Jeff and Jamie sat side by side, the sister guiding the brother to massage her breast for several moments. After a pause, Jeff reached his other arm down, slid it around his sister's waist, and turned her sideways to lean back into him. The weight surprised him slightly; Jamie was a grown woman, not the little slip of a girl who sometimes sat on his lap for short car trips. But she wasn't heavy, and the weight felt good. Jeff had a beautiful, sexually mature, sensuous woman leaning on him, helping him knead her breast.
Jeff put his other hand on his sister's belly and made slow, voluptuous circles around her navel with his palm. Her abs were flat and taut, not hard, but firm, just like her breast. Jamie's hair tickled her brother's chin. Jeff held Jamie in his lap, his hands exploring his sister's suddenly mature body, until he felt his cock getting hard between them.
Jamie reached a hand down as though to brush aside something annoying. When her long, tapering fingers brushed against Jamie's trousers, he gasped. Who would have thought such a light touch could feel so intense? Jamie tried to move her brother's erection for a moment, before she realized her hand was on his fly. Finally she turned around to face her brother, her expression a mix of childish curiosity and grown-up arousal.
"What is that, Jeff?"
"It's my... um, ahem, it's my..." Jeff struggled for a moment, trying to find the right words to discuss his boner with his own sister. Her lips quivered as she waited for his answer. Her small, dark, girl's lips, right above her short childish neck that connected to a deep, womanly clavicle. A woman's shoulders. The plunging neckline of her dress revealing her brown cleavage, unmarred, he realized for the first time, by a tan line. So much woman, literally in the palm of his hand.
"Oh, Jamie," he whispered, and she forgot everything as she swept her brother up in a tight embrace, pressing her full breasts into his body. He held her close, pulled her hair back from her ear, and whispered, "Will you come to bed with me?"
The instructions he'd written earlier, that Jamie would comply with her brother's sexual requests, and her brother's alone, kicked in. She smiled and pressed a quick kiss onto his cheek. "I would love that, Jeff. Can we go right now?"
"Yes," Jeff said, already helping his sister to stand from his lap. Once she was standing, she took both her brother's hands in hers (so long and warm, her grown-up hands, like a bird's wings!) and pulled him to his feet. Never letting Jeff's hands go, she walked backward, leading him back toward his bedroom.
Just inside his room, Jeff stopped. He pushed the door closed, then grabbed his sister by her waist, pushed her up against the door, and held her by the hips as he kissed her. Jamie's lips were small, but warm and soft and willing, returning her brother's kiss. She cupped her face and held him close, while he ran his hands up and down the length of her body. She trembled as her brother's hands moved from her waist to her belly, to her breasts and shoulders.
"Your touch feels so good, Jeff," she whispered, her lips and voice roughened from her brother's kiss.
"You taste like a peach, Jamie," he answered.
She pushed off the door and hugged her brother so fiercely that he stumbled backward, and would've fallen on the floor, if his bed hadn't been there to catch him. He landed flat on his back, his legs dangling over the edge, with his grown-up sister's weight on top of him, her arms still grasping his body, her breasts practically at his throat. He thought he could have died a happy man.
But he wouldn't have been a man. Not a real man, not yet.
Jeff grasped his sister by her hips and rolled them over so he was on top, and they were both up on his bed. The motion twisted Jamie's skirt around her so that it ruched up almost enough to expose her underwear. Jeff looked at his all-grown-up baby sister underneath him. He loved her in that moment, completely and absolutely, a love so intense that he couldn't separate it from his longing for her enhanced, mature body.
"I want to give you my virginity," Jeff said.
"I want to give you mine, " Jamie replied.
But as he kissed and caressed his sister's body, Jeff felt something still wasn't completely right. Without breaking contact, he retrieved the Chronivac controls from his pocket, and made one quick change.