talking again—dirty, steady—about the strip search fantasy she’d had since she was nineteen. How she wanted to be “caught” with something she shouldn’t have, made to bend over, petticoat flipped up, while someone in a uniform ran their hands over every inch of her. How she’d want them to find the cock, to be shocked, and then to make her earn her way out of trouble by swallowing whatever they gave her. How she’d fantasized about Alex being the one to “search” her, to push two fingers into her ass while she sucked him, then to make her hold a bottle of water between her thighs and walk around the house like that until she begged.

Alex moaned around her. The vibration made Willow’s thighs tremble.

“Good boy,” she whispered. “You’re gonna swallow it when I come. Every drop. Just like those hookers did for you.”

She started thrusting, shallow at first, then deeper. Alex’s eyes watered. Spit ran down his chin and dripped onto the bath mat. Willow’s hand tightened in his hair, holding him in place while she fucked his mouth. The head of her cock bumped the back of his throat over and over. He gagged once, twice, but didn’t pull off.

“Fuck—Alex—”

She came with a low, broken sound. Thick pulses of cum flooded his mouth. He swallowed as fast as he could, throat working, but there was so much. Some leaked from the corners of his lips and ran down his neck. Willow held him there until the last twitch faded, then slowly pulled out. A final string of cum and spit connected the head of her cock to his lower lip before it broke.

Alex stayed on his knees, breathing hard, lips shiny. Willow stroked his hair once, almost gentle, then reached down and wrapped her hand around his neglected cock. Two strokes and he was coming, hips jerking, painting her fingers and the front of her petticoat.

She lifted her hand to his mouth. “Clean it.”

He did, licking his own cum off her fingers while she watched. When he finished she pulled him up, kissed him once—slow, tasting herself on his tongue—and then stepped back.

“Go shower,” she said, voice a little unsteady. “And if you still want more later… you know where my room is.”

Alex nodded. His knees felt weak. In the mirror he could see the wet spot on the front of her petticoat and the way her cock, still half-hard, hung heavy between her thighs.

He already knew he’d be back.

That night he didn’t go out.

He stayed in his room until almost midnight, then padded down the hall in just his boxers. Willow’s door was cracked. Soft light spilled out. He pushed it open.

She was on the bed in the same petticoat and pigtails, nothing else. A half-empty water bottle sat on the nightstand. Her phone was in one hand; the other rested on her cock, which was hard again, resting against her stomach.

“Couldn’t sleep,” she said. She didn’t sound surprised. “Come here.”

He crawled onto the bed. Willow set the phone aside and guided him down until his head was in her lap. She fed him her cock again, slower this time, one hand stroking his hair while she scrolled through something on her phone with the other.

“Listen,” she said.

She started reading. Cuckold stories. Graphic ones. A man describing how his wife made him kneel and eat the cum out of her after she’d been fucked by two strangers. Another about a guy who had to clean his wife’s boyfriend’s cock with his mouth after every session. Willow’s voice stayed calm, almost bored, but her hips kept giving tiny thrusts, pushing deeper into Alex’s throat each time the stories got filthier.

When she finished one particularly nasty paragraph she set the phone down and reached for the water bottle. She took a long drink, then held it out to him.

“Hold this between your thighs,” she said. “Don’t drop it.”

Alex shifted, confused, until she guided the bottle between his legs, pressing it up against his balls. The plastic was cold. He clenched his thighs to keep it there while she went back to fucking his mouth.

“Good. Now you’re gonna stay like that until I come again. And when I do, you’re gonna swallow every drop, then you’re gonna drink the rest of the water. Understand?”

He nodded as best he could with her cock stretching his lips.

Willow lasted longer the second time. She made him edge himself with one hand while he sucked her, told him not to come until she said so. She described, in detail, the modeling shoot where the photographer had her pose with a strap-on in her mouth and her own cock out, how the whole crew had watched her stroke herself until she came on the studio floor. How one of the female models had gotten on her knees afterward and licked it up while Willow held her hair.

“I wanted it to be you,” she admitted, voice tight. “I’ve wanted it to be you for a long time.”

Alex came first, spilling over his own fist and the bottle between his thighs. Willow followed seconds later, flooding his mouth again. He swallowed, choked, swallowed more. When she finally pulled out she took the bottle from between his legs, unscrewed the cap, and held it to his lips.

“Drink.”

He did. The water was warm from his skin. When the bottle was empty she kissed him again, deeper this time, and then pulled him up the bed until they were face to face.

“Stay,” she said.

He stayed.

In the morning the petticoat was on the floor and the pigtails were half undone. Willow’s cock was soft against his hip, heavy and warm. Alex woke with the taste of her still in his mouth and the knowledge that he was never going to be able to look at his sister the same way again.

He didn’t want to.