Suddenly Caitlyn Flynn didn't have anything to do for the evening. Her boyfriend Scott's buddy scored two last minute tickets to the Dani Murphy gig, sold out for months at any reasonable price. Both he and Scott had been huge fans for years. Caitlin had never gotten into the music, but she didn't blame Scott for breaking off their fourth date and going. The downside was she didn't have a lot else to do for the evening. Her other friends were al either busy, or on vacation alone or with families - Caitlin herself wasn't as she hadn't fancied going over to Europe with Mom, Dad, Uncle Declan and Cousin Lily. She didn't like herself for doing so, but she found it hard work being around Lily, poor girl. Still, they were all in Europe and she was theoretically free to spend more time around the boy she liked. She walked home alone from Scott's house.
As she turned the corner to the street that held her lifelong home, Caitlin's mind shifted away from vacations and boyfriend. Her house was dark except for up in Conor's room. The window was open and at least one light was on. He'd said he was going out to take some twilight photography that evening, so Caitlin was surprised. He was often out roaming around experimenting with different lights or just getting great shots at parties. She'd had friends comment they hadn't noticed him snapping away, but afterwards he'd share out the best pictures. Even the Jocks gave him an easy time as he handed out shots of them looking cool to impress their girls with. She blushed to think again of her brother, the way he made her feel, and tried to put her mind on other things. At least with him home she could stick her head in and see if he wanted to watch TV or something. Maybe get him to show her his newest photos. She'd be able to look at him while he was distracted, lean in close, 'ironically' ruffle his hair, and even smell him. He could never know how she felt, she knew; it just wasn't right. Quietly, she opened the front door and went inside.
Upstairs Conor Flynn was engaged in one of his hobbies, oblivious to his twin's return home. The thing about being a photography geek, if you aren't a jerk, is that after a while nobody thinks anything of it when you're taking shots. Sometimes they'd notice and pose a little, but often he could catch people in natural poses. He knew dorks who used the freedom to take too-candid photos of any girl (in one case, guy) they could find. Not Conor Flynn. There was only one girl for him, a girl he believed he could never have. If you looked for it, his growing desire showed in his photo portfolio. Caitlin would appear in the background of pictures he was taking as if by chance, until more and more he was snapping his sister as many times as he did anything else. His latest and greatest photo featured Caitlin, oblivious, scratching her inner thigh at a pool party. She'd gone for the cutest black bikini that accentuated her pale skin and contrasted her luxuriant shoulder length red hair.
The hobby that evening wasn't strictly photography. Conor lay naked on his bed. He held the glossy self-developed shot of his sister in one hand and his hard cock in the other. He stroked himself over her pretty smile and luscious body. He knew some girls thought he was kind of a dork, but Caitlin had always been good to him. He knew it was wrong to feel the way he did about Caitlin, but he always assumed his fantasies would remain a secret. The ones where they made love, had a child, lived together as a 'single mother' and her helpful bachelor brother. Adjusting the grip on his cock, he focussed on her face. Conor stroked harder, feeling the pleasure build in his cock as he imagined them rutting together by the pool, her bikini bottoms pushed to one side. Her legs wrapped around him. Her lips on his. His sister. His-
"That's me!"
Caitlin's deeply surprised voice caught him mid-stroke. His twin stood in the bedroom doorway, and Conor hadn't even heard the door open. He would have sworn it was locked, hell, he'd also have sworn nobody else was home. He'd seen her leave for that date with Scott!
"Uh..." he managed.
There was no way she couldn't have seen him holding up her picture as he jerked his hard cock over it. Hell, her statement proved it. His hand froze on his tool as he twisted his head towards Caitlin, and blushed darkly. 'Oh, god', he thought 'why hadn't she knocked?' Embarrassment filled his mind, to be not only caught masturbating over his sister, but also to be caught by his sister! If it had been their Mom, she'd have gone into denial, and his Dad would have been pissed off, felt disgusted and angry, but ultimately wouldn't have let Caitlin know. She would never have found out. Now he might never see her again.
"Ah.." he tried again.
There was a touch of anger in the embarrassment, that she had had burst into his bedroom without knocking. They were both well past 18, far from being children. Caitlin had gone through a phase of bursting in on him on the toilet, and laughing. They'd had to put a lock there too. He twisted around on his bed, covering his cock and the photo with the pillow, and drew breath to make more than noises, to try to justify the unjustifiable.
