"I'm trying."
"Oh God, what is it?" As if she didn't know.
"Well I can't help it, what with we we were saying."
"Oh."
Silence.
Karl felt even more tense as a result. The silence was driving him to distraction.
"I just felt really wound up just now."
"I can tell." There was another half minute of silence. Lucy then gave a deep sigh and got out of bed, walking over towards Karl. He could scarcely believe it.
"Look, we have to be really really quiet."
He could hear this, but was barely able to compute. Lucy then clambered onto the bed, and sat over Karl -- he could make her out above him in the very dim light.
"Just kissing, ok?"
"Oh..Ok."
Lucy bent over towards Karl, and kissed him first on the cheek, then on the lips. He felt her warm breath on him, and her lips on his. He open his slightly, and Lucy slipped her tongue into his mouth. His tongue met hers, and suddenly he felt on fire. Just as well that there was a duvet between them he thought. He touched her shoulders, clad in her shirt, and released her from the kiss before pressing his lips onto hers again.
"Oh Lucy, this feels so good."
"I know."
His fingers ran down her arms. He could feel her small breasts pressing into his chest, the fabric unable to conceal the hardness in her nipples. Karl knew she was aroused. He wanted to kiss her breasts, to pull up her shirt, and take off her panties, but it would be taking things far too far for Lucy. He was aware of of his own erection, poking upwards into the duvet. If he shifted slightly he reckoned that Lucy could feel it. For some devilish reason he wanted Lucy to feel his erection, jutting up towards her. Lucy planted another kiss on his lips and he melted as her tongue found it way into his mouth and played with his tongue again, flicking and darting in a sexual game of dare.
He loved it, and wanted more, flicking back with his tongue against hers, he began to pull down the duvet. Lucy moved herself to one side and raised herself up, as the duvet was pulled down. She got alongside Karl quickly whilst still in mid kiss, Karl pulled the duvet further down with one arm, the other arm around his sister's back. She then rose up and broke the kiss before moving a leg over Karl and getting on top of him and straddling him.
"Ha!" she whispered. "Got you."
Karl could feel Lucy's heat emanating from her groin as she sat over his abdomen. His cock was mast erect. Would she touch him? He ached for her to do so. He wished she would inch back and feel his cock on her ass, then take her hands to him, massage him, and then lower herself onto him. It was dark but such was the desire he could almost see Lucy perched over him rocking on him, sliding up and down on him, fucking him, such was the strength of vision. He'd been here before though. And they'd stopped.
"Oh Luce."
Silence.
What did he need to do? ....But of course, they couldn't.
Suddenly his thoughts were interrupted. He felt something down below. His crazed vision? No, something was very, very, lightly touching him down there. He was being grasped lightly by delicate fingers. He pushed his head back into the pillow to let the sensations take over. The gentle pulling on his cock intensified a little. It was like dreaming, was Lucy really doing this to him? He did not dare breathe a word. He felt the heat of her thighs over his middle and the slight swaying she made as she reached and toyed with him.
Slowly and steadily her fingers grasped a little more and thrust up and down his shaft. The warmth of their hold was coupled with the gentle pulling up and down. Then a stroking of his balls - oh it was heavenly - and the insistent gently pulling up and down on his shaft. Where had she learnt that?
She increased her speed a little and then slowed again. Oh, the minx! If only he could see more, but what he couldn't see was made up by sheer feeling. Then Lucy slid her fingers round his hardness and pulled and teased a little harder. He could feel the tension mount in him, and he stiffened his body as her hand steadily pulled and teased at him. Then there was another caress of his balls and he felt ready to explode.
Lucy had never touched him before, and now she was pulling at his shaft, ever more vigorously, encouraging him to come. She spoke not a word, all her communication was through her fingers sending fireworks of pleasure through him. The vision of Lucy, bending over, revealing her pussy shot through him, and suddenly he could feel his orgasm approaching and stifled a moan, her hands slid up and down and finally rubbed his balls gently once more to let him finally release their load and he shot out his cum into her welcoming palm. She stopped momentarily, and then bent over to kiss him again passionately on the lips. Carefully, and quietly, she dismounted him and slid out of the bed and went over to her own. With his mind numb from pleasure, he faintly heard her covers being pulled over and Lucy settling down to sleep; with passion satiated, he felt a drowsiness envelope him. Whatever had just happened he could deal with in the morning.