Desire
The tip of Lisa's tongue moved down the length of Brad's cock, then immediately back up, teasing him. She twirled her tongue around its head a few times, then descended on it with her entire mouth, surrounding him with wet fire. Brad sucked air in through his teeth, muffling his appreciation, fighting back the urge to moan.
His little sister was just down the hall. He couldn't let her hear him.
Lisa had always given good head. It was a shame she'd decided she preferred girls as lovers. She covered Brad's cock with her mouth, running energetically up and down his length with her lips, then taking his cockhead and sucking it furiously as her hand stroked him just as vigorously. Brad felt no guilt, as far as Lisa was concerned, by imagining that Cassie was the one sucking him off. Lisa didn't care.
Brad and Lisa had been steady lovers, once, two summers ago. It hadn't lasted long. That was when Lisa had decided she was more interested in girls. At first he'd thought he was in for a summer of amazing sex whenever he wanted it. Everyone knew Lisa was a wild one. Two weeks into their affair he got the "it's not you, it's me" line, but in a way he'd never expected.
Since then she had only shown serious interest in women, although she liked sex too much to completely pass on men. At least, she didn't find them revolting.
This was a pity blow job. Brad had suffered through four weeks so far this summer without so much as a kiss from a girl.
They were in his room at his family's summer home, at a secluded lake far north in Minnesota. When they were younger it had been great fun. Their families came here every year for weekends or weeks at a time. There were a lot of others their age around then, all in vacation houses scattered around the lake. Everyone hung out all day, swimming, sailing, sunning. As the summer wore on they would pair off, boys and girls, different couples every summer. They had their flings and their fights and their drama, along with a growing awareness of sex.
Now they were older. Brad was entering his third year of college, Lisa her last. Cassie had just finished her first. Most of their usual friends hadn't even come to the lake this year, or last. They showed up sometimes for weekends, but mostly they stayed home to work, or traveled to Europe.
For Brad, Lisa and Cassie, though, their own families had insisted they do this, that they enjoy one last summer without responsibility. They had a whole lifetime to work, they were told. They might never have an entire summer off again, until they retired in fifty years.
Brad supposed he should be grateful, but he knew his old high school friends were all at home together. They were partying at night and on weekends. They were meeting girls. They were having more adult fun, even if they had to put in long, boring days behind a cash register or stocking shelves.
Here, there was no one to meet. There was only Lisa, and Cassie.
"It's okay with me if you imagine that I'm Cassie," Lisa said. Startled by the comment, Brad looked down to see her blue eyes twinkling mischievously at him. She wore a sly grin, then went back to kissing his cock. She slapped it against her face, as if trying to wake it up. He realized with embarrassment that he'd let his mind wander so much he hadn't entirely kept his erection.
"Just imagine Cassie's hot little mouth sucking your dick, Brad. Imagine how tight her tiny, little lips would feel around your cock."
With that, Lisa descended on him again, taking him as deeply into her throat as she could. She squeezed his cock aggressively with her hand and lips, seemingly trying to simulate the feel of Cassie's own petite mouth.
Lisa had been teasing him about Cassie for weeks.
It was only a few days into the summer when Lisa had asked if he'd mind if she went after Cassie. She thought Cassie was hot, and Lisa couldn't stay celibate all summer. And all the other girls were already taken, by guys.
At first Brad was stunned, but he didn't think he had any right to refuse. He didn't even think Lisa should have asked his permission, though he was glad she had. It meant their friendship was still important to her.
Brad was also sure that naive, inexperienced, young Cassie would refuse her. He was shocked at how quickly Cassie had succumbed. All it had taken was a couple of beers, a late night sitting at the lake, and suddenly Cassie and Lisa were making out, then Lisa had her hand up Cassie's shirt, and finally Cassie was moaning and squealing like a whore.
Brad himself didn't have any love options left. There were so few people at the lake this year. Everyone that was available had already paired up. Brad was soon the odd man out. The last two women left were Lisa and Cassie, both of them sexy, beautiful and unavailable. He couldn't have either, Lisa because she was his friend, and she was interested only in women, and Cassie because she was his little sister.
But then Lisa had made things worse. She had started to play games with Brad. She kissed and fucked Cassie whenever she knew Brad was around and could hear them. When they were alone, sometimes even when Cassie might hear her, she'd tell Brad what a hot little fuck his sister was. She'd go into detail, telling him about how she kissed, or how hot her pussy felt and tasted, and mostly about the wonderful noises she made when she came.
Brad had heard enough of that himself to know she wasn't lying. Lisa didn't hesitate to make Cassie come when she knew Brad was in earshot. She'd been doing it all month. Brad had heard Cassie screaming and squealing in ecstasy any number of times by now. It seemed that Lisa could almost make Cassie come just by looking at her.
Unfortunately for Brad, listening to Cassie have an orgasm was the most erotic, amazing and musical sound he had ever heard. She squealed and breathed and screamed in the best little whore soprano he'd ever imagined. He got an erection every time he heard her. He always knew he should wander away, to give them their privacy, but he always sat and listened, getting harder with every sound she made.
Brad's cock was rock hard again, now, as Lisa energetically devoured him. He could feel himself getting ready to come. Thinking about Cassie always turned him on. He almost couldn't look at his baby sister anymore without feeling aroused, now that Lisa had shown him how hot she was. He constantly pictured her when he masturbated. He heard her in his mind, coming for him. He imagined squeezing her tiny little tits, or watching them jiggle as she rode him.
And here Lisa was, guessing at and playing to his fantasies, playing Cassie for him with her mouth on his cock.
