As they pulled away from their special spot and headed towards the old highway, Lee kept looking over herself in amazement.
"Hey..." She whispered, holding out her right hand palm out. "Give me your hand."
Steve complied, and did a double take as he saw Lee's lithe dainty fingers now covered more of his hand in hers. The reality began to set in again and they both smiled and giggled.
"This, I like." She said, marvelling at her increased perspective and taller body. "I feel so different."
As Steve drove on, he kept stealing glances at Lee and growing more and more excited. He could really do whatever he wanted to his lovely girlfriend. Anything. What wild experiences they would have now, what weird fetishes he'd get to live out.
"Hmmm..." Lee cocked her head and stared at the tent in her lover's pants. "Thinking of what you're going to do to me?"
"Huh?" Steve snapped out of his daze. "Uh..." He blushed deeply. "Yeah."
Lee grinned slyly again and reached a larger hand over the seat to touch Steve's boner. He gulped, squirmed, and shifted slightly as his pants grew even tighter.
"So, all of me's a little bigger..." She said, leaning over and unbuttoning his worn jeans. "I bet I can take more of you in my mouth now."
"Jesus, Lee!" Steve's eyes went wide, his blush deepening. "I'm driving!"
"So?" She said. "I don't see you stopping me." Her skilled hands unzipped his fly and caressed the bulge in his underwear, causing it to grow a little firmer still.
"No, ma'am." He sighed happily.
Lee freed her lover's cock as he drove. Thick, but not painfully so. Sizeable enough to make her a little uncomfortable at first, but not the largest she'd ever had. Steve watched, shocked, as she easily leaned over from her seat, over the console, and began eagerly licking him with a slightly larger but still very flexible tongue.
As she traced her long tongue up and down his shaft he began to leak pre, also swerving dangerously over the shoulder once. When she opened her plump kissable lips and closed her mouth over his tip, he moaned and jumped. And when she took all but an inch and a bit of his length into her mouth, he grinned.
She was indeed able to take quite a bit more of him in as she began sucking and slurping eagerly. Lee was very very good with her mouth, and soon Steve was sweating and moaning as he drove, his larger girlfriend expertly pleasing him. He placed a hand on the back of her head, running his fingers through her rich black hair, and felt himself starting to go into orgasm.
Lee had different ideas. She quickly grabbed the base of his shaft and squeezed it tightly in her hand, removing her mouth and teasing him immensely. "Uh-uh..." She shook her head, licking the near-ejaculate from his tip. "Not yet, sir. Wait until we get home."
She gingerly buttoned him back up, chuckling at his mock cry of offense, and sat back up in her seat, smiling innocently.
"You're evil." Steve said, shifting in his seat uncomfortably.
"You knew that already." Lee grinned, and leaned back, proud of herself.
It was a long ride back to town.