It isn't long before you move from heavy petting to full-on sex. With the changes the two of you have undergone, it's wilder than ever. You have more stamina and you're both much more limber and flexible. You're having such a great time you're not even bothered that your girlfriend wanted to up your penis size a couple inches.
After climax, you both settle down into the bed, face to face. You gently try to slip your member out of her, but find it's not willing to move. It's still throbbing in the tight passage and you know forcing it out will hurt.
"Guess I shouldn't have made you quite so small, babe," you say.
"Actually," she says in a low voice, "that was me. I shrank my pussy just after orgasm."
"Why?"
"Because I'm not ready to let you go yet," she smiles. She puts her arms around you and rests her head against your smooth chest. You gently brush hair out of both of your faces and admire her little face. She looks beautifully serene.
You lay together for a bit until your penis finally calms down enough for you to slide it out. She doesn't make her pussy tighter to stop you.
As the night grows deeper, you're both settled in under the covers, spooning, your taller body cupping around hers. You've draped your long hair over either side of the bed to keep it out of the way.
As you caress her sleeping form, you still can't shake the amazement of what you both have been through...and you're eager to see what the rest of the vacation is going to be like.