Caitlin shocked the speech from him again by kicking the door closed behind her. She smiled wickedly at her brother, clasped her hands together, and pressed her arms inwards to plump her cleavage.
"Why the hell would you jerk off over a picture when you could have the real me anytime you wanted, twin bro?"
Caitlin thought the line sounded a little 'adult movie', but it fit what she wanted. There was no nervousness in her voice; just wanton desire. For ages, whenever she played with herself, it was Conor she thought about. She had been with a few guys in a few different ways, from touching to fucking. With all of them she'd found her mind wandering until it was her brother in her hand, her mouth, her snatch. Pretending they wore no condom, that her brother was getting her pregnant. Then she'd come quick and loud and give the guys an undeserved ego boost. Caitlin believed there was a bond twins had that nobody else could understand. They'd shared their Mom's womb, and she wanted to share hers with him too. Inside her panties Caitlin's pussy grew wet, her labia swelled and opened slightly, as she ran her eyes down Conor's torso to where his thick, but not too long, circumcised cock was hidden by the pillow. She'd still had a good look before he covered it. She felt lucky the other girls hadn't found out about that. Geek or no, there were some who would have been all over it. He'd grown since those toilet prank days. Her nipples had hardened inside her bra.
Conor couldn't find the words. His rising anger had vanished as quickly as it formed, and his intense arousal as Caitlin slinked towards him was almost too much to bear. He never considered she might be pranking him. There was too much raw need in her eyes. Any lingering moral doubts he held over wanting to fuck his sister burned away in the gaze of her smouldering eyes. Conor moved the pillow back up the bed and stood up. Let her see him all. His cock had re-erected quickly and left him with an ache in his balls. He thought he was going to spurt then and there, but he finally found the words he needed to ask,
"Are... you sure you want to...?"
"Totally sure. I want you more than anything, Right here. Tonight. And you? You want to... your first time? All the way? With your sister? We're so perverted. Right?" Caitlin's words came out in a rush.
Conor nodded, managed to breathe "Yes."
Caitlin winked, and unbuttoned. She'd imagined stripping for him so many times, but usually with Conor coming onto her first. She dropped her blouse slowly to the floor and gave another little. Then she reached back to the bra catch and bared herself before her brother's gaze. Her bra landed on the floor, beside the blouse, both immediately forgotten. All strip, no tease. Caitlin's nipples stuck out hard from her flushed breasts, signalling her deep arousal. Conor wanted to take them into his mouth and taste them, massage them with his hands. He'd never had the chance to fondle a real breast. The bikini picture fluttered from his fingers.
Before he had the chance to reach for his sister, Caitlin sank to her knees and took Conor's cock into her mouth. Unsure what to do with his hands, he held them awkwardly to the sides, and then stroked Caitlin's soft red hair. Funny how guys had joked about him being ginger, but Caitlin's was the same shade. As her lips closed around his shaft, Conor's knees trembled with excitement. He had to lean partly on Caitlin's shoulders to stay standing. She moaned around his cock and looked up to meet his eyes. Both brother and sister knew that Conor wouldn't last long; he'd been close to blowing his load over Caitlin's picture even before she came in. Caitlin licked around the head of her brother's hard cock, and gently teased it with her teeth. She pulled off and kissed the crown, then swallowed again.
"Cait! That's... oh...!"
Caitlin pushed a hand into her pants, slid into her pink panties. She was dripping almost as much as if she'd wet herself. The pleasure she derived from knowing it was her own brother's thick shaft between her lips was almost as great as the pleasure she took from rubbing herself. She pinched a nipple with her other hand. Conor's twitching cock reached the back of her throat. She swallowed it expertly, the zany sword swallowing class she'd taken the previous summer having trained her gag reflex more than her boyfriends. She swallowed his length with ease.
"That feels so good! Oh shit, sis... you're amazing!"
It was a new surprise on a night of surprises for Conor as more and more of his cock disappeared between his sister's subtly painted lips. He had an idea from the school locker rooms that he was a decent size. He knew he was bigger than poor Jake, and even Moose. Why did every school have a moose? In the porn he'd seen there were guys with cocks of similar or smaller width though they tended to be longer. He'd thought maybe he'd never meet a girl who'd take his in her mouth, let alone swallow it all. Caitlin's face pressed into his ginger bush. His twin sister's lovely eyes looked up at him, pale green, focussed. He was about to come. He could feel his cock twitching, and the familiar sensation of approaching climax in his balls, but far more intense than from whacking off. He was going to come a lot. His balls tightened up at the base of his shaft.